1 /* Asynchronous subprocess implementation for UNIX
2 Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995
3 Free Software Foundation, Inc.
4 Copyright (C) 1995 Sun Microsystems, Inc.
5 Copyright (C) 1995, 1996 Ben Wing.
7 This file is part of XEmacs.
9 XEmacs is free software; you can redistribute it and/or modify it
10 under the terms of the GNU General Public License as published by the
11 Free Software Foundation; either version 2, or (at your option) any
14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with XEmacs; see the file COPYING. If not, write to
21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
24 /* This file has been Mule-ized except for `start-process-internal',
25 `open-network-stream-internal' and `open-multicast-group-internal'. */
27 /* This file has been split into process.c and process-unix.c by
28 Kirill M. Katsnelson <kkm@kis.ru>, so please bash him and not
29 the original author(s) */
31 /* The IPv6 support is derived from the code for GNU Emacs-20.3
32 written by Wolfgang S. Rupprecht */
36 #if !defined (NO_SUBPROCESSES)
38 /* The entire file is within this conditional */
53 #include "file-coding.h"
60 #include "syssignal.h" /* Always include before systty.h */
65 #include <grp.h> /* See grantpt fixups for HPUX below. */
69 * Implementation-specific data. Pointed to by Lisp_Process->process_data
72 struct unix_process_data
74 /* Non-0 if this is really a ToolTalk channel. */
75 int connected_via_filedesc_p;
76 /* Descriptor by which we read from this process. -1 for dead process */
78 /* Descriptor for the tty which this process is using.
79 -1 if we didn't record it (on some systems, there's no need). */
81 /* Name of subprocess terminal. */
83 /* Non-false if communicating through a pty. */
87 #define UNIX_DATA(p) ((struct unix_process_data*)((p)->process_data))
91 /**********************************************************************/
92 /* Static helper routines */
93 /**********************************************************************/
96 close_safely_handler (int signo)
98 EMACS_REESTABLISH_SIGNAL (signo, close_safely_handler);
103 close_safely (int fd)
106 signal (SIGALRM, close_safely_handler);
114 close_descriptor_pair (int in, int out)
118 if (out != in && out >= 0)
122 /* Close all descriptors currently in use for communication
123 with subprocess. This is used in a newly-forked subprocess
124 to get rid of irrelevant descriptors. */
127 close_process_descs_mapfun (const void* key, void* contents, void* arg)
130 CVOID_TO_LISP (proc, contents);
131 event_stream_delete_stream_pair (XPROCESS(proc)->pipe_instream,
132 XPROCESS(proc)->pipe_outstream);
136 /* #### This function is currently called from child_setup
137 in callproc.c. It should become static though - kkm */
139 close_process_descs (void)
141 maphash (close_process_descs_mapfun, usid_to_process, 0);
144 /* connect to an existing file descriptor. This is very similar to
145 open-network-stream except that it assumes that the connection has
146 already been initialized. It is currently used for ToolTalk
149 /* This function used to be visible on the Lisp level, but there is no
150 real point in doing that. Here is the doc string:
152 "Connect to an existing file descriptor.
153 Return a subprocess-object to represent the connection.
154 Input and output work as for subprocesses; `delete-process' closes it.
155 Args are NAME BUFFER INFD OUTFD.
156 NAME is name for process. It is modified if necessary to make it unique.
157 BUFFER is the buffer (or buffer-name) to associate with the process.
158 Process output goes at end of that buffer, unless you specify
159 an output stream or filter function to handle the output.
160 BUFFER may also be nil, meaning that this process is not associated
162 INFD and OUTFD specify the file descriptors to use for input and
163 output, respectively."
167 connect_to_file_descriptor (Lisp_Object name, Lisp_Object buffer,
168 Lisp_Object infd, Lisp_Object outfd)
170 /* This function can GC */
179 if (get_process_from_usid (FD_TO_USID (inch)))
180 invalid_operation ("There is already a process connected to fd", infd);
182 buffer = Fget_buffer_create (buffer);
183 proc = make_process_internal (name);
185 XPROCESS (proc)->pid = Fcons (infd, name);
186 XPROCESS (proc)->buffer = buffer;
187 init_process_io_handles (XPROCESS (proc), (void*)inch, (void*)XINT (outfd),
189 UNIX_DATA (XPROCESS (proc))->connected_via_filedesc_p = 1;
191 event_stream_select_process (XPROCESS (proc));
197 static int allocate_pty_the_old_fashioned_way (void);
199 /* The file name of the (slave) pty opened by allocate_pty(). */
200 #ifndef MAX_PTYNAME_LEN
201 #define MAX_PTYNAME_LEN 64
203 static char pty_name[MAX_PTYNAME_LEN];
205 /* Open an available pty, returning a file descriptor.
206 Return -1 on failure.
207 The file name of the terminal corresponding to the pty
208 is left in the variable `pty_name'. */
213 /* Unix98 standardized grantpt, unlockpt, and ptsname, but not the
214 functions required to open a master pty in the first place :-(
216 Modern Unix systems all seems to have convenience methods to open
217 a master pty fd in one function call, but there is little
218 agreement on how to do it.
220 allocate_pty() tries all the different known easy ways of opening
221 a pty. In case of failure, we resort to the old BSD-style pty
222 grovelling code in allocate_pty_the_old_fashioned_way(). */
223 #ifndef FORCE_ALLOCATE_PTY_THE_OLD_FASHIONED_WAY
225 const char *slave_name = NULL;
226 const char *clone = NULL;
227 static const char * const clones[] = /* Different pty master clone devices */
229 "/dev/ptmx", /* Various systems */
230 "/dev/ptm/clone", /* HPUX */
231 "/dev/ptc", /* AIX */
232 "/dev/ptmx_bsd" /* Tru64 */
235 #ifdef HAVE_GETPT /* glibc */
236 master_fd = getpt ();
239 #endif /* HAVE_GETPT */
242 #if defined(HAVE_OPENPTY) /* BSD, Tru64, glibc */
246 EMACS_BLOCK_SIGNAL (SIGCHLD);
247 rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
248 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
251 slave_name = ttyname (slave_fd);
253 goto have_slave_name;
263 #endif /* HAVE_OPENPTY */
265 #if defined(HAVE__GETPTY) && defined (O_NDELAY) /* SGI */
267 EMACS_BLOCK_SIGNAL (SIGCHLD);
268 slave_name = _getpty (&master_fd, O_RDWR | O_NDELAY, 0600, 0);
269 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
270 if (master_fd >= 0 && slave_name != NULL)
271 goto have_slave_name;
272 #endif /* HAVE__GETPTY */
274 /* Master clone devices are available on most systems */
277 for (i = 0; i < countof (clones); i++)
280 master_fd = open (clone, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
291 #if defined (HAVE_PTSNAME)
292 slave_name = ptsname (master_fd);
294 goto have_slave_name;
297 /* AIX docs say to use ttyname, not ptsname, to get slave_name */
299 && !strcmp (clone, "/dev/ptc")
300 && (slave_name = ttyname (master_fd)) != NULL)
301 goto have_slave_name;
306 strncpy (pty_name, slave_name, sizeof (pty_name));
307 pty_name[sizeof (pty_name) - 1] = '\0';
308 setup_pty (master_fd);
310 /* We jump through some hoops to frob the pty.
311 It's not obvious that checking the return code here is useful. */
313 /* "The grantpt() function will fail if it is unable to successfully
314 invoke the setuid root program. It may also fail if the
315 application has installed a signal handler to catch SIGCHLD
317 #if defined (HAVE_GRANTPT) || defined (HAVE_UNLOCKPT)
318 EMACS_BLOCK_SIGNAL (SIGCHLD);
320 #if defined (HAVE_GRANTPT)
323 /* grantpt() behavior on some versions of HP-UX differs from what's
324 specified in the man page: the group of the slave PTY is set to
325 the user's primary group, and we fix that. */
327 struct group *tty_group = getgrnam ("tty");
328 if (tty_group != NULL)
329 chown (pty_name, (uid_t) -1, tty_group->gr_gid);
331 #endif /* HPUX has broken grantpt() */
332 #endif /* HAVE_GRANTPT */
334 #if defined (HAVE_UNLOCKPT)
335 unlockpt (master_fd);
338 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
339 #endif /* HAVE_GRANTPT || HAVE_UNLOCKPT */
346 #endif /* ndef FORCE_ALLOCATE_PTY_THE_OLD_FASHIONED_WAY */
347 return allocate_pty_the_old_fashioned_way ();
350 /* This function tries to allocate a pty by iterating through file
351 pairs with names like /dev/ptyp1 and /dev/ttyp1. */
353 allocate_pty_the_old_fashioned_way (void)
357 /* Some systems name their pseudoterminals so that there are gaps in
358 the usual sequence - for example, on HP9000/S700 systems, there
359 are no pseudoterminals with names ending in 'f'. So we wait for
360 three failures in a row before deciding that we've reached the
362 int failed_count = 0;
370 # ifndef FIRST_PTY_LETTER
371 # define FIRST_PTY_LETTER 'p'
373 for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
374 for (i = 0; i < 16; i++)
375 #endif /* PTY_ITERATION */
378 #ifdef PTY_NAME_SPRINTF
381 sprintf (pty_name, "/dev/pty%c%x", c, i);
382 #endif /* no PTY_NAME_SPRINTF */
384 if (xemacs_stat (pty_name, &stb) < 0)
386 if (++failed_count >= 3)
391 fd = open (pty_name, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
395 #ifdef PTY_TTY_NAME_SPRINTF
398 sprintf (pty_name, "/dev/tty%c%x", c, i);
399 #endif /* no PTY_TTY_NAME_SPRINTF */
400 if (access (pty_name, R_OK | W_OK) == 0)
410 #endif /* HAVE_PTYS */
413 create_bidirectional_pipe (int *inchannel, int *outchannel,
414 volatile int *forkin, volatile int *forkout)
419 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
421 *outchannel = *inchannel = sv[0];
422 *forkout = *forkin = sv[1];
423 #else /* not SKTPAIR */
426 if (temp < 0) return -1;
430 if (temp < 0) return -1;
433 #endif /* not SKTPAIR */
440 #if !(defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO))
442 get_internet_address (Lisp_Object host, struct sockaddr_in *address,
445 struct hostent *host_info_ptr = NULL;
455 if (count++ > 10) break;
456 #ifndef BROKEN_CYGWIN
460 /* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */
461 slow_down_interrupts ();
462 host_info_ptr = gethostbyname ((char *) XSTRING_DATA (host));
463 speed_up_interrupts ();
465 if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
468 Fsleep_for (make_int (1));
472 address->sin_family = host_info_ptr->h_addrtype;
473 memcpy (&address->sin_addr, host_info_ptr->h_addr, host_info_ptr->h_length);
477 IN_ADDR numeric_addr;
478 /* Attempt to interpret host as numeric inet address */
479 numeric_addr = inet_addr ((char *) XSTRING_DATA (host));
480 if (NUMERIC_ADDR_ERROR)
482 maybe_error (Qprocess, errb,
483 "Unknown host \"%s\"", XSTRING_DATA (host));
487 /* There was some broken code here that called strlen() here
488 on (char *) &numeric_addr and even sometimes accessed
489 uninitialized data. */
490 address->sin_family = AF_INET;
491 * (IN_ADDR *) &address->sin_addr = numeric_addr;
496 #endif /* !(HAVE_GETADDRINFO && HAVE_GETNAMEINFO) */
499 set_socket_nonblocking_maybe (int fd, int port, const char* proto)
501 #ifdef PROCESS_IO_BLOCKING
504 for (tail = network_stream_blocking_port_list; CONSP (tail); tail = XCDR (tail))
506 Lisp_Object tail_port = XCAR (tail);
508 if (STRINGP (tail_port))
510 struct servent *svc_info;
511 CHECK_STRING (tail_port);
512 svc_info = getservbyname ((char *) XSTRING_DATA (tail_port), proto);
513 if ((svc_info != 0) && (svc_info->s_port == port))
518 else if (INTP (tail_port) && (htons ((unsigned short) XINT (tail_port)) == port))
524 set_descriptor_non_blocking (fd);
527 set_descriptor_non_blocking (fd);
528 #endif /* PROCESS_IO_BLOCKING */
531 #endif /* HAVE_SOCKETS */
533 /* Compute the Lisp form of the process status from
534 the numeric status that was returned by `wait'. */
537 update_status_from_wait_code (Lisp_Process *p, int *w_fmh)
539 /* C compiler lossage when attempting to pass w directly */
544 p->status_symbol = Qstop;
545 p->exit_code = WSTOPSIG (w);
548 else if (WIFEXITED (w))
550 p->status_symbol = Qexit;
551 p->exit_code = WEXITSTATUS (w);
554 else if (WIFSIGNALED (w))
556 p->status_symbol = Qsignal;
557 p->exit_code = WTERMSIG (w);
558 p->core_dumped = WCOREDUMP (w);
562 p->status_symbol = Qrun;
569 #define MAX_EXITED_PROCESSES 1000
570 static volatile pid_t exited_processes[MAX_EXITED_PROCESSES];
571 static volatile int exited_processes_status[MAX_EXITED_PROCESSES];
572 static volatile int exited_processes_index;
574 static volatile int sigchld_happened;
576 /* On receipt of a signal that a child status has changed,
577 loop asking about children with changed statuses until
578 the system says there are no more. All we do is record
579 the processes and wait status.
581 This function could be called from within the SIGCHLD
582 handler, so it must be completely reentrant. When
583 not called from a SIGCHLD handler, BLOCK_SIGCHLD should
584 be non-zero so that SIGCHLD is blocked while this
585 function is running. (This is necessary so avoid
586 race conditions with the SIGCHLD_HAPPENED flag). */
589 record_exited_processes (int block_sigchld)
591 if (!sigchld_happened)
596 #ifdef EMACS_BLOCK_SIGNAL
598 EMACS_BLOCK_SIGNAL (SIGCHLD);
601 while (sigchld_happened)
606 /* Keep trying to get a status until we get a definitive result. */
613 # endif /* not WUNTRACED */
615 pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED);
617 pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
619 #else /* not WNOHANG */
621 #endif /* not WNOHANG */
623 while (pid <= 0 && errno == EINTR);
628 if (exited_processes_index < MAX_EXITED_PROCESSES)
630 exited_processes[exited_processes_index] = pid;
631 exited_processes_status[exited_processes_index] = w;
632 exited_processes_index++;
635 /* On systems with WNOHANG, we just ignore the number
636 of times that SIGCHLD was signalled, and keep looping
637 until there are no more processes to wait on. If we
638 don't have WNOHANG, we have to rely on the count in
642 #endif /* not WNOHANG */
645 sigchld_happened = 0;
648 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
651 /* For any processes that have changed status and are recorded
652 and such, update the corresponding Lisp_Process.
653 We separate this from record_exited_processes() so that
654 we never have to call this function from within a signal
655 handler. We block SIGCHLD in case record_exited_processes()
656 is called from a signal handler. */
658 /** USG WARNING: Although it is not obvious from the documentation
659 in signal(2), on a USG system the SIGCLD handler MUST NOT call
660 signal() before executing at least one wait(), otherwise the handler
661 will be called again, resulting in an infinite loop. The relevant
662 portion of the documentation reads "SIGCLD signals will be queued
663 and the signal-catching function will be continually reentered until
664 the queue is empty". Invoking signal() causes the kernel to reexamine
665 the SIGCLD queue. Fred Fish, UniSoft Systems Inc.
667 (Note that now this only applies in SYS V Release 2 and before.
668 On SYS V Release 3, we use sigset() to set the signal handler for
669 the first time, and so we don't have to reestablish the signal handler
670 in the handler below. On SYS V Release 4, we don't get this weirdo
671 behavior when we use sigaction(), which we do use.) */
674 sigchld_handler (int signo)
676 #ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
677 int old_errno = errno;
680 record_exited_processes (0);
685 #ifdef HAVE_UNIXOID_EVENT_LOOP
686 signal_fake_event ();
688 /* WARNING - must come after wait3() for USG systems */
689 EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler);
695 #ifdef SIGNALS_VIA_CHARACTERS
696 /* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */
699 process_signal_char (int tty_fd, int signo)
701 /* If it's not a tty, pray that these default values work */
702 if (! isatty (tty_fd)) {
703 #define CNTL(ch) (037 & (ch))
706 case SIGINT: return CNTL ('C');
707 case SIGQUIT: return CNTL ('\\');
709 case SIGTSTP: return CNTL ('Z');
715 /* TERMIOS is the latest and bestest, and seems most likely to work.
716 If the system has it, use it. */
719 tcgetattr (tty_fd, &t);
722 case SIGINT: return t.c_cc[VINTR];
723 case SIGQUIT: return t.c_cc[VQUIT];
724 #if defined(SIGTSTP) && defined(VSUSP)
725 case SIGTSTP: return t.c_cc[VSUSP];
730 # elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */
732 /* On Berkeley descendants, the following IOCTL's retrieve the
733 current control characters. */
738 case SIGINT: ioctl (tty_fd, TIOCGETC, &c); return c.t_intrc;
739 case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c); return c.t_quitc;
741 case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc;
742 # endif /* SIGTSTP */
746 # elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
748 /* On SYSV descendants, the TCGETA ioctl retrieves the current
749 control characters. */
751 ioctl (tty_fd, TCGETA, &t);
753 case SIGINT: return t.c_cc[VINTR];
754 case SIGQUIT: return t.c_cc[VQUIT];
756 case SIGTSTP: return t.c_cc[VSWTCH];
757 # endif /* SIGTSTP */
760 # else /* ! defined (TCGETA) */
761 #error ERROR! Using SIGNALS_VIA_CHARACTERS, but not HAVE_TERMIOS || (TIOCGLTC && TIOCGETC) || TCGETA
762 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
763 you'd better be using one of the alternatives above! */
764 # endif /* ! defined (TCGETA) */
767 #endif /* SIGNALS_VIA_CHARACTERS */
772 /**********************************************************************/
773 /* Process implementation methods */
774 /**********************************************************************/
777 * Allocate and initialize Lisp_Process->process_data
781 unix_alloc_process_data (Lisp_Process *p)
783 p->process_data = xnew (struct unix_process_data);
785 UNIX_DATA(p)->connected_via_filedesc_p = 0;
786 UNIX_DATA(p)->infd = -1;
787 UNIX_DATA(p)->subtty = -1;
788 UNIX_DATA(p)->tty_name = Qnil;
789 UNIX_DATA(p)->pty_flag = 0;
793 * Mark any Lisp objects in Lisp_Process->process_data
797 unix_mark_process_data (Lisp_Process *proc)
799 mark_object (UNIX_DATA(proc)->tty_name);
803 * Initialize XEmacs process implementation once
808 unix_init_process (void)
811 if (! noninteractive || initialized)
813 signal (SIGCHLD, sigchld_handler);
818 * Initialize any process local data. This is called when newly
819 * created process is connected to real OS file handles. The
820 * handles are generally represented by void* type, but are
821 * of type int (file descriptors) for UNIX.
825 unix_init_process_io_handles (Lisp_Process *p, void* in, void* out, int flags)
827 UNIX_DATA(p)->infd = (int)in;
831 * Fork off a subprocess. P is a pointer to a newly created subprocess
832 * object. If this function signals, the caller is responsible for
833 * deleting (and finalizing) the process object.
835 * The method must return PID of the new process, a (positive??? ####) number
836 * which fits into Lisp_Int. No return value indicates an error, the method
837 * must signal an error instead.
841 unix_create_process (Lisp_Process *p,
842 Lisp_Object *argv, int nargv,
843 Lisp_Object program, Lisp_Object cur_dir)
848 /* Use volatile to protect variables from being clobbered by longjmp. */
849 volatile int forkin = -1;
850 volatile int forkout = -1;
851 volatile int pty_flag = 0;
854 if (!NILP (Vprocess_connection_type))
856 /* find a new pty, open the master side, return the opened
857 file handle, and store the name of the corresponding slave
858 side in global variable pty_name. */
859 outchannel = inchannel = allocate_pty ();
864 /* You're "supposed" to now open the slave in the child.
865 On some systems, we can open it here; this allows for
866 better error checking. */
868 /* On USG systems it does not work to open the pty's tty here
869 and then close and reopen it in the child. */
871 /* Don't let this terminal become our controlling terminal
872 (in case we don't have one). */
873 forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY | OPEN_BINARY, 0);
875 forkout = forkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
880 UNIX_DATA(p)->pty_flag = pty_flag = 1;
883 #endif /* HAVE_PTYS */
884 if (create_bidirectional_pipe (&inchannel, &outchannel,
885 &forkin, &forkout) < 0)
889 /* Replaced by close_process_descs */
890 set_exclusive_use (inchannel);
891 set_exclusive_use (outchannel);
894 set_descriptor_non_blocking (inchannel);
896 /* Record this as an active process, with its channels.
897 As a result, child_setup will close Emacs's side of the pipes. */
898 init_process_io_handles (p, (void*)inchannel, (void*)outchannel,
899 pty_flag ? STREAM_PTY_FLUSHING : 0);
900 /* Record the tty descriptor used in the subprocess. */
901 UNIX_DATA(p)->subtty = forkin;
905 /* child_setup must clobber environ on systems with true vfork.
906 Protect it from permanent change. */
907 char **save_environ = environ;
913 /**** Now we're in the child process ****/
914 int xforkin = forkin;
915 int xforkout = forkout;
917 /* Disconnect the current controlling terminal, pursuant to
918 making the pty be the controlling terminal of the process.
919 Also put us in our own process group. */
921 disconnect_controlling_terminal ();
926 /* Open the pty connection and make the pty's terminal
927 our controlling terminal.
929 On systems with TIOCSCTTY, we just use it to set
930 the controlling terminal. On other systems, the
931 first TTY we open becomes the controlling terminal.
932 So, we end up with four possibilities:
934 (1) on USG and TIOCSCTTY systems, we open the pty
936 (2) on other USG systems, we just open the pty.
937 (3) on non-USG systems with TIOCSCTTY, we
938 just use TIOCSCTTY. (On non-USG systems, we
939 already opened the pty in the parent process.)
940 (4) on non-USG systems without TIOCSCTTY, we
941 close the pty and reopen it.
943 This would be cleaner if we didn't open the pty
944 in the parent process, but doing it that way
945 makes it possible to trap error conditions.
946 It's harder to convey an error from the child
947 process, and I don't feel like messing with
950 /* There was some weirdo, probably wrong,
951 conditionalization on RTU and UNIPLUS here.
952 I deleted it. So sue me. */
954 /* SunOS has TIOCSCTTY but the close/open method
957 # if defined (USG) || !defined (TIOCSCTTY)
958 /* Now close the pty (if we had it open) and reopen it.
959 This makes the pty the controlling terminal of the
961 /* I wonder if close (open (pty_name, ...)) would work? */
964 xforkout = xforkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
967 write (1, "Couldn't open the pty terminal ", 31);
968 write (1, pty_name, strlen (pty_name));
972 # endif /* USG or not TIOCSCTTY */
974 /* Miscellaneous setup required for some systems.
975 Must be done before using tc* functions on xforkin.
976 This guarantees that isatty(xforkin) is true. */
978 # if defined (HAVE_ISASTREAM) && defined (I_PUSH)
979 if (isastream (xforkin))
981 # if defined (I_FIND)
982 # define stream_module_pushed(fd, module) (ioctl (fd, I_FIND, module) == 1)
984 # define stream_module_pushed(fd, module) 0
986 if (! stream_module_pushed (xforkin, "ptem"))
987 ioctl (xforkin, I_PUSH, "ptem");
988 if (! stream_module_pushed (xforkin, "ldterm"))
989 ioctl (xforkin, I_PUSH, "ldterm");
990 if (! stream_module_pushed (xforkin, "ttcompat"))
991 ioctl (xforkin, I_PUSH, "ttcompat");
993 # endif /* HAVE_ISASTREAM */
996 /* We ignore the return value
997 because faith@cs.unc.edu says that is necessary on Linux. */
998 assert (isatty (xforkin));
999 ioctl (xforkin, TIOCSCTTY, 0);
1000 # endif /* TIOCSCTTY */
1002 /* Change the line discipline. */
1004 # if defined (HAVE_TERMIOS) && defined (LDISC1)
1007 assert (isatty (xforkin));
1008 tcgetattr (xforkin, &t);
1010 if (tcsetattr (xforkin, TCSANOW, &t) < 0)
1011 perror ("create_process/tcsetattr LDISC1 failed\n");
1013 # elif defined (NTTYDISC) && defined (TIOCSETD)
1015 /* Use new line discipline. TIOCSETD is accepted and
1016 ignored on Sys5.4 systems with ttcompat. */
1017 int ldisc = NTTYDISC;
1018 assert (isatty (xforkin));
1019 ioctl (xforkin, TIOCSETD, &ldisc);
1021 # endif /* TIOCSETD & NTTYDISC */
1023 /* Make our process group be the foreground group
1024 of our new controlling terminal. */
1027 pid_t piddly = EMACS_GET_PROCESS_GROUP ();
1028 EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly);
1031 /* On AIX, we've disabled SIGHUP above once we start a
1032 child on a pty. Now reenable it in the child, so it
1033 will die when we want it to.
1034 JV: This needs to be done ALWAYS as we might have inherited
1035 a SIG_IGN handling from our parent (nohup) and we are in new
1038 signal (SIGHUP, SIG_DFL);
1042 /* Set up the terminal characteristics of the pty. */
1043 child_setup_tty (xforkout);
1045 #endif /* HAVE_PTYS */
1047 signal (SIGINT, SIG_DFL);
1048 signal (SIGQUIT, SIG_DFL);
1052 char **new_argv = alloca_array (char *, nargv + 2);
1055 /* Nothing below here GCs so our string pointers shouldn't move. */
1056 new_argv[0] = (char *) XSTRING_DATA (program);
1057 for (i = 0; i < nargv; i++)
1059 CHECK_STRING (argv[i]);
1060 new_argv[i + 1] = (char *) XSTRING_DATA (argv[i]);
1062 new_argv[i + 1] = 0;
1064 LISP_STRING_TO_EXTERNAL (cur_dir, current_dir, Qfile_name);
1066 child_setup (xforkin, xforkout, xforkout, new_argv, current_dir);
1069 } /**** End of child code ****/
1071 /**** Back in parent process ****/
1072 #if !defined(CYGWIN)
1073 environ = save_environ;
1079 int save_errno = errno;
1080 close_descriptor_pair (forkin, forkout);
1082 report_file_error ("Doing fork", Qnil);
1085 /* #### dmoore - why is this commented out, otherwise we leave
1086 subtty = forkin, but then we close forkin just below. */
1087 /* UNIX_DATA(p)->subtty = -1; */
1089 /* If the subfork execv fails, and it exits,
1090 this close hangs. I don't know why.
1091 So have an interrupt jar it loose. */
1093 close_safely (forkin);
1094 if (forkin != forkout && forkout >= 0)
1099 UNIX_DATA (p)->tty_name = build_string (pty_name);
1102 UNIX_DATA (p)->tty_name = Qnil;
1104 /* Notice that SIGCHLD was not blocked. (This is not possible on
1105 some systems.) No biggie if SIGCHLD occurs right around the
1106 time that this call happens, because SIGCHLD() does not actually
1107 deselect the process (that doesn't occur until the next time
1108 we're waiting for an event, when status_notify() is called). */
1113 int save_errno = errno;
1114 close_descriptor_pair (forkin, forkout);
1115 close_descriptor_pair (inchannel, outchannel);
1117 report_file_error ("Opening pty or pipe", Qnil);
1118 return 0; /* not reached */
1122 /* Return nonzero if this process is a ToolTalk connection. */
1125 unix_tooltalk_connection_p (Lisp_Process *p)
1127 return UNIX_DATA(p)->connected_via_filedesc_p;
1130 /* This is called to set process' virtual terminal size */
1133 unix_set_window_size (Lisp_Process* p, int cols, int rows)
1135 return set_window_size (UNIX_DATA(p)->infd, cols, rows);
1139 * This method is called to update status fields of the process
1140 * structure. If the process has not existed, this method is
1141 * expected to do nothing.
1143 * The method is called only for real child processes.
1148 unix_update_status_if_terminated (Lisp_Process* p)
1152 EMACS_BLOCK_SIGNAL (SIGCHLD);
1154 if (waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid))
1157 update_status_from_wait_code (p, &w);
1160 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
1166 * Update status of all exited processes. Called when SIGCLD has signaled.
1171 unix_reap_exited_processes (void)
1176 #ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
1177 record_exited_processes (1);
1180 if (exited_processes_index <= 0)
1185 #ifdef EMACS_BLOCK_SIGNAL
1186 EMACS_BLOCK_SIGNAL (SIGCHLD);
1188 for (i = 0; i < exited_processes_index; i++)
1190 int pid = exited_processes[i];
1191 int w = exited_processes_status[i];
1193 /* Find the process that signaled us, and record its status. */
1198 LIST_LOOP (tail, Vprocess_list)
1200 Lisp_Object proc = XCAR (tail);
1201 p = XPROCESS (proc);
1202 if (INTP (p->pid) && XINT (p->pid) == pid)
1210 /* Change the status of the process that was found. */
1213 update_status_from_wait_code (p, &w);
1215 /* If process has terminated, stop waiting for its output. */
1216 if (WIFSIGNALED (w) || WIFEXITED (w))
1218 if (!NILP(p->pipe_instream))
1220 /* We can't just call event_stream->unselect_process_cb (p)
1221 here, because that calls XtRemoveInput, which is not
1222 necessarily reentrant, so we can't call this at interrupt
1230 /* There was no asynchronous process found for that id. Check
1231 if we have a synchronous process. Only set sync process status
1232 if there is one, so we work OK with the waitpid() call in
1233 wait_for_termination(). */
1234 if (synch_process_alive != 0)
1235 { /* Set the global sync process status variables. */
1236 synch_process_alive = 0;
1238 /* Report the status of the synchronous process. */
1240 synch_process_retcode = WEXITSTATUS (w);
1241 else if (WIFSIGNALED (w))
1242 synch_process_death = signal_name (WTERMSIG (w));
1247 exited_processes_index = 0;
1249 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
1251 #endif /* SIGCHLD */
1254 * Stuff the entire contents of LSTREAM to the process output pipe
1257 static JMP_BUF send_process_frame;
1260 send_process_trap (int signum)
1262 EMACS_REESTABLISH_SIGNAL (signum, send_process_trap);
1263 EMACS_UNBLOCK_SIGNAL (signum);
1264 LONGJMP (send_process_frame, 1);
1268 unix_send_process (Lisp_Object proc, struct lstream* lstream)
1270 /* Use volatile to protect variables from being clobbered by longjmp. */
1271 SIGTYPE (*volatile old_sigpipe) (int) = 0;
1272 volatile Lisp_Object vol_proc = proc;
1273 Lisp_Process *volatile p = XPROCESS (proc);
1275 /* #### JV: layering violation?
1277 This function knows too much about the relation between the encoding
1278 stream (DATA_OUTSTREAM) and the actual output stream p->output_stream.
1280 If encoding streams properly forwarded all calls, we could simply
1281 use DATA_OUTSTREAM everywhere. */
1283 if (!SETJMP (send_process_frame))
1285 /* use a reasonable-sized buffer (somewhere around the size of the
1286 stream buffer) so as to avoid inundating the stream with blocked
1288 Bufbyte chunkbuf[512];
1293 Lstream_data_count writeret;
1295 chunklen = Lstream_read (lstream, chunkbuf, 512);
1297 break; /* perhaps should abort() if < 0?
1298 This should never happen. */
1300 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
1301 /* Lstream_write() will never successfully write less than
1302 the amount sent in. In the worst case, it just buffers
1303 the unwritten data. */
1304 writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf,
1306 signal (SIGPIPE, old_sigpipe);
1308 /* This is a real error. Blocking errors are handled
1309 specially inside of the filedesc stream. */
1310 report_file_error ("writing to process", list1 (proc));
1311 while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream)))
1313 /* Buffer is full. Wait, accepting input;
1314 that may allow the program
1315 to finish doing output and read more. */
1316 Faccept_process_output (Qnil, make_int (1), Qnil);
1317 /* It could have *really* finished, deleting the process */
1318 if (NILP(p->pipe_outstream))
1321 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
1322 Lstream_flush (XLSTREAM (p->pipe_outstream));
1323 signal (SIGPIPE, old_sigpipe);
1328 { /* We got here from a longjmp() from the SIGPIPE handler */
1329 signal (SIGPIPE, old_sigpipe);
1330 /* Close the file lstream so we don't attempt to write to it further */
1331 /* #### There is controversy over whether this might cause fd leakage */
1332 /* my tests say no. -slb */
1333 XLSTREAM (p->pipe_outstream)->flags &= ~LSTREAM_FL_IS_OPEN;
1334 p->status_symbol = Qexit;
1335 p->exit_code = 256; /* #### SIGPIPE ??? */
1339 deactivate_process (*((Lisp_Object *) (&vol_proc)));
1340 invalid_operation ("SIGPIPE raised on process; closed it", p->name);
1343 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
1344 Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
1345 signal (SIGPIPE, old_sigpipe);
1349 * Send EOF to the process. The default implementation simply
1350 * closes the output stream. The method must return 0 to call
1351 * the default implementation, or 1 if it has taken all care about
1352 * sending EOF to the process.
1356 unix_process_send_eof (Lisp_Object proc)
1358 if (!UNIX_DATA (XPROCESS (proc))->pty_flag)
1361 /* #### get_eof_char simply doesn't return the correct character
1362 here. Maybe it is needed to determine the right eof
1363 character in init_process_io_handles but here it simply screws
1366 Bufbyte eof_char = get_eof_char (XPROCESS (proc));
1367 send_process (proc, Qnil, &eof_char, 0, 1);
1369 send_process (proc, Qnil, (const Bufbyte *) "\004", 0, 1);
1375 * Called before the process is deactivated. The process object
1376 * is not immediately finalized, just undergoes a transition to
1379 * The return value is a unique stream ID, as returned by
1380 * event_stream_delete_stream_pair
1382 * In the lack of this method, only event_stream_delete_stream_pair
1383 * is called on both I/O streams of the process.
1385 * The UNIX version guards this by ignoring possible SIGPIPE.
1389 unix_deactivate_process (Lisp_Process *p)
1391 SIGTYPE (*old_sigpipe) (int) = 0;
1394 if (UNIX_DATA(p)->infd >= 0)
1395 flush_pending_output (UNIX_DATA(p)->infd);
1397 /* closing the outstream could result in SIGPIPE, so ignore it. */
1398 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, SIG_IGN);
1399 usid = event_stream_delete_stream_pair (p->pipe_instream, p->pipe_outstream);
1400 signal (SIGPIPE, old_sigpipe);
1402 UNIX_DATA(p)->infd = -1;
1407 /* If the subtty field of the process data is not filled in, do so now. */
1409 try_to_initialize_subtty (struct unix_process_data *upd)
1412 && (upd->subtty == -1 || ! isatty (upd->subtty))
1413 && STRINGP (upd->tty_name))
1414 upd->subtty = open ((char *) XSTRING_DATA (upd->tty_name), O_RDWR, 0);
1417 /* Send signal number SIGNO to PROCESS.
1418 CURRENT_GROUP means send to the process group that currently owns
1419 the terminal being used to communicate with PROCESS.
1420 This is used for various commands in shell mode.
1421 If NOMSG is zero, insert signal-announcements into process's buffers
1424 If we can, we try to signal PROCESS by sending control characters
1425 down the pty. This allows us to signal inferiors who have changed
1426 their uid, for which killpg would return an EPERM error,
1427 or processes running on other machines via remote login.
1429 The method signals an error if the given SIGNO is not valid. */
1432 unix_kill_child_process (Lisp_Object proc, int signo,
1433 int current_group, int nomsg)
1436 Lisp_Process *p = XPROCESS (proc);
1437 struct unix_process_data *d = UNIX_DATA (p);
1443 p->status_symbol = Qrun;
1450 #endif /* ! defined (SIGCONT) */
1454 flush_pending_output (d->infd);
1461 /* If current_group is true, we want to send a signal to the
1462 foreground process group of the terminal our child process is
1463 running on. You would think that would be easy.
1465 The BSD people invented the TIOCPGRP ioctl to get the foreground
1466 process group of a tty. That, combined with killpg, gives us
1469 However, the POSIX standards people, in their infinite wisdom,
1470 have seen fit to only allow this for processes which have the
1471 terminal as controlling terminal, which doesn't apply to us.
1473 Sooo..., we have to do something non-standard. The ioctls
1474 TIOCSIGNAL, TIOCSIG, and TIOCSIGSEND send the signal directly on
1475 many systems. POSIX tcgetpgrp(), since it is *documented* as not
1476 doing what we want, is actually less likely to work than the BSD
1477 ioctl TIOCGPGRP it is supposed to obsolete. Sometimes we have to
1478 use TIOCGPGRP on the master end, sometimes the slave end
1479 (probably an AIX bug). So we better get a fd for the slave if we
1482 Anal operating systems like SGI Irix and Compaq Tru64 adhere
1483 strictly to the letter of the law, so our hack doesn't work.
1484 The following fragment from an Irix header file is suggestive:
1487 // this is not currently supported
1488 #define TIOCSIGNAL (tIOC|31) // pty: send signal to slave
1491 On those systems where none of our tricks work, we just fall back
1492 to the non-current_group behavior and kill the process group of
1497 try_to_initialize_subtty (d);
1499 #ifdef SIGNALS_VIA_CHARACTERS
1500 /* If possible, send signals to the entire pgrp
1501 by sending an input character to it. */
1503 char sigchar = process_signal_char (d->subtty, signo);
1506 send_process (proc, Qnil, (Bufbyte *) &sigchar, 0, 1);
1510 #endif /* SIGNALS_VIA_CHARACTERS */
1514 ioctl (d->infd, TIOCGPGRP, &pgid); /* BSD */
1515 if (pgid == -1 && d->subtty != -1)
1516 ioctl (d->subtty, TIOCGPGRP, &pgid); /* Only this works on AIX! */
1517 #endif /* TIOCGPGRP */
1521 /* Many systems provide an ioctl to send a signal directly */
1522 #ifdef TIOCSIGNAL /* Solaris, HP-UX */
1523 if (ioctl (d->infd, TIOCSIGNAL, signo) != -1)
1525 #endif /* TIOCSIGNAL */
1527 #ifdef TIOCSIG /* BSD */
1528 if (ioctl (d->infd, TIOCSIG, signo) != -1)
1530 #endif /* TIOCSIG */
1532 } /* current_group */
1535 /* Either current_group is 0, or we failed to get the foreground
1536 process group using the trickery above. So we fall back to
1537 sending the signal to the process group of our child process.
1538 Since this is often a shell that ignores signals like SIGINT,
1539 the shell's subprocess is killed, which is the desired effect.
1540 The process group of p->pid is always p->pid, since it was
1541 created as a process group leader. */
1542 pgid = XINT (p->pid);
1544 /* Finally send the signal. */
1545 if (EMACS_KILLPG (pgid, signo) == -1)
1547 /* It's not an error if our victim is already dead.
1548 And we can't rely on the result of killing a zombie, since
1549 XPG 4.2 requires that killing a zombie fail with ESRCH,
1550 while FIPS 151-2 requires that it succeeds! */
1554 error ("kill (%ld, %ld) failed: %s",
1555 (long) pgid, (long) signo, strerror (errno));
1559 /* Send signal SIGCODE to any process in the system given its PID.
1560 Return zero if successful, a negative number upon failure. */
1563 unix_kill_process_by_pid (int pid, int sigcode)
1565 return kill (pid, sigcode);
1568 /* Return TTY name used to communicate with subprocess. */
1571 unix_get_tty_name (Lisp_Process *p)
1573 return UNIX_DATA (p)->tty_name;
1576 /* Canonicalize host name HOST, and return its canonical form.
1577 The default implementation just takes HOST for a canonical name. */
1581 unix_canonicalize_host_name (Lisp_Object host)
1583 #if defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO)
1584 struct addrinfo hints, *res;
1585 static char addrbuf[NI_MAXHOST];
1586 Lisp_Object canonname;
1591 hints.ai_flags = AI_CANONNAME;
1592 #ifdef IPV6_CANONICALIZE
1593 hints.ai_family = AF_UNSPEC;
1595 hints.ai_family = PF_INET;
1597 hints.ai_socktype = SOCK_STREAM;
1598 hints.ai_protocol = 0;
1599 LISP_STRING_TO_EXTERNAL (host, ext_host, Qnative);
1600 retval = getaddrinfo (ext_host, NULL, &hints, &res);
1605 EXTERNAL_TO_C_STRING (gai_strerror (retval), gai_error, Qnative);
1606 maybe_error (Qprocess, ERROR_ME_NOT,
1607 "%s \"%s\"", gai_error, XSTRING_DATA (host));
1612 int gni = getnameinfo (res->ai_addr, res->ai_addrlen,
1613 addrbuf, sizeof(addrbuf),
1614 NULL, 0, NI_NUMERICHOST);
1615 canonname = gni ? host : build_ext_string (addrbuf, Qnative);
1621 #else /* ! HAVE_GETADDRINFO */
1622 struct sockaddr_in address;
1624 if (!get_internet_address (host, &address, ERROR_ME_NOT))
1627 if (address.sin_family == AF_INET)
1628 return build_string (inet_ntoa (address.sin_addr));
1630 /* #### any clue what to do here? */
1632 #endif /* ! HAVE_GETADDRINFO */
1635 /* Open a TCP network connection to a given HOST/SERVICE.
1636 Treated exactly like a normal process when reading and writing.
1637 Only differences are in status display and process deletion.
1638 A network connection has no PID; you cannot signal it. All you can
1639 do is deactivate and close it via delete-process. */
1642 unix_open_network_stream (Lisp_Object name, Lisp_Object host, Lisp_Object service,
1643 Lisp_Object protocol, void** vinfd, void** voutfd)
1649 volatile int retry = 0;
1652 CHECK_STRING (host);
1654 if (!EQ (protocol, Qtcp) && !EQ (protocol, Qudp))
1655 invalid_argument ("Unsupported protocol", protocol);
1658 #if defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO)
1659 struct addrinfo hints, *res;
1660 struct addrinfo * volatile lres;
1662 volatile int xerrno = 0;
1663 volatile int failed_connect = 0;
1666 * Caution: service can either be a string or int.
1667 * Convert to a C string for later use by getaddrinfo.
1672 snprintf (portbuf, sizeof (portbuf), "%ld", (long) XINT (service));
1673 portstring = portbuf;
1674 port = htons ((unsigned short) XINT (service));
1678 CHECK_STRING (service);
1679 LISP_STRING_TO_EXTERNAL (service, portstring, Qnative);
1685 hints.ai_family = AF_UNSPEC;
1686 if (EQ (protocol, Qtcp))
1687 hints.ai_socktype = SOCK_STREAM;
1688 else /* EQ (protocol, Qudp) */
1689 hints.ai_socktype = SOCK_DGRAM;
1690 hints.ai_protocol = 0;
1691 LISP_STRING_TO_EXTERNAL (host, ext_host, Qnative);
1692 retval = getaddrinfo (ext_host, portstring, &hints, &res);
1697 EXTERNAL_TO_C_STRING (gai_strerror (retval), gai_error, Qnative);
1698 error ("%s/%s %s", XSTRING_DATA (host), portstring, gai_error);
1702 for (lres = res; lres ; lres = lres->ai_next)
1704 if (EQ (protocol, Qtcp))
1705 s = socket (lres->ai_family, SOCK_STREAM, 0);
1706 else /* EQ (protocol, Qudp) */
1707 s = socket (lres->ai_family, SOCK_DGRAM, 0);
1712 /* Turn off interrupts here -- see comments below. There used to
1713 be code which called bind_polling_period() to slow the polling
1714 period down rather than turn it off, but that seems rather
1715 bogus to me. Best thing here is to use a non-blocking connect
1716 or something, to check for QUIT. */
1718 /* Comments that are not quite valid: */
1720 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1721 when connect is interrupted. So let's not let it get interrupted.
1722 Note we do not turn off polling, because polling is only used
1723 when not interrupt_input, and thus not normally used on the systems
1724 which have this bug. On systems which use polling, there's no way
1725 to quit if polling is turned off. */
1727 /* Slow down polling. Some kernels have a bug which causes retrying
1728 connect to fail after a connect. */
1730 slow_down_interrupts ();
1734 /* A system call interrupted with a SIGALRM or SIGIO comes back
1735 here, with can_break_system_calls reset to 0. */
1736 SETJMP (break_system_call_jump);
1739 speed_up_interrupts ();
1741 /* In case something really weird happens ... */
1742 slow_down_interrupts ();
1745 /* Break out of connect with a signal (it isn't otherwise possible).
1746 Thus you don't get screwed with a hung network. */
1747 can_break_system_calls = 1;
1748 retval = connect (s, lres->ai_addr, lres->ai_addrlen);
1749 can_break_system_calls = 0;
1753 if (errno != EISCONN)
1757 if (errno == EADDRINUSE && retry < 20)
1759 /* A delay here is needed on some FreeBSD systems,
1760 and it is harmless, since this retrying takes time anyway
1761 and should be infrequent.
1762 `sleep-for' allowed for quitting this loop with interrupts
1763 slowed down so it can't be used here. Async timers should
1764 already be disabled at this point so we can use `sleep'. */
1775 speed_up_interrupts ();
1783 char servbuf[NI_MAXSERV];
1785 if (EQ (protocol, Qtcp))
1786 gni = getnameinfo (lres->ai_addr, lres->ai_addrlen,
1787 NULL, 0, servbuf, sizeof(servbuf),
1789 else /* EQ (protocol, Qudp) */
1790 gni = getnameinfo (lres->ai_addr, lres->ai_addrlen,
1791 NULL, 0, servbuf, sizeof(servbuf),
1792 NI_NUMERICSERV | NI_DGRAM);
1795 port = strtol (servbuf, NULL, 10);
1799 } /* address loop */
1801 speed_up_interrupts ();
1809 report_file_error ("connection failed", list2 (host, name));
1811 report_file_error ("error creating socket", list1 (name));
1813 #else /* ! HAVE_GETADDRINFO */
1814 struct sockaddr_in address;
1817 port = htons ((unsigned short) XINT (service));
1820 struct servent *svc_info;
1821 CHECK_STRING (service);
1823 if (EQ (protocol, Qtcp))
1824 svc_info = getservbyname ((char *) XSTRING_DATA (service), "tcp");
1825 else /* EQ (protocol, Qudp) */
1826 svc_info = getservbyname ((char *) XSTRING_DATA (service), "udp");
1829 invalid_argument ("Unknown service", service);
1830 port = svc_info->s_port;
1833 get_internet_address (host, &address, ERROR_ME);
1834 address.sin_port = port;
1836 if (EQ (protocol, Qtcp))
1837 s = socket (address.sin_family, SOCK_STREAM, 0);
1838 else /* EQ (protocol, Qudp) */
1839 s = socket (address.sin_family, SOCK_DGRAM, 0);
1842 report_file_error ("error creating socket", list1 (name));
1844 /* Turn off interrupts here -- see comments below. There used to
1845 be code which called bind_polling_period() to slow the polling
1846 period down rather than turn it off, but that seems rather
1847 bogus to me. Best thing here is to use a non-blocking connect
1848 or something, to check for QUIT. */
1850 /* Comments that are not quite valid: */
1852 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1853 when connect is interrupted. So let's not let it get interrupted.
1854 Note we do not turn off polling, because polling is only used
1855 when not interrupt_input, and thus not normally used on the systems
1856 which have this bug. On systems which use polling, there's no way
1857 to quit if polling is turned off. */
1859 /* Slow down polling. Some kernels have a bug which causes retrying
1860 connect to fail after a connect. */
1862 slow_down_interrupts ();
1866 /* A system call interrupted with a SIGALRM or SIGIO comes back
1867 here, with can_break_system_calls reset to 0. */
1868 SETJMP (break_system_call_jump);
1871 speed_up_interrupts ();
1873 /* In case something really weird happens ... */
1874 slow_down_interrupts ();
1877 /* Break out of connect with a signal (it isn't otherwise possible).
1878 Thus you don't get screwed with a hung network. */
1879 can_break_system_calls = 1;
1880 retval = connect (s, (struct sockaddr *) &address, sizeof (address));
1881 can_break_system_calls = 0;
1882 if (retval == -1 && errno != EISCONN)
1887 if (errno == EADDRINUSE && retry < 20)
1889 /* A delay here is needed on some FreeBSD systems,
1890 and it is harmless, since this retrying takes time anyway
1891 and should be infrequent.
1892 `sleep-for' allowed for quitting this loop with interrupts
1893 slowed down so it can't be used here. Async timers should
1894 already be disabled at this point so we can use `sleep'. */
1902 speed_up_interrupts ();
1905 report_file_error ("connection failed", list2 (host, name));
1908 speed_up_interrupts ();
1909 #endif /* ! HAVE_GETADDRINFO */
1916 close (s); /* this used to be leaked; from Kyle Jones */
1917 report_file_error ("error duplicating socket", list1 (name));
1920 set_socket_nonblocking_maybe (inch, port, "tcp");
1922 *vinfd = (void*)inch;
1923 *voutfd = (void*)outch;
1927 #ifdef HAVE_MULTICAST
1929 /* Didier Verna <didier@xemacs.org> Nov. 28 1997.
1931 This function is similar to open-network-stream-internal, but provides a
1932 mean to open an UDP multicast connection instead of a TCP one. Like in the
1933 TCP case, the multicast connection will be seen as a sub-process,
1936 - Normally, we should use sendto and recvfrom with non connected
1937 sockets. The current code doesn't allow us to do this. In the future, it
1938 would be a good idea to extend the process data structure in order to deal
1939 properly with the different types network connections.
1940 - For the same reason, when leaving a multicast group, it is better to make
1941 a setsockopt - IP_DROP_MEMBERSHIP before closing the descriptors.
1942 Unfortunately, this can't be done here because delete_process doesn't know
1943 about the kind of connection we have. However, this is not such an
1948 unix_open_multicast_group (Lisp_Object name, Lisp_Object dest,
1949 Lisp_Object port, Lisp_Object ttl, void** vinfd,
1953 struct sockaddr_in sa;
1954 struct protoent *udp;
1957 unsigned char thettl;
1958 int one = 1; /* For REUSEADDR */
1960 volatile int retry = 0;
1962 CHECK_STRING (dest);
1964 CHECK_NATNUM (port);
1965 theport = htons ((unsigned short) XINT (port));
1968 thettl = (unsigned char) XINT (ttl);
1970 if ((udp = getprotobyname ("udp")) == NULL)
1971 type_error (Qinvalid_operation, "No info available for UDP protocol");
1973 /* Init the sockets. Yes, I need 2 sockets. I couldn't duplicate one. */
1974 if ((rs = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
1975 report_file_error ("error creating socket", list1(name));
1976 if ((ws = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
1979 report_file_error ("error creating socket", list1(name));
1982 /* This will be used for both sockets */
1983 memset (&sa, 0, sizeof(sa));
1984 sa.sin_family = AF_INET;
1985 sa.sin_port = theport;
1986 sa.sin_addr.s_addr = inet_addr ((char *) XSTRING_DATA (dest));
1988 /* Socket configuration for reading ------------------------ */
1990 /* Multiple connections from the same machine. This must be done before
1991 bind. If it fails, it shouldn't be fatal. The only consequence is that
1992 people won't be able to connect twice from the same machine. */
1993 if (setsockopt (rs, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one))
1995 warn_when_safe (Qmulticast, Qwarning, "Cannot reuse socket address");
1997 /* bind socket name */
1998 if (bind (rs, (struct sockaddr *)&sa, sizeof(sa)))
2002 report_file_error ("error binding socket", list2(name, port));
2005 /* join multicast group */
2006 imr.imr_multiaddr.s_addr = inet_addr ((char *) XSTRING_DATA (dest));
2007 imr.imr_interface.s_addr = htonl (INADDR_ANY);
2008 if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
2009 &imr, sizeof (struct ip_mreq)) < 0)
2013 report_file_error ("error adding membership", list2(name, dest));
2016 /* Socket configuration for writing ----------------------- */
2018 /* Normally, there's no 'connect' in multicast, since we prefer to use
2019 'sendto' and 'recvfrom'. However, in order to handle this connection in
2020 the process-like way it is done for TCP, we must be able to use 'write'
2021 instead of 'sendto'. Consequently, we 'connect' this socket. */
2023 /* See open-network-stream-internal for comments on this part of the code */
2024 slow_down_interrupts ();
2028 /* A system call interrupted with a SIGALRM or SIGIO comes back
2029 here, with can_break_system_calls reset to 0. */
2030 SETJMP (break_system_call_jump);
2033 speed_up_interrupts ();
2035 /* In case something really weird happens ... */
2036 slow_down_interrupts ();
2039 /* Break out of connect with a signal (it isn't otherwise possible).
2040 Thus you don't get screwed with a hung network. */
2041 can_break_system_calls = 1;
2042 ret = connect (ws, (struct sockaddr *) &sa, sizeof (sa));
2043 can_break_system_calls = 0;
2044 if (ret == -1 && errno != EISCONN)
2050 if (errno == EADDRINUSE && retry < 20)
2052 /* A delay here is needed on some FreeBSD systems,
2053 and it is harmless, since this retrying takes time anyway
2054 and should be infrequent.
2055 `sleep-for' allowed for quitting this loop with interrupts
2056 slowed down so it can't be used here. Async timers should
2057 already be disabled at this point so we can use `sleep'. */
2065 speed_up_interrupts ();
2068 report_file_error ("error connecting socket", list2(name, port));
2071 speed_up_interrupts ();
2074 if (setsockopt (ws, IPPROTO_IP, IP_MULTICAST_TTL,
2075 &thettl, sizeof (thettl)) < 0)
2079 report_file_error ("error setting ttl", list2(name, ttl));
2082 set_socket_nonblocking_maybe (rs, theport, "udp");
2085 *voutfd = (void*)ws;
2088 #endif /* HAVE_MULTICAST */
2090 #endif /* HAVE_SOCKETS */
2093 /**********************************************************************/
2094 /* Initialization */
2095 /**********************************************************************/
2098 process_type_create_unix (void)
2100 PROCESS_HAS_METHOD (unix, alloc_process_data);
2101 PROCESS_HAS_METHOD (unix, mark_process_data);
2103 PROCESS_HAS_METHOD (unix, init_process);
2104 PROCESS_HAS_METHOD (unix, reap_exited_processes);
2106 PROCESS_HAS_METHOD (unix, init_process_io_handles);
2107 PROCESS_HAS_METHOD (unix, create_process);
2108 PROCESS_HAS_METHOD (unix, tooltalk_connection_p);
2109 PROCESS_HAS_METHOD (unix, set_window_size);
2111 PROCESS_HAS_METHOD (unix, update_status_if_terminated);
2113 PROCESS_HAS_METHOD (unix, send_process);
2114 PROCESS_HAS_METHOD (unix, process_send_eof);
2115 PROCESS_HAS_METHOD (unix, deactivate_process);
2116 PROCESS_HAS_METHOD (unix, kill_child_process);
2117 PROCESS_HAS_METHOD (unix, kill_process_by_pid);
2118 PROCESS_HAS_METHOD (unix, get_tty_name);
2120 PROCESS_HAS_METHOD (unix, canonicalize_host_name);
2121 PROCESS_HAS_METHOD (unix, open_network_stream);
2122 #ifdef HAVE_MULTICAST
2123 PROCESS_HAS_METHOD (unix, open_multicast_group);
2129 vars_of_process_unix (void)
2131 Fprovide (intern ("unix-processes"));
2134 #endif /* !defined (NO_SUBPROCESSES) */