--- /dev/null
+/* Asynchronous subprocess implementation for UNIX
+ Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995
+ Free Software Foundation, Inc.
+ Copyright (C) 1995 Sun Microsystems, Inc.
+ Copyright (C) 1995, 1996 Ben Wing.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* This file has been Mule-ized except for `start-process-internal',
+ `open-network-stream-internal' and `open-multicast-group-internal'. */
+
+/* This file has been split into process.c and process-unix.c by
+ Kirill M. Katsnelson <kkm@kis.ru>, so please bash him and not
+ the original author(s) */
+
+/* The IPv6 support is derived from the code for GNU Emacs-20.3
+ written by Wolfgang S. Rupprecht */
+
+#include <config.h>
+
+#if !defined (NO_SUBPROCESSES)
+
+/* The entire file is within this conditional */
+
+#include "lisp.h"
+
+#include "buffer.h"
+#include "events.h"
+#include "frame.h"
+#include "hash.h"
+#include "lstream.h"
+#include "opaque.h"
+#include "process.h"
+#include "procimpl.h"
+#include "sysdep.h"
+#include "window.h"
+#ifdef FILE_CODING
+#include "file-coding.h"
+#endif
+
+#include <setjmp.h>
+#include "sysfile.h"
+#include "sysproc.h"
+#include "systime.h"
+#include "syssignal.h" /* Always include before systty.h */
+#include "systty.h"
+#include "syswait.h"
+
+#ifdef HPUX
+#include <grp.h> /* See grantpt fixups for HPUX below. */
+#endif
+
+/*
+ * Implementation-specific data. Pointed to by Lisp_Process->process_data
+ */
+
+struct unix_process_data
+{
+ /* Non-0 if this is really a ToolTalk channel. */
+ int connected_via_filedesc_p;
+ /* Descriptor by which we read from this process. -1 for dead process */
+ int infd;
+ /* Descriptor for the tty which this process is using.
+ -1 if we didn't record it (on some systems, there's no need). */
+ int subtty;
+ /* Name of subprocess terminal. */
+ Lisp_Object tty_name;
+ /* Non-false if communicating through a pty. */
+ char pty_flag;
+};
+
+#define UNIX_DATA(p) ((struct unix_process_data*)((p)->process_data))
+
+
+\f
+/**********************************************************************/
+/* Static helper routines */
+/**********************************************************************/
+
+static SIGTYPE
+close_safely_handler (int signo)
+{
+ EMACS_REESTABLISH_SIGNAL (signo, close_safely_handler);
+ SIGRETURN;
+}
+
+static void
+close_safely (int fd)
+{
+ stop_interrupts ();
+ signal (SIGALRM, close_safely_handler);
+ alarm (1);
+ close (fd);
+ alarm (0);
+ start_interrupts ();
+}
+
+static void
+close_descriptor_pair (int in, int out)
+{
+ if (in >= 0)
+ close (in);
+ if (out != in && out >= 0)
+ close (out);
+}
+
+/* Close all descriptors currently in use for communication
+ with subprocess. This is used in a newly-forked subprocess
+ to get rid of irrelevant descriptors. */
+
+static int
+close_process_descs_mapfun (const void* key, void* contents, void* arg)
+{
+ Lisp_Object proc;
+ CVOID_TO_LISP (proc, contents);
+ event_stream_delete_stream_pair (XPROCESS(proc)->pipe_instream,
+ XPROCESS(proc)->pipe_outstream);
+ return 0;
+}
+
+/* #### This function is currently called from child_setup
+ in callproc.c. It should become static though - kkm */
+void
+close_process_descs (void)
+{
+ maphash (close_process_descs_mapfun, usid_to_process, 0);
+}
+
+/* connect to an existing file descriptor. This is very similar to
+ open-network-stream except that it assumes that the connection has
+ already been initialized. It is currently used for ToolTalk
+ communication. */
+
+/* This function used to be visible on the Lisp level, but there is no
+ real point in doing that. Here is the doc string:
+
+ "Connect to an existing file descriptor.
+Return a subprocess-object to represent the connection.
+Input and output work as for subprocesses; `delete-process' closes it.
+Args are NAME BUFFER INFD OUTFD.
+NAME is name for process. It is modified if necessary to make it unique.
+BUFFER is the buffer (or buffer-name) to associate with the process.
+ Process output goes at end of that buffer, unless you specify
+ an output stream or filter function to handle the output.
+ BUFFER may also be nil, meaning that this process is not associated
+ with any buffer.
+INFD and OUTFD specify the file descriptors to use for input and
+ output, respectively."
+*/
+
+Lisp_Object
+connect_to_file_descriptor (Lisp_Object name, Lisp_Object buffer,
+ Lisp_Object infd, Lisp_Object outfd)
+{
+ /* This function can GC */
+ Lisp_Object proc;
+ int inch;
+
+ CHECK_STRING (name);
+ CHECK_INT (infd);
+ CHECK_INT (outfd);
+
+ inch = XINT (infd);
+ if (get_process_from_usid (FD_TO_USID (inch)))
+ invalid_operation ("There is already a process connected to fd", infd);
+ if (!NILP (buffer))
+ buffer = Fget_buffer_create (buffer);
+ proc = make_process_internal (name);
+
+ XPROCESS (proc)->pid = Fcons (infd, name);
+ XPROCESS (proc)->buffer = buffer;
+ init_process_io_handles (XPROCESS (proc), (void*)inch, (void*)XINT (outfd),
+ 0);
+ UNIX_DATA (XPROCESS (proc))->connected_via_filedesc_p = 1;
+
+ event_stream_select_process (XPROCESS (proc));
+
+ return proc;
+}
+
+#ifdef HAVE_PTYS
+static int allocate_pty_the_old_fashioned_way (void);
+
+/* The file name of the (slave) pty opened by allocate_pty(). */
+#ifndef MAX_PTYNAME_LEN
+#define MAX_PTYNAME_LEN 64
+#endif
+static char pty_name[MAX_PTYNAME_LEN];
+
+/* Open an available pty, returning a file descriptor.
+ Return -1 on failure.
+ The file name of the terminal corresponding to the pty
+ is left in the variable `pty_name'. */
+
+static int
+allocate_pty (void)
+{
+ /* Unix98 standardized grantpt, unlockpt, and ptsname, but not the
+ functions required to open a master pty in the first place :-(
+
+ Modern Unix systems all seems to have convenience methods to open
+ a master pty fd in one function call, but there is little
+ agreement on how to do it.
+
+ allocate_pty() tries all the different known easy ways of opening
+ a pty. In case of failure, we resort to the old BSD-style pty
+ grovelling code in allocate_pty_the_old_fashioned_way(). */
+#ifndef FORCE_ALLOCATE_PTY_THE_OLD_FASHIONED_WAY
+ int master_fd = -1;
+ const char *slave_name = NULL;
+ const char *clone = NULL;
+ static const char * const clones[] = /* Different pty master clone devices */
+ {
+ "/dev/ptmx", /* Various systems */
+ "/dev/ptm/clone", /* HPUX */
+ "/dev/ptc", /* AIX */
+ "/dev/ptmx_bsd" /* Tru64 */
+ };
+
+#ifdef HAVE_GETPT /* glibc */
+ master_fd = getpt ();
+ if (master_fd >= 0)
+ goto have_master;
+#endif /* HAVE_GETPT */
+
+
+#if defined(HAVE_OPENPTY) /* BSD, Tru64, glibc */
+ {
+ int slave_fd = -1;
+ int rc;
+ EMACS_BLOCK_SIGNAL (SIGCHLD);
+ rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
+ EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+ if (rc == 0)
+ {
+ slave_name = ttyname (slave_fd);
+ close (slave_fd);
+ goto have_slave_name;
+ }
+ else
+ {
+ if (master_fd >= 0)
+ close (master_fd);
+ if (slave_fd >= 0)
+ close (slave_fd);
+ }
+ }
+#endif /* HAVE_OPENPTY */
+
+#if defined(HAVE__GETPTY) && defined (O_NDELAY) /* SGI */
+ master_fd = -1;
+ EMACS_BLOCK_SIGNAL (SIGCHLD);
+ slave_name = _getpty (&master_fd, O_RDWR | O_NDELAY, 0600, 0);
+ EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+ if (master_fd >= 0 && slave_name != NULL)
+ goto have_slave_name;
+#endif /* HAVE__GETPTY */
+
+ /* Master clone devices are available on most systems */
+ {
+ int i;
+ for (i = 0; i < countof (clones); i++)
+ {
+ clone = clones[i];
+ master_fd = open (clone, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
+ if (master_fd >= 0)
+ goto have_master;
+ }
+ clone = NULL;
+ }
+
+ goto lose;
+
+ have_master:
+
+#if defined (HAVE_PTSNAME)
+ slave_name = ptsname (master_fd);
+ if (slave_name)
+ goto have_slave_name;
+#endif
+
+ /* AIX docs say to use ttyname, not ptsname, to get slave_name */
+ if (clone
+ && !strcmp (clone, "/dev/ptc")
+ && (slave_name = ttyname (master_fd)) != NULL)
+ goto have_slave_name;
+
+ goto lose;
+
+ have_slave_name:
+ strncpy (pty_name, slave_name, sizeof (pty_name));
+ pty_name[sizeof (pty_name) - 1] = '\0';
+ setup_pty (master_fd);
+
+ /* We jump through some hoops to frob the pty.
+ It's not obvious that checking the return code here is useful. */
+
+ /* "The grantpt() function will fail if it is unable to successfully
+ invoke the setuid root program. It may also fail if the
+ application has installed a signal handler to catch SIGCHLD
+ signals." */
+#if defined (HAVE_GRANTPT) || defined (HAVE_UNLOCKPT)
+ EMACS_BLOCK_SIGNAL (SIGCHLD);
+
+#if defined (HAVE_GRANTPT)
+ grantpt (master_fd);
+#ifdef HPUX
+ /* grantpt() behavior on some versions of HP-UX differs from what's
+ specified in the man page: the group of the slave PTY is set to
+ the user's primary group, and we fix that. */
+ {
+ struct group *tty_group = getgrnam ("tty");
+ if (tty_group != NULL)
+ chown (pty_name, (uid_t) -1, tty_group->gr_gid);
+ }
+#endif /* HPUX has broken grantpt() */
+#endif /* HAVE_GRANTPT */
+
+#if defined (HAVE_UNLOCKPT)
+ unlockpt (master_fd);
+#endif
+
+ EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+#endif /* HAVE_GRANTPT || HAVE_UNLOCKPT */
+
+ return master_fd;
+
+ lose:
+ if (master_fd >= 0)
+ close (master_fd);
+#endif /* ndef FORCE_ALLOCATE_PTY_THE_OLD_FASHIONED_WAY */
+ return allocate_pty_the_old_fashioned_way ();
+}
+
+/* This function tries to allocate a pty by iterating through file
+ pairs with names like /dev/ptyp1 and /dev/ttyp1. */
+static int
+allocate_pty_the_old_fashioned_way (void)
+{
+ struct stat stb;
+
+ /* Some systems name their pseudoterminals so that there are gaps in
+ the usual sequence - for example, on HP9000/S700 systems, there
+ are no pseudoterminals with names ending in 'f'. So we wait for
+ three failures in a row before deciding that we've reached the
+ end of the ptys. */
+ int failed_count = 0;
+ int fd;
+ int i;
+ int c;
+
+#ifdef PTY_ITERATION
+ PTY_ITERATION
+#else
+# ifndef FIRST_PTY_LETTER
+# define FIRST_PTY_LETTER 'p'
+# endif
+ for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
+ for (i = 0; i < 16; i++)
+#endif /* PTY_ITERATION */
+
+ {
+#ifdef PTY_NAME_SPRINTF
+ PTY_NAME_SPRINTF
+#else
+ sprintf (pty_name, "/dev/pty%c%x", c, i);
+#endif /* no PTY_NAME_SPRINTF */
+
+ if (xemacs_stat (pty_name, &stb) < 0)
+ {
+ if (++failed_count >= 3)
+ return -1;
+ }
+ else
+ failed_count = 0;
+ fd = open (pty_name, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
+
+ if (fd >= 0)
+ {
+#ifdef PTY_TTY_NAME_SPRINTF
+ PTY_TTY_NAME_SPRINTF
+#else
+ sprintf (pty_name, "/dev/tty%c%x", c, i);
+#endif /* no PTY_TTY_NAME_SPRINTF */
+ if (access (pty_name, R_OK | W_OK) == 0)
+ {
+ setup_pty (fd);
+ return fd;
+ }
+ close (fd);
+ }
+ } /* iteration */
+ return -1;
+}
+#endif /* HAVE_PTYS */
+
+static int
+create_bidirectional_pipe (int *inchannel, int *outchannel,
+ volatile int *forkin, volatile int *forkout)
+{
+ int sv[2];
+
+#ifdef SKTPAIR
+ if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
+ return -1;
+ *outchannel = *inchannel = sv[0];
+ *forkout = *forkin = sv[1];
+#else /* not SKTPAIR */
+ int temp;
+ temp = pipe (sv);
+ if (temp < 0) return -1;
+ *inchannel = sv[0];
+ *forkout = sv[1];
+ temp = pipe (sv);
+ if (temp < 0) return -1;
+ *outchannel = sv[1];
+ *forkin = sv[0];
+#endif /* not SKTPAIR */
+ return 0;
+}
+
+
+#ifdef HAVE_SOCKETS
+
+#if !(defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO))
+static int
+get_internet_address (Lisp_Object host, struct sockaddr_in *address,
+ Error_behavior errb)
+{
+ struct hostent *host_info_ptr = NULL;
+#ifdef TRY_AGAIN
+ int count = 0;
+#endif
+
+ xzero (*address);
+
+ while (1)
+ {
+#ifdef TRY_AGAIN
+ if (count++ > 10) break;
+#ifndef BROKEN_CYGWIN
+ h_errno = 0;
+#endif
+#endif
+ /* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */
+ slow_down_interrupts ();
+ host_info_ptr = gethostbyname ((char *) XSTRING_DATA (host));
+ speed_up_interrupts ();
+#ifdef TRY_AGAIN
+ if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
+#endif
+ break;
+ Fsleep_for (make_int (1));
+ }
+ if (host_info_ptr)
+ {
+ address->sin_family = host_info_ptr->h_addrtype;
+ memcpy (&address->sin_addr, host_info_ptr->h_addr, host_info_ptr->h_length);
+ }
+ else
+ {
+ IN_ADDR numeric_addr;
+ /* Attempt to interpret host as numeric inet address */
+ numeric_addr = inet_addr ((char *) XSTRING_DATA (host));
+ if (NUMERIC_ADDR_ERROR)
+ {
+ maybe_error (Qprocess, errb,
+ "Unknown host \"%s\"", XSTRING_DATA (host));
+ return 0;
+ }
+
+ /* There was some broken code here that called strlen() here
+ on (char *) &numeric_addr and even sometimes accessed
+ uninitialized data. */
+ address->sin_family = AF_INET;
+ * (IN_ADDR *) &address->sin_addr = numeric_addr;
+ }
+
+ return 1;
+}
+#endif /* !(HAVE_GETADDRINFO && HAVE_GETNAMEINFO) */
+
+static void
+set_socket_nonblocking_maybe (int fd, int port, const char* proto)
+{
+#ifdef PROCESS_IO_BLOCKING
+ Lisp_Object tail;
+
+ for (tail = network_stream_blocking_port_list; CONSP (tail); tail = XCDR (tail))
+ {
+ Lisp_Object tail_port = XCAR (tail);
+
+ if (STRINGP (tail_port))
+ {
+ struct servent *svc_info;
+ CHECK_STRING (tail_port);
+ svc_info = getservbyname ((char *) XSTRING_DATA (tail_port), proto);
+ if ((svc_info != 0) && (svc_info->s_port == port))
+ break;
+ else
+ continue;
+ }
+ else if (INTP (tail_port) && (htons ((unsigned short) XINT (tail_port)) == port))
+ break;
+ }
+
+ if (!CONSP (tail))
+ {
+ set_descriptor_non_blocking (fd);
+ }
+#else
+ set_descriptor_non_blocking (fd);
+#endif /* PROCESS_IO_BLOCKING */
+}
+
+#endif /* HAVE_SOCKETS */
+
+/* Compute the Lisp form of the process status from
+ the numeric status that was returned by `wait'. */
+
+static void
+update_status_from_wait_code (Lisp_Process *p, int *w_fmh)
+{
+ /* C compiler lossage when attempting to pass w directly */
+ int w = *w_fmh;
+
+ if (WIFSTOPPED (w))
+ {
+ p->status_symbol = Qstop;
+ p->exit_code = WSTOPSIG (w);
+ p->core_dumped = 0;
+ }
+ else if (WIFEXITED (w))
+ {
+ p->status_symbol = Qexit;
+ p->exit_code = WEXITSTATUS (w);
+ p->core_dumped = 0;
+ }
+ else if (WIFSIGNALED (w))
+ {
+ p->status_symbol = Qsignal;
+ p->exit_code = WTERMSIG (w);
+ p->core_dumped = WCOREDUMP (w);
+ }
+ else
+ {
+ p->status_symbol = Qrun;
+ p->exit_code = 0;
+ }
+}
+
+#ifdef SIGCHLD
+
+#define MAX_EXITED_PROCESSES 1000
+static volatile pid_t exited_processes[MAX_EXITED_PROCESSES];
+static volatile int exited_processes_status[MAX_EXITED_PROCESSES];
+static volatile int exited_processes_index;
+
+static volatile int sigchld_happened;
+
+/* On receipt of a signal that a child status has changed,
+ loop asking about children with changed statuses until
+ the system says there are no more. All we do is record
+ the processes and wait status.
+
+ This function could be called from within the SIGCHLD
+ handler, so it must be completely reentrant. When
+ not called from a SIGCHLD handler, BLOCK_SIGCHLD should
+ be non-zero so that SIGCHLD is blocked while this
+ function is running. (This is necessary so avoid
+ race conditions with the SIGCHLD_HAPPENED flag). */
+
+static void
+record_exited_processes (int block_sigchld)
+{
+ if (!sigchld_happened)
+ {
+ return;
+ }
+
+#ifdef EMACS_BLOCK_SIGNAL
+ if (block_sigchld)
+ EMACS_BLOCK_SIGNAL (SIGCHLD);
+#endif
+
+ while (sigchld_happened)
+ {
+ int pid;
+ int w;
+
+ /* Keep trying to get a status until we get a definitive result. */
+ do
+ {
+ errno = 0;
+#ifdef WNOHANG
+# ifndef WUNTRACED
+# define WUNTRACED 0
+# endif /* not WUNTRACED */
+# ifdef HAVE_WAITPID
+ pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED);
+# else
+ pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
+# endif
+#else /* not WNOHANG */
+ pid = wait (&w);
+#endif /* not WNOHANG */
+ }
+ while (pid <= 0 && errno == EINTR);
+
+ if (pid <= 0)
+ break;
+
+ if (exited_processes_index < MAX_EXITED_PROCESSES)
+ {
+ exited_processes[exited_processes_index] = pid;
+ exited_processes_status[exited_processes_index] = w;
+ exited_processes_index++;
+ }
+
+ /* On systems with WNOHANG, we just ignore the number
+ of times that SIGCHLD was signalled, and keep looping
+ until there are no more processes to wait on. If we
+ don't have WNOHANG, we have to rely on the count in
+ SIGCHLD_HAPPENED. */
+#ifndef WNOHANG
+ sigchld_happened--;
+#endif /* not WNOHANG */
+ }
+
+ sigchld_happened = 0;
+
+ if (block_sigchld)
+ EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+}
+
+/* For any processes that have changed status and are recorded
+ and such, update the corresponding Lisp_Process.
+ We separate this from record_exited_processes() so that
+ we never have to call this function from within a signal
+ handler. We block SIGCHLD in case record_exited_processes()
+ is called from a signal handler. */
+
+/** USG WARNING: Although it is not obvious from the documentation
+ in signal(2), on a USG system the SIGCLD handler MUST NOT call
+ signal() before executing at least one wait(), otherwise the handler
+ will be called again, resulting in an infinite loop. The relevant
+ portion of the documentation reads "SIGCLD signals will be queued
+ and the signal-catching function will be continually reentered until
+ the queue is empty". Invoking signal() causes the kernel to reexamine
+ the SIGCLD queue. Fred Fish, UniSoft Systems Inc.
+
+ (Note that now this only applies in SYS V Release 2 and before.
+ On SYS V Release 3, we use sigset() to set the signal handler for
+ the first time, and so we don't have to reestablish the signal handler
+ in the handler below. On SYS V Release 4, we don't get this weirdo
+ behavior when we use sigaction(), which we do use.) */
+
+static SIGTYPE
+sigchld_handler (int signo)
+{
+#ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
+ int old_errno = errno;
+
+ sigchld_happened++;
+ record_exited_processes (0);
+ errno = old_errno;
+#else
+ sigchld_happened++;
+#endif
+#ifdef HAVE_UNIXOID_EVENT_LOOP
+ signal_fake_event ();
+#endif
+ /* WARNING - must come after wait3() for USG systems */
+ EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler);
+ SIGRETURN;
+}
+
+#endif /* SIGCHLD */
+
+#ifdef SIGNALS_VIA_CHARACTERS
+/* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */
+
+static int
+process_signal_char (int tty_fd, int signo)
+{
+ /* If it's not a tty, pray that these default values work */
+ if (! isatty (tty_fd)) {
+#define CNTL(ch) (037 & (ch))
+ switch (signo)
+ {
+ case SIGINT: return CNTL ('C');
+ case SIGQUIT: return CNTL ('\\');
+#ifdef SIGTSTP
+ case SIGTSTP: return CNTL ('Z');
+#endif
+ }
+ }
+
+#ifdef HAVE_TERMIOS
+ /* TERMIOS is the latest and bestest, and seems most likely to work.
+ If the system has it, use it. */
+ {
+ struct termios t;
+ tcgetattr (tty_fd, &t);
+ switch (signo)
+ {
+ case SIGINT: return t.c_cc[VINTR];
+ case SIGQUIT: return t.c_cc[VQUIT];
+#if defined(SIGTSTP) && defined(VSUSP)
+ case SIGTSTP: return t.c_cc[VSUSP];
+#endif
+ }
+ }
+
+# elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */
+ {
+ /* On Berkeley descendants, the following IOCTL's retrieve the
+ current control characters. */
+ struct tchars c;
+ struct ltchars lc;
+ switch (signo)
+ {
+ case SIGINT: ioctl (tty_fd, TIOCGETC, &c); return c.t_intrc;
+ case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c); return c.t_quitc;
+# ifdef SIGTSTP
+ case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc;
+# endif /* SIGTSTP */
+ }
+ }
+
+# elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
+ {
+ /* On SYSV descendants, the TCGETA ioctl retrieves the current
+ control characters. */
+ struct termio t;
+ ioctl (tty_fd, TCGETA, &t);
+ switch (signo) {
+ case SIGINT: return t.c_cc[VINTR];
+ case SIGQUIT: return t.c_cc[VQUIT];
+# ifdef SIGTSTP
+ case SIGTSTP: return t.c_cc[VSWTCH];
+# endif /* SIGTSTP */
+ }
+ }
+# else /* ! defined (TCGETA) */
+#error ERROR! Using SIGNALS_VIA_CHARACTERS, but not HAVE_TERMIOS || (TIOCGLTC && TIOCGETC) || TCGETA
+ /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
+ you'd better be using one of the alternatives above! */
+# endif /* ! defined (TCGETA) */
+ return '\0';
+}
+#endif /* SIGNALS_VIA_CHARACTERS */
+
+
+
+\f
+/**********************************************************************/
+/* Process implementation methods */
+/**********************************************************************/
+
+/*
+ * Allocate and initialize Lisp_Process->process_data
+ */
+
+static void
+unix_alloc_process_data (Lisp_Process *p)
+{
+ p->process_data = xnew (struct unix_process_data);
+
+ UNIX_DATA(p)->connected_via_filedesc_p = 0;
+ UNIX_DATA(p)->infd = -1;
+ UNIX_DATA(p)->subtty = -1;
+ UNIX_DATA(p)->tty_name = Qnil;
+ UNIX_DATA(p)->pty_flag = 0;
+}
+
+/*
+ * Mark any Lisp objects in Lisp_Process->process_data
+ */
+
+static void
+unix_mark_process_data (Lisp_Process *proc)
+{
+ mark_object (UNIX_DATA(proc)->tty_name);
+}
+
+/*
+ * Initialize XEmacs process implementation once
+ */
+
+#ifdef SIGCHLD
+static void
+unix_init_process (void)
+{
+#ifndef CANNOT_DUMP
+ if (! noninteractive || initialized)
+#endif
+ signal (SIGCHLD, sigchld_handler);
+}
+#endif /* SIGCHLD */
+
+/*
+ * Initialize any process local data. This is called when newly
+ * created process is connected to real OS file handles. The
+ * handles are generally represented by void* type, but are
+ * of type int (file descriptors) for UNIX.
+ */
+
+static void
+unix_init_process_io_handles (Lisp_Process *p, void* in, void* out, int flags)
+{
+ UNIX_DATA(p)->infd = (int)in;
+}
+
+/*
+ * Fork off a subprocess. P is a pointer to a newly created subprocess
+ * object. If this function signals, the caller is responsible for
+ * deleting (and finalizing) the process object.
+ *
+ * The method must return PID of the new process, a (positive??? ####) number
+ * which fits into Lisp_Int. No return value indicates an error, the method
+ * must signal an error instead.
+ */
+
+static int
+unix_create_process (Lisp_Process *p,
+ Lisp_Object *argv, int nargv,
+ Lisp_Object program, Lisp_Object cur_dir)
+{
+ int pid;
+ int inchannel = -1;
+ int outchannel = -1;
+ /* Use volatile to protect variables from being clobbered by longjmp. */
+ volatile int forkin = -1;
+ volatile int forkout = -1;
+ volatile int pty_flag = 0;
+
+#ifdef HAVE_PTYS
+ if (!NILP (Vprocess_connection_type))
+ {
+ /* find a new pty, open the master side, return the opened
+ file handle, and store the name of the corresponding slave
+ side in global variable pty_name. */
+ outchannel = inchannel = allocate_pty ();
+ }
+
+ if (inchannel >= 0)
+ {
+ /* You're "supposed" to now open the slave in the child.
+ On some systems, we can open it here; this allows for
+ better error checking. */
+#if !defined(USG)
+ /* On USG systems it does not work to open the pty's tty here
+ and then close and reopen it in the child. */
+#ifdef O_NOCTTY
+ /* Don't let this terminal become our controlling terminal
+ (in case we don't have one). */
+ forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY | OPEN_BINARY, 0);
+#else
+ forkout = forkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
+#endif
+ if (forkin < 0)
+ goto io_failure;
+#endif /* not USG */
+ UNIX_DATA(p)->pty_flag = pty_flag = 1;
+ }
+ else
+#endif /* HAVE_PTYS */
+ if (create_bidirectional_pipe (&inchannel, &outchannel,
+ &forkin, &forkout) < 0)
+ goto io_failure;
+
+#if 0
+ /* Replaced by close_process_descs */
+ set_exclusive_use (inchannel);
+ set_exclusive_use (outchannel);
+#endif
+
+ set_descriptor_non_blocking (inchannel);
+ set_descriptor_non_blocking (outchannel);
+
+ /* Record this as an active process, with its channels.
+ As a result, child_setup will close Emacs's side of the pipes. */
+ init_process_io_handles (p, (void*)inchannel, (void*)outchannel,
+ pty_flag ? STREAM_PTY_FLUSHING : 0);
+ /* Record the tty descriptor used in the subprocess. */
+ UNIX_DATA(p)->subtty = forkin;
+
+ {
+#if !defined(CYGWIN)
+ /* child_setup must clobber environ on systems with true vfork.
+ Protect it from permanent change. */
+ char **save_environ = environ;
+#endif
+
+ pid = fork ();
+ if (pid == 0)
+ {
+ /**** Now we're in the child process ****/
+ int xforkin = forkin;
+ int xforkout = forkout;
+
+ /* Checking for quit in the child is bad because that will
+ cause I/O, and that, in turn, can confuse the X connection. */
+ begin_dont_check_for_quit();
+
+ /* Disconnect the current controlling terminal, pursuant to
+ making the pty be the controlling terminal of the process.
+ Also put us in our own process group. */
+
+ disconnect_controlling_terminal ();
+
+#ifdef HAVE_PTYS
+ if (pty_flag)
+ {
+ /* Open the pty connection and make the pty's terminal
+ our controlling terminal.
+
+ On systems with TIOCSCTTY, we just use it to set
+ the controlling terminal. On other systems, the
+ first TTY we open becomes the controlling terminal.
+ So, we end up with four possibilities:
+
+ (1) on USG and TIOCSCTTY systems, we open the pty
+ and use TIOCSCTTY.
+ (2) on other USG systems, we just open the pty.
+ (3) on non-USG systems with TIOCSCTTY, we
+ just use TIOCSCTTY. (On non-USG systems, we
+ already opened the pty in the parent process.)
+ (4) on non-USG systems without TIOCSCTTY, we
+ close the pty and reopen it.
+
+ This would be cleaner if we didn't open the pty
+ in the parent process, but doing it that way
+ makes it possible to trap error conditions.
+ It's harder to convey an error from the child
+ process, and I don't feel like messing with
+ this now. */
+
+ /* There was some weirdo, probably wrong,
+ conditionalization on RTU and UNIPLUS here.
+ I deleted it. So sue me. */
+
+ /* SunOS has TIOCSCTTY but the close/open method
+ also works. */
+
+# if defined (USG) || !defined (TIOCSCTTY)
+ /* Now close the pty (if we had it open) and reopen it.
+ This makes the pty the controlling terminal of the
+ subprocess. */
+ /* I wonder if close (open (pty_name, ...)) would work? */
+ if (xforkin >= 0)
+ close (xforkin);
+ xforkout = xforkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
+ if (xforkin < 0)
+ {
+ write (1, "Couldn't open the pty terminal ", 31);
+ write (1, pty_name, strlen (pty_name));
+ write (1, "\n", 1);
+ _exit (1);
+ }
+# endif /* USG or not TIOCSCTTY */
+
+ /* Miscellaneous setup required for some systems.
+ Must be done before using tc* functions on xforkin.
+ This guarantees that isatty(xforkin) is true. */
+
+# if defined (HAVE_ISASTREAM) && defined (I_PUSH)
+ if (isastream (xforkin))
+ {
+# if defined (I_FIND)
+# define stream_module_pushed(fd, module) (ioctl (fd, I_FIND, module) == 1)
+# else
+# define stream_module_pushed(fd, module) 0
+# endif
+ if (! stream_module_pushed (xforkin, "ptem"))
+ ioctl (xforkin, I_PUSH, "ptem");
+ if (! stream_module_pushed (xforkin, "ldterm"))
+ ioctl (xforkin, I_PUSH, "ldterm");
+ if (! stream_module_pushed (xforkin, "ttcompat"))
+ ioctl (xforkin, I_PUSH, "ttcompat");
+ }
+# endif /* HAVE_ISASTREAM */
+
+# ifdef TIOCSCTTY
+ /* We ignore the return value
+ because faith@cs.unc.edu says that is necessary on Linux. */
+ assert (isatty (xforkin));
+ ioctl (xforkin, TIOCSCTTY, 0);
+# endif /* TIOCSCTTY */
+
+ /* Change the line discipline. */
+
+# if defined (HAVE_TERMIOS) && defined (LDISC1)
+ {
+ struct termios t;
+ assert (isatty (xforkin));
+ tcgetattr (xforkin, &t);
+ t.c_lflag = LDISC1;
+ if (tcsetattr (xforkin, TCSANOW, &t) < 0)
+ perror ("create_process/tcsetattr LDISC1 failed\n");
+ }
+# elif defined (NTTYDISC) && defined (TIOCSETD)
+ {
+ /* Use new line discipline. TIOCSETD is accepted and
+ ignored on Sys5.4 systems with ttcompat. */
+ int ldisc = NTTYDISC;
+ assert (isatty (xforkin));
+ ioctl (xforkin, TIOCSETD, &ldisc);
+ }
+# endif /* TIOCSETD & NTTYDISC */
+
+ /* Make our process group be the foreground group
+ of our new controlling terminal. */
+
+ {
+ pid_t piddly = EMACS_GET_PROCESS_GROUP ();
+ EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly);
+ }
+
+ /* On AIX, we've disabled SIGHUP above once we start a
+ child on a pty. Now reenable it in the child, so it
+ will die when we want it to.
+ JV: This needs to be done ALWAYS as we might have inherited
+ a SIG_IGN handling from our parent (nohup) and we are in new
+ process group.
+ */
+ signal (SIGHUP, SIG_DFL);
+ }
+
+ if (pty_flag)
+ /* Set up the terminal characteristics of the pty. */
+ child_setup_tty (xforkout);
+
+#endif /* HAVE_PTYS */
+
+ signal (SIGINT, SIG_DFL);
+ signal (SIGQUIT, SIG_DFL);
+
+ {
+ char *current_dir;
+ char **new_argv = alloca_array (char *, nargv + 2);
+ int i;
+
+ /* Nothing below here GCs so our string pointers shouldn't move. */
+ new_argv[0] = (char *) XSTRING_DATA (program);
+ for (i = 0; i < nargv; i++)
+ {
+ CHECK_STRING (argv[i]);
+ new_argv[i + 1] = (char *) XSTRING_DATA (argv[i]);
+ }
+ new_argv[i + 1] = 0;
+
+ LISP_STRING_TO_EXTERNAL (cur_dir, current_dir, Qfile_name);
+
+ child_setup (xforkin, xforkout, xforkout, new_argv, current_dir);
+ }
+
+ } /**** End of child code ****/
+
+ /**** Back in parent process ****/
+#if !defined(CYGWIN)
+ environ = save_environ;
+#endif
+ }
+
+ if (pid < 0)
+ {
+ int save_errno = errno;
+ close_descriptor_pair (forkin, forkout);
+ errno = save_errno;
+ report_file_error ("Doing fork", Qnil);
+ }
+
+ /* #### dmoore - why is this commented out, otherwise we leave
+ subtty = forkin, but then we close forkin just below. */
+ /* UNIX_DATA(p)->subtty = -1; */
+
+ /* If the subfork execv fails, and it exits,
+ this close hangs. I don't know why.
+ So have an interrupt jar it loose. */
+ if (forkin >= 0)
+ close_safely (forkin);
+ if (forkin != forkout && forkout >= 0)
+ close (forkout);
+
+#ifdef HAVE_PTYS
+ if (pty_flag)
+ UNIX_DATA (p)->tty_name = build_string (pty_name);
+ else
+#endif
+ UNIX_DATA (p)->tty_name = Qnil;
+
+ /* Notice that SIGCHLD was not blocked. (This is not possible on
+ some systems.) No biggie if SIGCHLD occurs right around the
+ time that this call happens, because SIGCHLD() does not actually
+ deselect the process (that doesn't occur until the next time
+ we're waiting for an event, when status_notify() is called). */
+ return pid;
+
+io_failure:
+ {
+ int save_errno = errno;
+ close_descriptor_pair (forkin, forkout);
+ close_descriptor_pair (inchannel, outchannel);
+ errno = save_errno;
+ report_file_error ("Opening pty or pipe", Qnil);
+ return 0; /* not reached */
+ }
+}
+
+/* Return nonzero if this process is a ToolTalk connection. */
+
+static int
+unix_tooltalk_connection_p (Lisp_Process *p)
+{
+ return UNIX_DATA(p)->connected_via_filedesc_p;
+}
+
+/* This is called to set process' virtual terminal size */
+
+static int
+unix_set_window_size (Lisp_Process* p, int cols, int rows)
+{
+ return set_window_size (UNIX_DATA(p)->infd, cols, rows);
+}
+
+/*
+ * This method is called to update status fields of the process
+ * structure. If the process has not existed, this method is
+ * expected to do nothing.
+ *
+ * The method is called only for real child processes.
+ */
+
+#ifdef HAVE_WAITPID
+static void
+unix_update_status_if_terminated (Lisp_Process* p)
+{
+ int w;
+#ifdef SIGCHLD
+ EMACS_BLOCK_SIGNAL (SIGCHLD);
+#endif
+ if (waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid))
+ {
+ p->tick++;
+ update_status_from_wait_code (p, &w);
+ }
+#ifdef SIGCHLD
+ EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+#endif
+}
+#endif
+
+/*
+ * Update status of all exited processes. Called when SIGCLD has signaled.
+ */
+
+#ifdef SIGCHLD
+static void
+unix_reap_exited_processes (void)
+{
+ int i;
+ Lisp_Process *p;
+
+#ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
+ record_exited_processes (1);
+#endif
+
+ if (exited_processes_index <= 0)
+ {
+ return;
+ }
+
+#ifdef EMACS_BLOCK_SIGNAL
+ EMACS_BLOCK_SIGNAL (SIGCHLD);
+#endif
+ for (i = 0; i < exited_processes_index; i++)
+ {
+ int pid = exited_processes[i];
+ int w = exited_processes_status[i];
+
+ /* Find the process that signaled us, and record its status. */
+
+ p = 0;
+ {
+ Lisp_Object tail;
+ LIST_LOOP (tail, Vprocess_list)
+ {
+ Lisp_Object proc = XCAR (tail);
+ p = XPROCESS (proc);
+ if (INTP (p->pid) && XINT (p->pid) == pid)
+ break;
+ p = 0;
+ }
+ }
+
+ if (p)
+ {
+ /* Change the status of the process that was found. */
+ p->tick++;
+ process_tick++;
+ update_status_from_wait_code (p, &w);
+
+ /* If process has terminated, stop waiting for its output. */
+ if (WIFSIGNALED (w) || WIFEXITED (w))
+ {
+ if (!NILP(p->pipe_instream))
+ {
+ /* We can't just call event_stream->unselect_process_cb (p)
+ here, because that calls XtRemoveInput, which is not
+ necessarily reentrant, so we can't call this at interrupt
+ level.
+ */
+ }
+ }
+ }
+ else
+ {
+ /* There was no asynchronous process found for that id. Check
+ if we have a synchronous process. Only set sync process status
+ if there is one, so we work OK with the waitpid() call in
+ wait_for_termination(). */
+ if (synch_process_alive != 0)
+ { /* Set the global sync process status variables. */
+ synch_process_alive = 0;
+
+ /* Report the status of the synchronous process. */
+ if (WIFEXITED (w))
+ synch_process_retcode = WEXITSTATUS (w);
+ else if (WIFSIGNALED (w))
+ synch_process_death = signal_name (WTERMSIG (w));
+ }
+ }
+ }
+
+ exited_processes_index = 0;
+
+ EMACS_UNBLOCK_SIGNAL (SIGCHLD);
+}
+#endif /* SIGCHLD */
+
+/*
+ * Stuff the entire contents of LSTREAM to the process output pipe
+ */
+
+static JMP_BUF send_process_frame;
+
+static SIGTYPE
+send_process_trap (int signum)
+{
+ EMACS_REESTABLISH_SIGNAL (signum, send_process_trap);
+ EMACS_UNBLOCK_SIGNAL (signum);
+ LONGJMP (send_process_frame, 1);
+}
+
+static void
+unix_send_process (Lisp_Object proc, struct lstream* lstream)
+{
+ /* Use volatile to protect variables from being clobbered by longjmp. */
+ SIGTYPE (*volatile old_sigpipe) (int) = 0;
+ volatile Lisp_Object vol_proc = proc;
+ Lisp_Process *volatile p = XPROCESS (proc);
+
+ /* #### JV: layering violation?
+
+ This function knows too much about the relation between the encoding
+ stream (DATA_OUTSTREAM) and the actual output stream p->output_stream.
+
+ If encoding streams properly forwarded all calls, we could simply
+ use DATA_OUTSTREAM everywhere. */
+
+ if (!SETJMP (send_process_frame))
+ {
+ /* use a reasonable-sized buffer (somewhere around the size of the
+ stream buffer) so as to avoid inundating the stream with blocked
+ data. */
+ Bufbyte chunkbuf[512];
+ Bytecount chunklen;
+
+ do
+ {
+ Lstream_data_count writeret;
+
+ chunklen = Lstream_read (lstream, chunkbuf, 512);
+ old_sigpipe =
+ (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
+ if (chunklen > 0)
+ {
+ int save_errno;
+
+ /* Lstream_write() will never successfully write less than
+ the amount sent in. In the worst case, it just buffers
+ the unwritten data. */
+ writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf,
+ chunklen);
+ save_errno = errno;
+ signal (SIGPIPE, old_sigpipe);
+ errno = save_errno;
+ if (writeret < 0)
+ /* This is a real error. Blocking errors are handled
+ specially inside of the filedesc stream. */
+ report_file_error ("writing to process", list1 (proc));
+ }
+ else
+ {
+ /* Need to make sure that everything up to and including the
+ last chunk is flushed, even when the pipe is currently
+ blocked. */
+ Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
+ signal (SIGPIPE, old_sigpipe);
+ }
+ while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream)))
+ {
+ /* Buffer is full. Wait, accepting input;
+ that may allow the program
+ to finish doing output and read more. */
+ Faccept_process_output (Qnil, make_int (1), Qnil);
+ /* It could have *really* finished, deleting the process */
+ if (NILP(p->pipe_outstream))
+ return;
+ old_sigpipe =
+ (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
+ Lstream_flush (XLSTREAM (p->pipe_outstream));
+ signal (SIGPIPE, old_sigpipe);
+ }
+ /* Perhaps should abort() if < 0? This should never happen. */
+ }
+ while (chunklen > 0);
+ }
+ else
+ { /* We got here from a longjmp() from the SIGPIPE handler */
+ signal (SIGPIPE, old_sigpipe);
+ /* Close the file lstream so we don't attempt to write to it further */
+ /* #### There is controversy over whether this might cause fd leakage */
+ /* my tests say no. -slb */
+ XLSTREAM (p->pipe_outstream)->flags &= ~LSTREAM_FL_IS_OPEN;
+#ifdef FILE_CODING
+ XLSTREAM (p->coding_outstream)->flags &= ~LSTREAM_FL_IS_OPEN;
+#endif
+ p->status_symbol = Qexit;
+ p->exit_code = 256; /* #### SIGPIPE ??? */
+ p->core_dumped = 0;
+ p->tick++;
+ process_tick++;
+ deactivate_process (*((Lisp_Object *) (&vol_proc)));
+ invalid_operation ("SIGPIPE raised on process; closed it", p->name);
+ }
+
+ old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
+ Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
+ signal (SIGPIPE, old_sigpipe);
+}
+
+/*
+ * Send EOF to the process. The default implementation simply
+ * closes the output stream. The method must return 0 to call
+ * the default implementation, or 1 if it has taken all care about
+ * sending EOF to the process.
+ */
+
+static int
+unix_process_send_eof (Lisp_Object proc)
+{
+ if (!UNIX_DATA (XPROCESS (proc))->pty_flag)
+ return 0;
+
+ /* #### get_eof_char simply doesn't return the correct character
+ here. Maybe it is needed to determine the right eof
+ character in init_process_io_handles but here it simply screws
+ things up. */
+#if 0
+ Bufbyte eof_char = get_eof_char (XPROCESS (proc));
+ send_process (proc, Qnil, &eof_char, 0, 1);
+#else
+ send_process (proc, Qnil, (const Bufbyte *) "\004", 0, 1);
+#endif
+ return 1;
+}
+
+/*
+ * Called before the process is deactivated. The process object
+ * is not immediately finalized, just undergoes a transition to
+ * inactive state.
+ *
+ * The return value is a unique stream ID, as returned by
+ * event_stream_delete_stream_pair
+ *
+ * In the lack of this method, only event_stream_delete_stream_pair
+ * is called on both I/O streams of the process.
+ *
+ * The UNIX version guards this by ignoring possible SIGPIPE.
+ */
+
+static USID
+unix_deactivate_process (Lisp_Process *p)
+{
+ SIGTYPE (*old_sigpipe) (int) = 0;
+ USID usid;
+
+ if (UNIX_DATA(p)->infd >= 0)
+ flush_pending_output (UNIX_DATA(p)->infd);
+
+ /* closing the outstream could result in SIGPIPE, so ignore it. */
+ old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, SIG_IGN);
+ usid = event_stream_delete_stream_pair (p->pipe_instream, p->pipe_outstream);
+ signal (SIGPIPE, old_sigpipe);
+
+ UNIX_DATA(p)->infd = -1;
+
+ return usid;
+}
+
+/* If the subtty field of the process data is not filled in, do so now. */
+static void
+try_to_initialize_subtty (struct unix_process_data *upd)
+{
+ if (upd->pty_flag
+ && (upd->subtty == -1 || ! isatty (upd->subtty))
+ && STRINGP (upd->tty_name))
+ upd->subtty = open ((char *) XSTRING_DATA (upd->tty_name), O_RDWR, 0);
+}
+
+/* Send signal number SIGNO to PROCESS.
+ CURRENT_GROUP means send to the process group that currently owns
+ the terminal being used to communicate with PROCESS.
+ This is used for various commands in shell mode.
+ If NOMSG is zero, insert signal-announcements into process's buffers
+ right away.
+
+ If we can, we try to signal PROCESS by sending control characters
+ down the pty. This allows us to signal inferiors who have changed
+ their uid, for which killpg would return an EPERM error,
+ or processes running on other machines via remote login.
+
+ The method signals an error if the given SIGNO is not valid. */
+
+static void
+unix_kill_child_process (Lisp_Object proc, int signo,
+ int current_group, int nomsg)
+{
+ pid_t pgid = -1;
+ Lisp_Process *p = XPROCESS (proc);
+ struct unix_process_data *d = UNIX_DATA (p);
+
+ switch (signo)
+ {
+#ifdef SIGCONT
+ case SIGCONT:
+ p->status_symbol = Qrun;
+ p->exit_code = 0;
+ p->tick++;
+ process_tick++;
+ if (!nomsg)
+ status_notify ();
+ break;
+#endif /* ! defined (SIGCONT) */
+ case SIGINT:
+ case SIGQUIT:
+ case SIGKILL:
+ flush_pending_output (d->infd);
+ break;
+ }
+
+ if (! d->pty_flag)
+ current_group = 0;
+
+ /* If current_group is true, we want to send a signal to the
+ foreground process group of the terminal our child process is
+ running on. You would think that would be easy.
+
+ The BSD people invented the TIOCPGRP ioctl to get the foreground
+ process group of a tty. That, combined with killpg, gives us
+ what we want.
+
+ However, the POSIX standards people, in their infinite wisdom,
+ have seen fit to only allow this for processes which have the
+ terminal as controlling terminal, which doesn't apply to us.
+
+ Sooo..., we have to do something non-standard. The ioctls
+ TIOCSIGNAL, TIOCSIG, and TIOCSIGSEND send the signal directly on
+ many systems. POSIX tcgetpgrp(), since it is *documented* as not
+ doing what we want, is actually less likely to work than the BSD
+ ioctl TIOCGPGRP it is supposed to obsolete. Sometimes we have to
+ use TIOCGPGRP on the master end, sometimes the slave end
+ (probably an AIX bug). So we better get a fd for the slave if we
+ haven't got it yet.
+
+ Anal operating systems like SGI Irix and Compaq Tru64 adhere
+ strictly to the letter of the law, so our hack doesn't work.
+ The following fragment from an Irix header file is suggestive:
+
+ #ifdef __notdef__
+ // this is not currently supported
+ #define TIOCSIGNAL (tIOC|31) // pty: send signal to slave
+ #endif
+
+ On those systems where none of our tricks work, we just fall back
+ to the non-current_group behavior and kill the process group of
+ the child.
+ */
+ if (current_group)
+ {
+ try_to_initialize_subtty (d);
+
+#ifdef SIGNALS_VIA_CHARACTERS
+ /* If possible, send signals to the entire pgrp
+ by sending an input character to it. */
+ {
+ char sigchar = process_signal_char (d->subtty, signo);
+ if (sigchar)
+ {
+ send_process (proc, Qnil, (Bufbyte *) &sigchar, 0, 1);
+ return;
+ }
+ }
+#endif /* SIGNALS_VIA_CHARACTERS */
+
+#ifdef TIOCGPGRP
+ if (pgid == -1)
+ ioctl (d->infd, TIOCGPGRP, &pgid); /* BSD */
+ if (pgid == -1 && d->subtty != -1)
+ ioctl (d->subtty, TIOCGPGRP, &pgid); /* Only this works on AIX! */
+#endif /* TIOCGPGRP */
+
+ if (pgid == -1)
+ {
+ /* Many systems provide an ioctl to send a signal directly */
+#ifdef TIOCSIGNAL /* Solaris, HP-UX */
+ if (ioctl (d->infd, TIOCSIGNAL, signo) != -1)
+ return;
+#endif /* TIOCSIGNAL */
+
+#ifdef TIOCSIG /* BSD */
+ if (ioctl (d->infd, TIOCSIG, signo) != -1)
+ return;
+#endif /* TIOCSIG */
+ }
+ } /* current_group */
+
+ if (pgid == -1)
+ /* Either current_group is 0, or we failed to get the foreground
+ process group using the trickery above. So we fall back to
+ sending the signal to the process group of our child process.
+ Since this is often a shell that ignores signals like SIGINT,
+ the shell's subprocess is killed, which is the desired effect.
+ The process group of p->pid is always p->pid, since it was
+ created as a process group leader. */
+ pgid = XINT (p->pid);
+
+ /* Finally send the signal. */
+ if (EMACS_KILLPG (pgid, signo) == -1)
+ {
+ /* It's not an error if our victim is already dead.
+ And we can't rely on the result of killing a zombie, since
+ XPG 4.2 requires that killing a zombie fail with ESRCH,
+ while FIPS 151-2 requires that it succeeds! */
+#ifdef ESRCH
+ if (errno != ESRCH)
+#endif
+ error ("kill (%ld, %ld) failed: %s",
+ (long) pgid, (long) signo, strerror (errno));
+ }
+}
+
+/* Send signal SIGCODE to any process in the system given its PID.
+ Return zero if successful, a negative number upon failure. */
+
+static int
+unix_kill_process_by_pid (int pid, int sigcode)
+{
+ return kill (pid, sigcode);
+}
+
+/* Return TTY name used to communicate with subprocess. */
+
+static Lisp_Object
+unix_get_tty_name (Lisp_Process *p)
+{
+ return UNIX_DATA (p)->tty_name;
+}
+
+/* Canonicalize host name HOST, and return its canonical form.
+ The default implementation just takes HOST for a canonical name. */
+
+#ifdef HAVE_SOCKETS
+static Lisp_Object
+unix_canonicalize_host_name (Lisp_Object host)
+{
+#if defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO)
+ struct addrinfo hints, *res;
+ static char addrbuf[NI_MAXHOST];
+ Lisp_Object canonname;
+ int retval;
+ char *ext_host;
+
+ xzero (hints);
+ hints.ai_flags = AI_CANONNAME;
+#ifdef IPV6_CANONICALIZE
+ hints.ai_family = AF_UNSPEC;
+#else
+ hints.ai_family = PF_INET;
+#endif
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = 0;
+ LISP_STRING_TO_EXTERNAL (host, ext_host, Qnative);
+ retval = getaddrinfo (ext_host, NULL, &hints, &res);
+ if (retval != 0)
+ {
+ char *gai_error;
+
+ EXTERNAL_TO_C_STRING (gai_strerror (retval), gai_error, Qnative);
+ maybe_error (Qprocess, ERROR_ME_NOT,
+ "%s \"%s\"", gai_error, XSTRING_DATA (host));
+ canonname = host;
+ }
+ else
+ {
+ int gni = getnameinfo (res->ai_addr, res->ai_addrlen,
+ addrbuf, sizeof(addrbuf),
+ NULL, 0, NI_NUMERICHOST);
+ canonname = gni ? host : build_ext_string (addrbuf, Qnative);
+
+ freeaddrinfo (res);
+ }
+
+ return canonname;
+#else /* ! HAVE_GETADDRINFO */
+ struct sockaddr_in address;
+
+ if (!get_internet_address (host, &address, ERROR_ME_NOT))
+ return host;
+
+ if (address.sin_family == AF_INET)
+ return build_string (inet_ntoa (address.sin_addr));
+ else
+ /* #### any clue what to do here? */
+ return host;
+#endif /* ! HAVE_GETADDRINFO */
+}
+
+/* Open a TCP network connection to a given HOST/SERVICE.
+ Treated exactly like a normal process when reading and writing.
+ Only differences are in status display and process deletion.
+ A network connection has no PID; you cannot signal it. All you can
+ do is deactivate and close it via delete-process. */
+
+static void
+unix_open_network_stream (Lisp_Object name, Lisp_Object host, Lisp_Object service,
+ Lisp_Object protocol, void** vinfd, void** voutfd)
+{
+ int inch;
+ int outch;
+ volatile int s;
+ volatile int port;
+ volatile int retry = 0;
+ int retval;
+
+ CHECK_STRING (host);
+
+ if (!EQ (protocol, Qtcp) && !EQ (protocol, Qudp))
+ invalid_argument ("Unsupported protocol", protocol);
+
+ {
+#if defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO)
+ struct addrinfo hints, *res;
+ struct addrinfo * volatile lres;
+ char *portstring;
+ volatile int xerrno = 0;
+ volatile int failed_connect = 0;
+ char *ext_host;
+ char portbuf[sizeof(long)*3 + 2];
+ /*
+ * Caution: service can either be a string or int.
+ * Convert to a C string for later use by getaddrinfo.
+ */
+ if (INTP (service))
+ {
+ snprintf (portbuf, sizeof (portbuf), "%ld", (long) XINT (service));
+ portstring = portbuf;
+ port = htons ((unsigned short) XINT (service));
+ }
+ else
+ {
+ CHECK_STRING (service);
+ LISP_STRING_TO_EXTERNAL (service, portstring, Qnative);
+ port = 0;
+ }
+
+ xzero (hints);
+ hints.ai_flags = 0;
+ hints.ai_family = AF_UNSPEC;
+ if (EQ (protocol, Qtcp))
+ hints.ai_socktype = SOCK_STREAM;
+ else /* EQ (protocol, Qudp) */
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_protocol = 0;
+ LISP_STRING_TO_EXTERNAL (host, ext_host, Qnative);
+ retval = getaddrinfo (ext_host, portstring, &hints, &res);
+ if (retval != 0)
+ {
+ char *gai_error;
+
+ EXTERNAL_TO_C_STRING (gai_strerror (retval), gai_error, Qnative);
+ error ("%s/%s %s", XSTRING_DATA (host), portstring, gai_error);
+ }
+
+ /* address loop */
+ for (lres = res; lres ; lres = lres->ai_next)
+ {
+ if (EQ (protocol, Qtcp))
+ s = socket (lres->ai_family, SOCK_STREAM, 0);
+ else /* EQ (protocol, Qudp) */
+ s = socket (lres->ai_family, SOCK_DGRAM, 0);
+
+ if (s < 0)
+ continue;
+
+ /* Turn off interrupts here -- see comments below. There used to
+ be code which called bind_polling_period() to slow the polling
+ period down rather than turn it off, but that seems rather
+ bogus to me. Best thing here is to use a non-blocking connect
+ or something, to check for QUIT. */
+
+ /* Comments that are not quite valid: */
+
+ /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
+ when connect is interrupted. So let's not let it get interrupted.
+ Note we do not turn off polling, because polling is only used
+ when not interrupt_input, and thus not normally used on the systems
+ which have this bug. On systems which use polling, there's no way
+ to quit if polling is turned off. */
+
+ /* Slow down polling. Some kernels have a bug which causes retrying
+ connect to fail after a connect. */
+
+ slow_down_interrupts ();
+
+ loop:
+
+ /* A system call interrupted with a SIGALRM or SIGIO comes back
+ here, with can_break_system_calls reset to 0. */
+ SETJMP (break_system_call_jump);
+ if (QUITP)
+ {
+ speed_up_interrupts ();
+ REALLY_QUIT;
+ /* In case something really weird happens ... */
+ slow_down_interrupts ();
+ }
+
+ /* Break out of connect with a signal (it isn't otherwise possible).
+ Thus you don't get screwed with a hung network. */
+ can_break_system_calls = 1;
+ retval = connect (s, lres->ai_addr, lres->ai_addrlen);
+ can_break_system_calls = 0;
+ if (retval == -1)
+ {
+ xerrno = errno;
+ if (errno != EISCONN)
+ {
+ if (errno == EINTR)
+ goto loop;
+ if (errno == EADDRINUSE && retry < 20)
+ {
+ /* A delay here is needed on some FreeBSD systems,
+ and it is harmless, since this retrying takes time anyway
+ and should be infrequent.
+ `sleep-for' allowed for quitting this loop with interrupts
+ slowed down so it can't be used here. Async timers should
+ already be disabled at this point so we can use `sleep'. */
+ sleep (1);
+ retry++;
+ goto loop;
+ }
+ }
+
+ failed_connect = 1;
+ close (s);
+ s = -1;
+
+ speed_up_interrupts ();
+
+ continue;
+ }
+
+ if (port == 0)
+ {
+ int gni;
+ char servbuf[NI_MAXSERV];
+
+ if (EQ (protocol, Qtcp))
+ gni = getnameinfo (lres->ai_addr, lres->ai_addrlen,
+ NULL, 0, servbuf, sizeof(servbuf),
+ NI_NUMERICSERV);
+ else /* EQ (protocol, Qudp) */
+ gni = getnameinfo (lres->ai_addr, lres->ai_addrlen,
+ NULL, 0, servbuf, sizeof(servbuf),
+ NI_NUMERICSERV | NI_DGRAM);
+
+ if (gni == 0)
+ port = strtol (servbuf, NULL, 10);
+ }
+
+ break;
+ } /* address loop */
+
+ speed_up_interrupts ();
+
+ freeaddrinfo (res);
+ if (s < 0)
+ {
+ errno = xerrno;
+
+ if (failed_connect)
+ report_file_error ("connection failed", list2 (host, name));
+ else
+ report_file_error ("error creating socket", list1 (name));
+ }
+#else /* ! HAVE_GETADDRINFO */
+ struct sockaddr_in address;
+
+ if (INTP (service))
+ port = htons ((unsigned short) XINT (service));
+ else
+ {
+ struct servent *svc_info;
+ CHECK_STRING (service);
+
+ if (EQ (protocol, Qtcp))
+ svc_info = getservbyname ((char *) XSTRING_DATA (service), "tcp");
+ else /* EQ (protocol, Qudp) */
+ svc_info = getservbyname ((char *) XSTRING_DATA (service), "udp");
+
+ if (svc_info == 0)
+ invalid_argument ("Unknown service", service);
+ port = svc_info->s_port;
+ }
+
+ get_internet_address (host, &address, ERROR_ME);
+ address.sin_port = port;
+
+ if (EQ (protocol, Qtcp))
+ s = socket (address.sin_family, SOCK_STREAM, 0);
+ else /* EQ (protocol, Qudp) */
+ s = socket (address.sin_family, SOCK_DGRAM, 0);
+
+ if (s < 0)
+ report_file_error ("error creating socket", list1 (name));
+
+ /* Turn off interrupts here -- see comments below. There used to
+ be code which called bind_polling_period() to slow the polling
+ period down rather than turn it off, but that seems rather
+ bogus to me. Best thing here is to use a non-blocking connect
+ or something, to check for QUIT. */
+
+ /* Comments that are not quite valid: */
+
+ /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
+ when connect is interrupted. So let's not let it get interrupted.
+ Note we do not turn off polling, because polling is only used
+ when not interrupt_input, and thus not normally used on the systems
+ which have this bug. On systems which use polling, there's no way
+ to quit if polling is turned off. */
+
+ /* Slow down polling. Some kernels have a bug which causes retrying
+ connect to fail after a connect. */
+
+ slow_down_interrupts ();
+
+ loop:
+
+ /* A system call interrupted with a SIGALRM or SIGIO comes back
+ here, with can_break_system_calls reset to 0. */
+ SETJMP (break_system_call_jump);
+ if (QUITP)
+ {
+ speed_up_interrupts ();
+ REALLY_QUIT;
+ /* In case something really weird happens ... */
+ slow_down_interrupts ();
+ }
+
+ /* Break out of connect with a signal (it isn't otherwise possible).
+ Thus you don't get screwed with a hung network. */
+ can_break_system_calls = 1;
+ retval = connect (s, (struct sockaddr *) &address, sizeof (address));
+ can_break_system_calls = 0;
+ if (retval == -1 && errno != EISCONN)
+ {
+ int xerrno = errno;
+ if (errno == EINTR)
+ goto loop;
+ if (errno == EADDRINUSE && retry < 20)
+ {
+ /* A delay here is needed on some FreeBSD systems,
+ and it is harmless, since this retrying takes time anyway
+ and should be infrequent.
+ `sleep-for' allowed for quitting this loop with interrupts
+ slowed down so it can't be used here. Async timers should
+ already be disabled at this point so we can use `sleep'. */
+ sleep (1);
+ retry++;
+ goto loop;
+ }
+
+ close (s);
+
+ speed_up_interrupts ();
+
+ errno = xerrno;
+ report_file_error ("connection failed", list2 (host, name));
+ }
+
+ speed_up_interrupts ();
+#endif /* ! HAVE_GETADDRINFO */
+ }
+
+ inch = s;
+ outch = dup (s);
+ if (outch < 0)
+ {
+ close (s); /* this used to be leaked; from Kyle Jones */
+ report_file_error ("error duplicating socket", list1 (name));
+ }
+
+ set_socket_nonblocking_maybe (inch, port, "tcp");
+
+ *vinfd = (void*)inch;
+ *voutfd = (void*)outch;
+}
+
+
+#ifdef HAVE_MULTICAST
+
+/* Didier Verna <didier@xemacs.org> Nov. 28 1997.
+
+ This function is similar to open-network-stream-internal, but provides a
+ mean to open an UDP multicast connection instead of a TCP one. Like in the
+ TCP case, the multicast connection will be seen as a sub-process,
+
+ Some notes:
+ - Normally, we should use sendto and recvfrom with non connected
+ sockets. The current code doesn't allow us to do this. In the future, it
+ would be a good idea to extend the process data structure in order to deal
+ properly with the different types network connections.
+ - For the same reason, when leaving a multicast group, it is better to make
+ a setsockopt - IP_DROP_MEMBERSHIP before closing the descriptors.
+ Unfortunately, this can't be done here because delete_process doesn't know
+ about the kind of connection we have. However, this is not such an
+ important issue.
+*/
+
+static void
+unix_open_multicast_group (Lisp_Object name, Lisp_Object dest,
+ Lisp_Object port, Lisp_Object ttl, void** vinfd,
+ void** voutfd)
+{
+ struct ip_mreq imr;
+ struct sockaddr_in sa;
+ struct protoent *udp;
+ int ws, rs;
+ int theport;
+ unsigned char thettl;
+ int one = 1; /* For REUSEADDR */
+ int ret;
+ volatile int retry = 0;
+
+ CHECK_STRING (dest);
+
+ CHECK_NATNUM (port);
+ theport = htons ((unsigned short) XINT (port));
+
+ CHECK_NATNUM (ttl);
+ thettl = (unsigned char) XINT (ttl);
+
+ if ((udp = getprotobyname ("udp")) == NULL)
+ type_error (Qinvalid_operation, "No info available for UDP protocol");
+
+ /* Init the sockets. Yes, I need 2 sockets. I couldn't duplicate one. */
+ if ((rs = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
+ report_file_error ("error creating socket", list1(name));
+ if ((ws = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
+ {
+ close (rs);
+ report_file_error ("error creating socket", list1(name));
+ }
+
+ /* This will be used for both sockets */
+ memset (&sa, 0, sizeof(sa));
+ sa.sin_family = AF_INET;
+ sa.sin_port = theport;
+ sa.sin_addr.s_addr = inet_addr ((char *) XSTRING_DATA (dest));
+
+ /* Socket configuration for reading ------------------------ */
+
+ /* Multiple connections from the same machine. This must be done before
+ bind. If it fails, it shouldn't be fatal. The only consequence is that
+ people won't be able to connect twice from the same machine. */
+ if (setsockopt (rs, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one))
+ < 0)
+ warn_when_safe (Qmulticast, Qwarning, "Cannot reuse socket address");
+
+ /* bind socket name */
+ if (bind (rs, (struct sockaddr *)&sa, sizeof(sa)))
+ {
+ close (rs);
+ close (ws);
+ report_file_error ("error binding socket", list2(name, port));
+ }
+
+ /* join multicast group */
+ imr.imr_multiaddr.s_addr = inet_addr ((char *) XSTRING_DATA (dest));
+ imr.imr_interface.s_addr = htonl (INADDR_ANY);
+ if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
+ &imr, sizeof (struct ip_mreq)) < 0)
+ {
+ close (ws);
+ close (rs);
+ report_file_error ("error adding membership", list2(name, dest));
+ }
+
+ /* Socket configuration for writing ----------------------- */
+
+ /* Normally, there's no 'connect' in multicast, since we prefer to use
+ 'sendto' and 'recvfrom'. However, in order to handle this connection in
+ the process-like way it is done for TCP, we must be able to use 'write'
+ instead of 'sendto'. Consequently, we 'connect' this socket. */
+
+ /* See open-network-stream-internal for comments on this part of the code */
+ slow_down_interrupts ();
+
+ loop:
+
+ /* A system call interrupted with a SIGALRM or SIGIO comes back
+ here, with can_break_system_calls reset to 0. */
+ SETJMP (break_system_call_jump);
+ if (QUITP)
+ {
+ speed_up_interrupts ();
+ REALLY_QUIT;
+ /* In case something really weird happens ... */
+ slow_down_interrupts ();
+ }
+
+ /* Break out of connect with a signal (it isn't otherwise possible).
+ Thus you don't get screwed with a hung network. */
+ can_break_system_calls = 1;
+ ret = connect (ws, (struct sockaddr *) &sa, sizeof (sa));
+ can_break_system_calls = 0;
+ if (ret == -1 && errno != EISCONN)
+ {
+ int xerrno = errno;
+
+ if (errno == EINTR)
+ goto loop;
+ if (errno == EADDRINUSE && retry < 20)
+ {
+ /* A delay here is needed on some FreeBSD systems,
+ and it is harmless, since this retrying takes time anyway
+ and should be infrequent.
+ `sleep-for' allowed for quitting this loop with interrupts
+ slowed down so it can't be used here. Async timers should
+ already be disabled at this point so we can use `sleep'. */
+ sleep (1);
+ retry++;
+ goto loop;
+ }
+
+ close (rs);
+ close (ws);
+ speed_up_interrupts ();
+
+ errno = xerrno;
+ report_file_error ("error connecting socket", list2(name, port));
+ }
+
+ speed_up_interrupts ();
+
+ /* scope */
+ if (setsockopt (ws, IPPROTO_IP, IP_MULTICAST_TTL,
+ &thettl, sizeof (thettl)) < 0)
+ {
+ close (rs);
+ close (ws);
+ report_file_error ("error setting ttl", list2(name, ttl));
+ }
+
+ set_socket_nonblocking_maybe (rs, theport, "udp");
+
+ *vinfd = (void*)rs;
+ *voutfd = (void*)ws;
+}
+
+#endif /* HAVE_MULTICAST */
+
+#endif /* HAVE_SOCKETS */
+
+\f
+/**********************************************************************/
+/* Initialization */
+/**********************************************************************/
+
+void
+process_type_create_unix (void)
+{
+ PROCESS_HAS_METHOD (unix, alloc_process_data);
+ PROCESS_HAS_METHOD (unix, mark_process_data);
+#ifdef SIGCHLD
+ PROCESS_HAS_METHOD (unix, init_process);
+ PROCESS_HAS_METHOD (unix, reap_exited_processes);
+#endif
+ PROCESS_HAS_METHOD (unix, init_process_io_handles);
+ PROCESS_HAS_METHOD (unix, create_process);
+ PROCESS_HAS_METHOD (unix, tooltalk_connection_p);
+ PROCESS_HAS_METHOD (unix, set_window_size);
+#ifdef HAVE_WAITPID
+ PROCESS_HAS_METHOD (unix, update_status_if_terminated);
+#endif
+ PROCESS_HAS_METHOD (unix, send_process);
+ PROCESS_HAS_METHOD (unix, process_send_eof);
+ PROCESS_HAS_METHOD (unix, deactivate_process);
+ PROCESS_HAS_METHOD (unix, kill_child_process);
+ PROCESS_HAS_METHOD (unix, kill_process_by_pid);
+ PROCESS_HAS_METHOD (unix, get_tty_name);
+#ifdef HAVE_SOCKETS
+ PROCESS_HAS_METHOD (unix, canonicalize_host_name);
+ PROCESS_HAS_METHOD (unix, open_network_stream);
+#ifdef HAVE_MULTICAST
+ PROCESS_HAS_METHOD (unix, open_multicast_group);
+#endif
+#endif
+}
+
+void
+vars_of_process_unix (void)
+{
+ Fprovide (intern ("unix-processes"));
+}
+
+#endif /* !defined (NO_SUBPROCESSES) */
projects / chise / xemacs-chise.git- / blobdiff