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(). */
224 const char *slave_name = NULL;
225 const char *clone = NULL;
226 static const char * const clones[] = /* Different pty master clone devices */
228 "/dev/ptmx", /* Various systems */
229 "/dev/ptm/clone", /* HPUX */
230 "/dev/ptc", /* AIX */
231 "/dev/ptmx_bsd" /* Tru64 */
234 #ifdef HAVE_GETPT /* glibc */
235 master_fd = getpt ();
238 #endif /* HAVE_GETPT */
241 #if defined(HAVE_OPENPTY) /* BSD, Tru64, glibc */
245 EMACS_BLOCK_SIGNAL (SIGCHLD);
246 rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
247 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
250 slave_name = ttyname (slave_fd);
252 goto have_slave_name;
262 #endif /* HAVE_OPENPTY */
264 #if defined(HAVE__GETPTY) && defined (O_NDELAY) /* SGI */
266 EMACS_BLOCK_SIGNAL (SIGCHLD);
267 slave_name = _getpty (&master_fd, O_RDWR | O_NDELAY, 0600, 0);
268 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
269 if (master_fd >= 0 && slave_name != NULL)
270 goto have_slave_name;
271 #endif /* HAVE__GETPTY */
273 /* Master clone devices are available on most systems */
276 for (i = 0; i < countof (clones); i++)
279 master_fd = open (clone, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
290 #if defined (HAVE_PTSNAME)
291 slave_name = ptsname (master_fd);
293 goto have_slave_name;
296 /* AIX docs say to use ttyname, not ptsname, to get slave_name */
298 && !strcmp (clone, "/dev/ptc")
299 && (slave_name = ttyname (master_fd)) != NULL)
300 goto have_slave_name;
305 strncpy (pty_name, slave_name, sizeof (pty_name));
306 pty_name[sizeof (pty_name) - 1] = '\0';
307 setup_pty (master_fd);
309 /* We jump through some hoops to frob the pty.
310 It's not obvious that checking the return code here is useful. */
312 /* "The grantpt() function will fail if it is unable to successfully
313 invoke the setuid root program. It may also fail if the
314 application has installed a signal handler to catch SIGCHLD
316 #if defined (HAVE_GRANTPT) || defined (HAVE_UNLOCKPT)
317 EMACS_BLOCK_SIGNAL (SIGCHLD);
319 #if defined (HAVE_GRANTPT)
322 /* grantpt() behavior on some versions of HP-UX differs from what's
323 specified in the man page: the group of the slave PTY is set to
324 the user's primary group, and we fix that. */
326 struct group *tty_group = getgrnam ("tty");
327 if (tty_group != NULL)
328 chown (pty_name, (uid_t) -1, tty_group->gr_gid);
330 #endif /* HPUX has broken grantpt() */
331 #endif /* HAVE_GRANTPT */
333 #if defined (HAVE_UNLOCKPT)
334 unlockpt (master_fd);
337 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
338 #endif /* HAVE_GRANTPT || HAVE_UNLOCKPT */
345 return allocate_pty_the_old_fashioned_way ();
348 /* This function tries to allocate a pty by iterating through file
349 pairs with names like /dev/ptyp1 and /dev/ttyp1. */
351 allocate_pty_the_old_fashioned_way (void)
355 /* Some systems name their pseudoterminals so that there are gaps in
356 the usual sequence - for example, on HP9000/S700 systems, there
357 are no pseudoterminals with names ending in 'f'. So we wait for
358 three failures in a row before deciding that we've reached the
360 int failed_count = 0;
368 # ifndef FIRST_PTY_LETTER
369 # define FIRST_PTY_LETTER 'p'
371 for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
372 for (i = 0; i < 16; i++)
373 #endif /* PTY_ITERATION */
376 #ifdef PTY_NAME_SPRINTF
379 sprintf (pty_name, "/dev/pty%c%x", c, i);
380 #endif /* no PTY_NAME_SPRINTF */
382 if (xemacs_stat (pty_name, &stb) < 0)
384 if (++failed_count >= 3)
389 fd = open (pty_name, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
393 #ifdef PTY_TTY_NAME_SPRINTF
396 sprintf (pty_name, "/dev/tty%c%x", c, i);
397 #endif /* no PTY_TTY_NAME_SPRINTF */
398 if (access (pty_name, R_OK | W_OK) == 0)
408 #endif /* HAVE_PTYS */
411 create_bidirectional_pipe (int *inchannel, int *outchannel,
412 volatile int *forkin, volatile int *forkout)
417 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
419 *outchannel = *inchannel = sv[0];
420 *forkout = *forkin = sv[1];
421 #else /* not SKTPAIR */
424 if (temp < 0) return -1;
428 if (temp < 0) return -1;
431 #endif /* not SKTPAIR */
438 #if !(defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO))
440 get_internet_address (Lisp_Object host, struct sockaddr_in *address,
443 struct hostent *host_info_ptr = NULL;
453 if (count++ > 10) break;
454 #ifndef BROKEN_CYGWIN
458 /* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */
459 slow_down_interrupts ();
460 host_info_ptr = gethostbyname ((char *) XSTRING_DATA (host));
461 speed_up_interrupts ();
463 if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
466 Fsleep_for (make_int (1));
470 address->sin_family = host_info_ptr->h_addrtype;
471 memcpy (&address->sin_addr, host_info_ptr->h_addr, host_info_ptr->h_length);
475 IN_ADDR numeric_addr;
476 /* Attempt to interpret host as numeric inet address */
477 numeric_addr = inet_addr ((char *) XSTRING_DATA (host));
478 if (NUMERIC_ADDR_ERROR)
480 maybe_error (Qprocess, errb,
481 "Unknown host \"%s\"", XSTRING_DATA (host));
485 /* There was some broken code here that called strlen() here
486 on (char *) &numeric_addr and even sometimes accessed
487 uninitialized data. */
488 address->sin_family = AF_INET;
489 * (IN_ADDR *) &address->sin_addr = numeric_addr;
494 #endif /* !(HAVE_GETADDRINFO && HAVE_GETNAMEINFO) */
497 set_socket_nonblocking_maybe (int fd, int port, const char* proto)
499 #ifdef PROCESS_IO_BLOCKING
502 for (tail = network_stream_blocking_port_list; CONSP (tail); tail = XCDR (tail))
504 Lisp_Object tail_port = XCAR (tail);
506 if (STRINGP (tail_port))
508 struct servent *svc_info;
509 CHECK_STRING (tail_port);
510 svc_info = getservbyname ((char *) XSTRING_DATA (tail_port), proto);
511 if ((svc_info != 0) && (svc_info->s_port == port))
516 else if (INTP (tail_port) && (htons ((unsigned short) XINT (tail_port)) == port))
522 set_descriptor_non_blocking (fd);
525 set_descriptor_non_blocking (fd);
526 #endif /* PROCESS_IO_BLOCKING */
529 #endif /* HAVE_SOCKETS */
531 /* Compute the Lisp form of the process status from
532 the numeric status that was returned by `wait'. */
535 update_status_from_wait_code (Lisp_Process *p, int *w_fmh)
537 /* C compiler lossage when attempting to pass w directly */
542 p->status_symbol = Qstop;
543 p->exit_code = WSTOPSIG (w);
546 else if (WIFEXITED (w))
548 p->status_symbol = Qexit;
549 p->exit_code = WEXITSTATUS (w);
552 else if (WIFSIGNALED (w))
554 p->status_symbol = Qsignal;
555 p->exit_code = WTERMSIG (w);
556 p->core_dumped = WCOREDUMP (w);
560 p->status_symbol = Qrun;
567 #define MAX_EXITED_PROCESSES 1000
568 static volatile pid_t exited_processes[MAX_EXITED_PROCESSES];
569 static volatile int exited_processes_status[MAX_EXITED_PROCESSES];
570 static volatile int exited_processes_index;
572 static volatile int sigchld_happened;
574 /* On receipt of a signal that a child status has changed,
575 loop asking about children with changed statuses until
576 the system says there are no more. All we do is record
577 the processes and wait status.
579 This function could be called from within the SIGCHLD
580 handler, so it must be completely reentrant. When
581 not called from a SIGCHLD handler, BLOCK_SIGCHLD should
582 be non-zero so that SIGCHLD is blocked while this
583 function is running. (This is necessary so avoid
584 race conditions with the SIGCHLD_HAPPENED flag). */
587 record_exited_processes (int block_sigchld)
589 if (!sigchld_happened)
594 #ifdef EMACS_BLOCK_SIGNAL
596 EMACS_BLOCK_SIGNAL (SIGCHLD);
599 while (sigchld_happened)
604 /* Keep trying to get a status until we get a definitive result. */
611 # endif /* not WUNTRACED */
613 pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED);
615 pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
617 #else /* not WNOHANG */
619 #endif /* not WNOHANG */
621 while (pid <= 0 && errno == EINTR);
626 if (exited_processes_index < MAX_EXITED_PROCESSES)
628 exited_processes[exited_processes_index] = pid;
629 exited_processes_status[exited_processes_index] = w;
630 exited_processes_index++;
633 /* On systems with WNOHANG, we just ignore the number
634 of times that SIGCHLD was signalled, and keep looping
635 until there are no more processes to wait on. If we
636 don't have WNOHANG, we have to rely on the count in
640 #endif /* not WNOHANG */
643 sigchld_happened = 0;
646 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
649 /* For any processes that have changed status and are recorded
650 and such, update the corresponding Lisp_Process.
651 We separate this from record_exited_processes() so that
652 we never have to call this function from within a signal
653 handler. We block SIGCHLD in case record_exited_processes()
654 is called from a signal handler. */
656 /** USG WARNING: Although it is not obvious from the documentation
657 in signal(2), on a USG system the SIGCLD handler MUST NOT call
658 signal() before executing at least one wait(), otherwise the handler
659 will be called again, resulting in an infinite loop. The relevant
660 portion of the documentation reads "SIGCLD signals will be queued
661 and the signal-catching function will be continually reentered until
662 the queue is empty". Invoking signal() causes the kernel to reexamine
663 the SIGCLD queue. Fred Fish, UniSoft Systems Inc.
665 (Note that now this only applies in SYS V Release 2 and before.
666 On SYS V Release 3, we use sigset() to set the signal handler for
667 the first time, and so we don't have to reestablish the signal handler
668 in the handler below. On SYS V Release 4, we don't get this weirdo
669 behavior when we use sigaction(), which we do use.) */
672 sigchld_handler (int signo)
674 #ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
675 int old_errno = errno;
678 record_exited_processes (0);
683 #ifdef HAVE_UNIXOID_EVENT_LOOP
684 signal_fake_event ();
686 /* WARNING - must come after wait3() for USG systems */
687 EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler);
693 #ifdef SIGNALS_VIA_CHARACTERS
694 /* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */
697 process_signal_char (int tty_fd, int signo)
699 /* If it's not a tty, pray that these default values work */
700 if (! isatty (tty_fd)) {
701 #define CNTL(ch) (037 & (ch))
704 case SIGINT: return CNTL ('C');
705 case SIGQUIT: return CNTL ('\\');
707 case SIGTSTP: return CNTL ('Z');
713 /* TERMIOS is the latest and bestest, and seems most likely to work.
714 If the system has it, use it. */
717 tcgetattr (tty_fd, &t);
720 case SIGINT: return t.c_cc[VINTR];
721 case SIGQUIT: return t.c_cc[VQUIT];
722 #if defined(SIGTSTP) && defined(VSUSP)
723 case SIGTSTP: return t.c_cc[VSUSP];
728 # elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */
730 /* On Berkeley descendants, the following IOCTL's retrieve the
731 current control characters. */
736 case SIGINT: ioctl (tty_fd, TIOCGETC, &c); return c.t_intrc;
737 case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c); return c.t_quitc;
739 case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc;
740 # endif /* SIGTSTP */
744 # elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
746 /* On SYSV descendants, the TCGETA ioctl retrieves the current
747 control characters. */
749 ioctl (tty_fd, TCGETA, &t);
751 case SIGINT: return t.c_cc[VINTR];
752 case SIGQUIT: return t.c_cc[VQUIT];
754 case SIGTSTP: return t.c_cc[VSWTCH];
755 # endif /* SIGTSTP */
758 # else /* ! defined (TCGETA) */
759 #error ERROR! Using SIGNALS_VIA_CHARACTERS, but not HAVE_TERMIOS || (TIOCGLTC && TIOCGETC) || TCGETA
760 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
761 you'd better be using one of the alternatives above! */
762 # endif /* ! defined (TCGETA) */
765 #endif /* SIGNALS_VIA_CHARACTERS */
770 /**********************************************************************/
771 /* Process implementation methods */
772 /**********************************************************************/
775 * Allocate and initialize Lisp_Process->process_data
779 unix_alloc_process_data (Lisp_Process *p)
781 p->process_data = xnew (struct unix_process_data);
783 UNIX_DATA(p)->connected_via_filedesc_p = 0;
784 UNIX_DATA(p)->infd = -1;
785 UNIX_DATA(p)->subtty = -1;
786 UNIX_DATA(p)->tty_name = Qnil;
787 UNIX_DATA(p)->pty_flag = 0;
791 * Mark any Lisp objects in Lisp_Process->process_data
795 unix_mark_process_data (Lisp_Process *proc)
797 mark_object (UNIX_DATA(proc)->tty_name);
801 * Initialize XEmacs process implementation once
806 unix_init_process (void)
809 if (! noninteractive || initialized)
811 signal (SIGCHLD, sigchld_handler);
816 * Initialize any process local data. This is called when newly
817 * created process is connected to real OS file handles. The
818 * handles are generally represented by void* type, but are
819 * of type int (file descriptors) for UNIX.
823 unix_init_process_io_handles (Lisp_Process *p, void* in, void* out, int flags)
825 UNIX_DATA(p)->infd = (int)in;
829 * Fork off a subprocess. P is a pointer to a newly created subprocess
830 * object. If this function signals, the caller is responsible for
831 * deleting (and finalizing) the process object.
833 * The method must return PID of the new process, a (positive??? ####) number
834 * which fits into Lisp_Int. No return value indicates an error, the method
835 * must signal an error instead.
839 unix_create_process (Lisp_Process *p,
840 Lisp_Object *argv, int nargv,
841 Lisp_Object program, Lisp_Object cur_dir)
846 /* Use volatile to protect variables from being clobbered by longjmp. */
847 volatile int forkin = -1;
848 volatile int forkout = -1;
849 volatile int pty_flag = 0;
852 if (!NILP (Vprocess_connection_type))
854 /* find a new pty, open the master side, return the opened
855 file handle, and store the name of the corresponding slave
856 side in global variable pty_name. */
857 outchannel = inchannel = allocate_pty ();
862 /* You're "supposed" to now open the slave in the child.
863 On some systems, we can open it here; this allows for
864 better error checking. */
866 /* On USG systems it does not work to open the pty's tty here
867 and then close and reopen it in the child. */
869 /* Don't let this terminal become our controlling terminal
870 (in case we don't have one). */
871 forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY | OPEN_BINARY, 0);
873 forkout = forkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
878 UNIX_DATA(p)->pty_flag = pty_flag = 1;
881 #endif /* HAVE_PTYS */
882 if (create_bidirectional_pipe (&inchannel, &outchannel,
883 &forkin, &forkout) < 0)
887 /* Replaced by close_process_descs */
888 set_exclusive_use (inchannel);
889 set_exclusive_use (outchannel);
892 set_descriptor_non_blocking (inchannel);
894 /* Record this as an active process, with its channels.
895 As a result, child_setup will close Emacs's side of the pipes. */
896 init_process_io_handles (p, (void*)inchannel, (void*)outchannel,
897 pty_flag ? STREAM_PTY_FLUSHING : 0);
898 /* Record the tty descriptor used in the subprocess. */
899 UNIX_DATA(p)->subtty = forkin;
903 /* child_setup must clobber environ on systems with true vfork.
904 Protect it from permanent change. */
905 char **save_environ = environ;
911 /**** Now we're in the child process ****/
912 int xforkin = forkin;
913 int xforkout = forkout;
915 /* Disconnect the current controlling terminal, pursuant to
916 making the pty be the controlling terminal of the process.
917 Also put us in our own process group. */
919 disconnect_controlling_terminal ();
924 /* Open the pty connection and make the pty's terminal
925 our controlling terminal.
927 On systems with TIOCSCTTY, we just use it to set
928 the controlling terminal. On other systems, the
929 first TTY we open becomes the controlling terminal.
930 So, we end up with four possibilities:
932 (1) on USG and TIOCSCTTY systems, we open the pty
934 (2) on other USG systems, we just open the pty.
935 (3) on non-USG systems with TIOCSCTTY, we
936 just use TIOCSCTTY. (On non-USG systems, we
937 already opened the pty in the parent process.)
938 (4) on non-USG systems without TIOCSCTTY, we
939 close the pty and reopen it.
941 This would be cleaner if we didn't open the pty
942 in the parent process, but doing it that way
943 makes it possible to trap error conditions.
944 It's harder to convey an error from the child
945 process, and I don't feel like messing with
948 /* There was some weirdo, probably wrong,
949 conditionalization on RTU and UNIPLUS here.
950 I deleted it. So sue me. */
952 /* SunOS has TIOCSCTTY but the close/open method
955 # if defined (USG) || !defined (TIOCSCTTY)
956 /* Now close the pty (if we had it open) and reopen it.
957 This makes the pty the controlling terminal of the
959 /* I wonder if close (open (pty_name, ...)) would work? */
962 xforkout = xforkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
965 write (1, "Couldn't open the pty terminal ", 31);
966 write (1, pty_name, strlen (pty_name));
970 # endif /* USG or not TIOCSCTTY */
972 /* Miscellaneous setup required for some systems.
973 Must be done before using tc* functions on xforkin.
974 This guarantees that isatty(xforkin) is true. */
976 # if defined (HAVE_ISASTREAM) && defined (I_PUSH)
977 if (isastream (xforkin))
979 # if defined (I_FIND)
980 # define stream_module_pushed(fd, module) (ioctl (fd, I_FIND, module) == 1)
982 # define stream_module_pushed(fd, module) 0
984 if (! stream_module_pushed (xforkin, "ptem"))
985 ioctl (xforkin, I_PUSH, "ptem");
986 if (! stream_module_pushed (xforkin, "ldterm"))
987 ioctl (xforkin, I_PUSH, "ldterm");
988 if (! stream_module_pushed (xforkin, "ttcompat"))
989 ioctl (xforkin, I_PUSH, "ttcompat");
991 # endif /* HAVE_ISASTREAM */
994 /* We ignore the return value
995 because faith@cs.unc.edu says that is necessary on Linux. */
996 assert (isatty (xforkin));
997 ioctl (xforkin, TIOCSCTTY, 0);
998 # endif /* TIOCSCTTY */
1000 /* Change the line discipline. */
1002 # if defined (HAVE_TERMIOS) && defined (LDISC1)
1005 assert (isatty (xforkin));
1006 tcgetattr (xforkin, &t);
1008 if (tcsetattr (xforkin, TCSANOW, &t) < 0)
1009 perror ("create_process/tcsetattr LDISC1 failed\n");
1011 # elif defined (NTTYDISC) && defined (TIOCSETD)
1013 /* Use new line discipline. TIOCSETD is accepted and
1014 ignored on Sys5.4 systems with ttcompat. */
1015 int ldisc = NTTYDISC;
1016 assert (isatty (xforkin));
1017 ioctl (xforkin, TIOCSETD, &ldisc);
1019 # endif /* TIOCSETD & NTTYDISC */
1021 /* Make our process group be the foreground group
1022 of our new controlling terminal. */
1025 pid_t piddly = EMACS_GET_PROCESS_GROUP ();
1026 EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly);
1029 /* On AIX, we've disabled SIGHUP above once we start a
1030 child on a pty. Now reenable it in the child, so it
1031 will die when we want it to.
1032 JV: This needs to be done ALWAYS as we might have inherited
1033 a SIG_IGN handling from our parent (nohup) and we are in new
1036 signal (SIGHUP, SIG_DFL);
1040 /* Set up the terminal characteristics of the pty. */
1041 child_setup_tty (xforkout);
1043 #endif /* HAVE_PTYS */
1045 signal (SIGINT, SIG_DFL);
1046 signal (SIGQUIT, SIG_DFL);
1050 char **new_argv = alloca_array (char *, nargv + 2);
1053 /* Nothing below here GCs so our string pointers shouldn't move. */
1054 new_argv[0] = (char *) XSTRING_DATA (program);
1055 for (i = 0; i < nargv; i++)
1057 CHECK_STRING (argv[i]);
1058 new_argv[i + 1] = (char *) XSTRING_DATA (argv[i]);
1060 new_argv[i + 1] = 0;
1062 LISP_STRING_TO_EXTERNAL (cur_dir, current_dir, Qfile_name);
1064 child_setup (xforkin, xforkout, xforkout, new_argv, current_dir);
1067 } /**** End of child code ****/
1069 /**** Back in parent process ****/
1070 #if !defined(CYGWIN)
1071 environ = save_environ;
1077 int save_errno = errno;
1078 close_descriptor_pair (forkin, forkout);
1080 report_file_error ("Doing fork", Qnil);
1083 /* #### dmoore - why is this commented out, otherwise we leave
1084 subtty = forkin, but then we close forkin just below. */
1085 /* UNIX_DATA(p)->subtty = -1; */
1087 /* If the subfork execv fails, and it exits,
1088 this close hangs. I don't know why.
1089 So have an interrupt jar it loose. */
1091 close_safely (forkin);
1092 if (forkin != forkout && forkout >= 0)
1097 UNIX_DATA (p)->tty_name = build_string (pty_name);
1100 UNIX_DATA (p)->tty_name = Qnil;
1102 /* Notice that SIGCHLD was not blocked. (This is not possible on
1103 some systems.) No biggie if SIGCHLD occurs right around the
1104 time that this call happens, because SIGCHLD() does not actually
1105 deselect the process (that doesn't occur until the next time
1106 we're waiting for an event, when status_notify() is called). */
1111 int save_errno = errno;
1112 close_descriptor_pair (forkin, forkout);
1113 close_descriptor_pair (inchannel, outchannel);
1115 report_file_error ("Opening pty or pipe", Qnil);
1116 return 0; /* not reached */
1120 /* Return nonzero if this process is a ToolTalk connection. */
1123 unix_tooltalk_connection_p (Lisp_Process *p)
1125 return UNIX_DATA(p)->connected_via_filedesc_p;
1128 /* This is called to set process' virtual terminal size */
1131 unix_set_window_size (Lisp_Process* p, int cols, int rows)
1133 return set_window_size (UNIX_DATA(p)->infd, cols, rows);
1137 * This method is called to update status fields of the process
1138 * structure. If the process has not existed, this method is
1139 * expected to do nothing.
1141 * The method is called only for real child processes.
1146 unix_update_status_if_terminated (Lisp_Process* p)
1150 EMACS_BLOCK_SIGNAL (SIGCHLD);
1152 if (waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid))
1155 update_status_from_wait_code (p, &w);
1158 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
1164 * Update status of all exited processes. Called when SIGCLD has signaled.
1169 unix_reap_exited_processes (void)
1174 #ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
1175 record_exited_processes (1);
1178 if (exited_processes_index <= 0)
1183 #ifdef EMACS_BLOCK_SIGNAL
1184 EMACS_BLOCK_SIGNAL (SIGCHLD);
1186 for (i = 0; i < exited_processes_index; i++)
1188 int pid = exited_processes[i];
1189 int w = exited_processes_status[i];
1191 /* Find the process that signaled us, and record its status. */
1196 LIST_LOOP (tail, Vprocess_list)
1198 Lisp_Object proc = XCAR (tail);
1199 p = XPROCESS (proc);
1200 if (INTP (p->pid) && XINT (p->pid) == pid)
1208 /* Change the status of the process that was found. */
1211 update_status_from_wait_code (p, &w);
1213 /* If process has terminated, stop waiting for its output. */
1214 if (WIFSIGNALED (w) || WIFEXITED (w))
1216 if (!NILP(p->pipe_instream))
1218 /* We can't just call event_stream->unselect_process_cb (p)
1219 here, because that calls XtRemoveInput, which is not
1220 necessarily reentrant, so we can't call this at interrupt
1228 /* There was no asynchronous process found for that id. Check
1229 if we have a synchronous process. Only set sync process status
1230 if there is one, so we work OK with the waitpid() call in
1231 wait_for_termination(). */
1232 if (synch_process_alive != 0)
1233 { /* Set the global sync process status variables. */
1234 synch_process_alive = 0;
1236 /* Report the status of the synchronous process. */
1238 synch_process_retcode = WEXITSTATUS (w);
1239 else if (WIFSIGNALED (w))
1240 synch_process_death = signal_name (WTERMSIG (w));
1245 exited_processes_index = 0;
1247 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
1249 #endif /* SIGCHLD */
1252 * Stuff the entire contents of LSTREAM to the process output pipe
1255 static JMP_BUF send_process_frame;
1258 send_process_trap (int signum)
1260 EMACS_REESTABLISH_SIGNAL (signum, send_process_trap);
1261 EMACS_UNBLOCK_SIGNAL (signum);
1262 LONGJMP (send_process_frame, 1);
1266 unix_send_process (Lisp_Object proc, struct lstream* lstream)
1268 /* Use volatile to protect variables from being clobbered by longjmp. */
1269 SIGTYPE (*volatile old_sigpipe) (int) = 0;
1270 volatile Lisp_Object vol_proc = proc;
1271 Lisp_Process *volatile p = XPROCESS (proc);
1273 /* #### JV: layering violation?
1275 This function knows too much about the relation between the encoding
1276 stream (DATA_OUTSTREAM) and the actual output stream p->output_stream.
1278 If encoding streams properly forwarded all calls, we could simply
1279 use DATA_OUTSTREAM everywhere. */
1281 if (!SETJMP (send_process_frame))
1283 /* use a reasonable-sized buffer (somewhere around the size of the
1284 stream buffer) so as to avoid inundating the stream with blocked
1286 Bufbyte chunkbuf[512];
1293 chunklen = Lstream_read (lstream, chunkbuf, 512);
1295 break; /* perhaps should abort() if < 0?
1296 This should never happen. */
1298 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
1299 /* Lstream_write() will never successfully write less than
1300 the amount sent in. In the worst case, it just buffers
1301 the unwritten data. */
1302 writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf,
1304 signal (SIGPIPE, old_sigpipe);
1306 /* This is a real error. Blocking errors are handled
1307 specially inside of the filedesc stream. */
1308 report_file_error ("writing to process", list1 (proc));
1309 while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream)))
1311 /* Buffer is full. Wait, accepting input;
1312 that may allow the program
1313 to finish doing output and read more. */
1314 Faccept_process_output (Qnil, make_int (1), Qnil);
1315 /* It could have *really* finished, deleting the process */
1316 if (NILP(p->pipe_outstream))
1319 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
1320 Lstream_flush (XLSTREAM (p->pipe_outstream));
1321 signal (SIGPIPE, old_sigpipe);
1326 { /* We got here from a longjmp() from the SIGPIPE handler */
1327 signal (SIGPIPE, old_sigpipe);
1328 /* Close the file lstream so we don't attempt to write to it further */
1329 /* #### There is controversy over whether this might cause fd leakage */
1330 /* my tests say no. -slb */
1331 XLSTREAM (p->pipe_outstream)->flags &= ~LSTREAM_FL_IS_OPEN;
1332 p->status_symbol = Qexit;
1333 p->exit_code = 256; /* #### SIGPIPE ??? */
1337 deactivate_process (*((Lisp_Object *) (&vol_proc)));
1338 invalid_operation ("SIGPIPE raised on process; closed it", p->name);
1341 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
1342 Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
1343 signal (SIGPIPE, old_sigpipe);
1347 * Send EOF to the process. The default implementation simply
1348 * closes the output stream. The method must return 0 to call
1349 * the default implementation, or 1 if it has taken all care about
1350 * sending EOF to the process.
1354 unix_process_send_eof (Lisp_Object proc)
1356 if (!UNIX_DATA (XPROCESS (proc))->pty_flag)
1359 /* #### get_eof_char simply doesn't return the correct character
1360 here. Maybe it is needed to determine the right eof
1361 character in init_process_io_handles but here it simply screws
1364 Bufbyte eof_char = get_eof_char (XPROCESS (proc));
1365 send_process (proc, Qnil, &eof_char, 0, 1);
1367 send_process (proc, Qnil, (const Bufbyte *) "\004", 0, 1);
1373 * Called before the process is deactivated. The process object
1374 * is not immediately finalized, just undergoes a transition to
1377 * The return value is a unique stream ID, as returned by
1378 * event_stream_delete_stream_pair
1380 * In the lack of this method, only event_stream_delete_stream_pair
1381 * is called on both I/O streams of the process.
1383 * The UNIX version guards this by ignoring possible SIGPIPE.
1387 unix_deactivate_process (Lisp_Process *p)
1389 SIGTYPE (*old_sigpipe) (int) = 0;
1392 if (UNIX_DATA(p)->infd >= 0)
1393 flush_pending_output (UNIX_DATA(p)->infd);
1395 /* closing the outstream could result in SIGPIPE, so ignore it. */
1396 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, SIG_IGN);
1397 usid = event_stream_delete_stream_pair (p->pipe_instream, p->pipe_outstream);
1398 signal (SIGPIPE, old_sigpipe);
1400 UNIX_DATA(p)->infd = -1;
1405 /* If the subtty field of the process data is not filled in, do so now. */
1407 try_to_initialize_subtty (struct unix_process_data *upd)
1410 && (upd->subtty == -1 || ! isatty (upd->subtty))
1411 && STRINGP (upd->tty_name))
1412 upd->subtty = open ((char *) XSTRING_DATA (upd->tty_name), O_RDWR, 0);
1415 /* Send signal number SIGNO to PROCESS.
1416 CURRENT_GROUP means send to the process group that currently owns
1417 the terminal being used to communicate with PROCESS.
1418 This is used for various commands in shell mode.
1419 If NOMSG is zero, insert signal-announcements into process's buffers
1422 If we can, we try to signal PROCESS by sending control characters
1423 down the pty. This allows us to signal inferiors who have changed
1424 their uid, for which killpg would return an EPERM error,
1425 or processes running on other machines via remote login.
1427 The method signals an error if the given SIGNO is not valid. */
1430 unix_kill_child_process (Lisp_Object proc, int signo,
1431 int current_group, int nomsg)
1434 Lisp_Process *p = XPROCESS (proc);
1435 struct unix_process_data *d = UNIX_DATA (p);
1441 p->status_symbol = Qrun;
1448 #endif /* ! defined (SIGCONT) */
1452 flush_pending_output (d->infd);
1459 /* If current_group is true, we want to send a signal to the
1460 foreground process group of the terminal our child process is
1461 running on. You would think that would be easy.
1463 The BSD people invented the TIOCPGRP ioctl to get the foreground
1464 process group of a tty. That, combined with killpg, gives us
1467 However, the POSIX standards people, in their infinite wisdom,
1468 have seen fit to only allow this for processes which have the
1469 terminal as controlling terminal, which doesn't apply to us.
1471 Sooo..., we have to do something non-standard. The ioctls
1472 TIOCSIGNAL, TIOCSIG, and TIOCSIGSEND send the signal directly on
1473 many systems. POSIX tcgetpgrp(), since it is *documented* as not
1474 doing what we want, is actually less likely to work than the BSD
1475 ioctl TIOCGPGRP it is supposed to obsolete. Sometimes we have to
1476 use TIOCGPGRP on the master end, sometimes the slave end
1477 (probably an AIX bug). So we better get a fd for the slave if we
1480 Anal operating systems like SGI Irix and Compaq Tru64 adhere
1481 strictly to the letter of the law, so our hack doesn't work.
1482 The following fragment from an Irix header file is suggestive:
1485 // this is not currently supported
1486 #define TIOCSIGNAL (tIOC|31) // pty: send signal to slave
1489 On those systems where none of our tricks work, we just fall back
1490 to the non-current_group behavior and kill the process group of
1495 try_to_initialize_subtty (d);
1497 #ifdef SIGNALS_VIA_CHARACTERS
1498 /* If possible, send signals to the entire pgrp
1499 by sending an input character to it. */
1501 char sigchar = process_signal_char (d->subtty, signo);
1504 send_process (proc, Qnil, (Bufbyte *) &sigchar, 0, 1);
1508 #endif /* SIGNALS_VIA_CHARACTERS */
1512 ioctl (d->infd, TIOCGPGRP, &pgid); /* BSD */
1513 if (pgid == -1 && d->subtty != -1)
1514 ioctl (d->subtty, TIOCGPGRP, &pgid); /* Only this works on AIX! */
1515 #endif /* TIOCGPGRP */
1519 /* Many systems provide an ioctl to send a signal directly */
1520 #ifdef TIOCSIGNAL /* Solaris, HP-UX */
1521 if (ioctl (d->infd, TIOCSIGNAL, signo) != -1)
1523 #endif /* TIOCSIGNAL */
1525 #ifdef TIOCSIG /* BSD */
1526 if (ioctl (d->infd, TIOCSIG, signo) != -1)
1528 #endif /* TIOCSIG */
1530 } /* current_group */
1533 /* Either current_group is 0, or we failed to get the foreground
1534 process group using the trickery above. So we fall back to
1535 sending the signal to the process group of our child process.
1536 Since this is often a shell that ignores signals like SIGINT,
1537 the shell's subprocess is killed, which is the desired effect.
1538 The process group of p->pid is always p->pid, since it was
1539 created as a process group leader. */
1540 pgid = XINT (p->pid);
1542 /* Finally send the signal. */
1543 if (EMACS_KILLPG (pgid, signo) == -1)
1544 error ("kill (%ld, %ld) failed: %s",
1545 (long) pgid, (long) signo, strerror (errno));
1548 /* Send signal SIGCODE to any process in the system given its PID.
1549 Return zero if successful, a negative number upon failure. */
1552 unix_kill_process_by_pid (int pid, int sigcode)
1554 return kill (pid, sigcode);
1557 /* Return TTY name used to communicate with subprocess. */
1560 unix_get_tty_name (Lisp_Process *p)
1562 return UNIX_DATA (p)->tty_name;
1565 /* Canonicalize host name HOST, and return its canonical form.
1566 The default implementation just takes HOST for a canonical name. */
1570 unix_canonicalize_host_name (Lisp_Object host)
1572 #if defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO)
1573 struct addrinfo hints, *res;
1574 static char addrbuf[NI_MAXHOST];
1575 Lisp_Object canonname;
1580 hints.ai_flags = AI_CANONNAME;
1581 hints.ai_family = AF_UNSPEC;
1582 hints.ai_socktype = SOCK_STREAM;
1583 hints.ai_protocol = 0;
1584 LISP_STRING_TO_EXTERNAL (host, ext_host, Qnative);
1585 retval = getaddrinfo (ext_host, NULL, &hints, &res);
1590 EXTERNAL_TO_C_STRING (gai_strerror (retval), gai_error, Qnative);
1591 maybe_error (Qprocess, ERROR_ME_NOT,
1592 "%s \"%s\"", gai_error, XSTRING_DATA (host));
1597 int gni = getnameinfo (res->ai_addr, res->ai_addrlen,
1598 addrbuf, sizeof(addrbuf),
1599 NULL, 0, NI_NUMERICHOST);
1600 canonname = gni ? host : build_ext_string (addrbuf, Qnative);
1606 #else /* ! HAVE_GETADDRINFO */
1607 struct sockaddr_in address;
1609 if (!get_internet_address (host, &address, ERROR_ME_NOT))
1612 if (address.sin_family == AF_INET)
1613 return build_string (inet_ntoa (address.sin_addr));
1615 /* #### any clue what to do here? */
1617 #endif /* ! HAVE_GETADDRINFO */
1620 /* Open a TCP network connection to a given HOST/SERVICE.
1621 Treated exactly like a normal process when reading and writing.
1622 Only differences are in status display and process deletion.
1623 A network connection has no PID; you cannot signal it. All you can
1624 do is deactivate and close it via delete-process. */
1627 unix_open_network_stream (Lisp_Object name, Lisp_Object host, Lisp_Object service,
1628 Lisp_Object protocol, void** vinfd, void** voutfd)
1634 volatile int retry = 0;
1637 CHECK_STRING (host);
1639 if (!EQ (protocol, Qtcp) && !EQ (protocol, Qudp))
1640 invalid_argument ("Unsupported protocol", protocol);
1643 #if defined(HAVE_GETADDRINFO) && defined(HAVE_GETNAMEINFO)
1644 struct addrinfo hints, *res;
1645 struct addrinfo * volatile lres;
1647 volatile int xerrno = 0;
1648 volatile int failed_connect = 0;
1651 * Caution: service can either be a string or int.
1652 * Convert to a C string for later use by getaddrinfo.
1657 snprintf (portbuf, sizeof (portbuf), "%ld", (long) XINT (service));
1658 portstring = portbuf;
1659 port = htons ((unsigned short) XINT (service));
1663 CHECK_STRING (service);
1664 LISP_STRING_TO_EXTERNAL (service, portstring, Qnative);
1670 hints.ai_family = AF_UNSPEC;
1671 if (EQ (protocol, Qtcp))
1672 hints.ai_socktype = SOCK_STREAM;
1673 else /* EQ (protocol, Qudp) */
1674 hints.ai_socktype = SOCK_DGRAM;
1675 hints.ai_protocol = 0;
1676 LISP_STRING_TO_EXTERNAL (host, ext_host, Qnative);
1677 retval = getaddrinfo (ext_host, portstring, &hints, &res);
1682 EXTERNAL_TO_C_STRING (gai_strerror (retval), gai_error, Qnative);
1683 error ("%s/%s %s", XSTRING_DATA (host), portstring, gai_error);
1687 for (lres = res; lres ; lres = lres->ai_next)
1689 if (EQ (protocol, Qtcp))
1690 s = socket (lres->ai_family, SOCK_STREAM, 0);
1691 else /* EQ (protocol, Qudp) */
1692 s = socket (lres->ai_family, SOCK_DGRAM, 0);
1697 /* Turn off interrupts here -- see comments below. There used to
1698 be code which called bind_polling_period() to slow the polling
1699 period down rather than turn it off, but that seems rather
1700 bogus to me. Best thing here is to use a non-blocking connect
1701 or something, to check for QUIT. */
1703 /* Comments that are not quite valid: */
1705 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1706 when connect is interrupted. So let's not let it get interrupted.
1707 Note we do not turn off polling, because polling is only used
1708 when not interrupt_input, and thus not normally used on the systems
1709 which have this bug. On systems which use polling, there's no way
1710 to quit if polling is turned off. */
1712 /* Slow down polling. Some kernels have a bug which causes retrying
1713 connect to fail after a connect. */
1715 slow_down_interrupts ();
1719 /* A system call interrupted with a SIGALRM or SIGIO comes back
1720 here, with can_break_system_calls reset to 0. */
1721 SETJMP (break_system_call_jump);
1724 speed_up_interrupts ();
1726 /* In case something really weird happens ... */
1727 slow_down_interrupts ();
1730 /* Break out of connect with a signal (it isn't otherwise possible).
1731 Thus you don't get screwed with a hung network. */
1732 can_break_system_calls = 1;
1733 retval = connect (s, lres->ai_addr, lres->ai_addrlen);
1734 can_break_system_calls = 0;
1738 if (errno != EISCONN)
1742 if (errno == EADDRINUSE && retry < 20)
1744 /* A delay here is needed on some FreeBSD systems,
1745 and it is harmless, since this retrying takes time anyway
1746 and should be infrequent.
1747 `sleep-for' allowed for quitting this loop with interrupts
1748 slowed down so it can't be used here. Async timers should
1749 already be disabled at this point so we can use `sleep'. */
1759 speed_up_interrupts ();
1767 char servbuf[NI_MAXSERV];
1769 if (EQ (protocol, Qtcp))
1770 gni = getnameinfo (lres->ai_addr, lres->ai_addrlen,
1771 NULL, 0, servbuf, sizeof(servbuf),
1773 else /* EQ (protocol, Qudp) */
1774 gni = getnameinfo (lres->ai_addr, lres->ai_addrlen,
1775 NULL, 0, servbuf, sizeof(servbuf),
1776 NI_NUMERICSERV | NI_DGRAM);
1779 port = strtol (servbuf, NULL, 10);
1783 } /* address loop */
1785 speed_up_interrupts ();
1793 report_file_error ("connection failed", list2 (host, name));
1795 report_file_error ("error creating socket", list1 (name));
1797 #else /* ! HAVE_GETADDRINFO */
1798 struct sockaddr_in address;
1801 port = htons ((unsigned short) XINT (service));
1804 struct servent *svc_info;
1805 CHECK_STRING (service);
1807 if (EQ (protocol, Qtcp))
1808 svc_info = getservbyname ((char *) XSTRING_DATA (service), "tcp");
1809 else /* EQ (protocol, Qudp) */
1810 svc_info = getservbyname ((char *) XSTRING_DATA (service), "udp");
1813 invalid_argument ("Unknown service", service);
1814 port = svc_info->s_port;
1817 get_internet_address (host, &address, ERROR_ME);
1818 address.sin_port = port;
1820 if (EQ (protocol, Qtcp))
1821 s = socket (address.sin_family, SOCK_STREAM, 0);
1822 else /* EQ (protocol, Qudp) */
1823 s = socket (address.sin_family, SOCK_DGRAM, 0);
1826 report_file_error ("error creating socket", list1 (name));
1828 /* Turn off interrupts here -- see comments below. There used to
1829 be code which called bind_polling_period() to slow the polling
1830 period down rather than turn it off, but that seems rather
1831 bogus to me. Best thing here is to use a non-blocking connect
1832 or something, to check for QUIT. */
1834 /* Comments that are not quite valid: */
1836 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1837 when connect is interrupted. So let's not let it get interrupted.
1838 Note we do not turn off polling, because polling is only used
1839 when not interrupt_input, and thus not normally used on the systems
1840 which have this bug. On systems which use polling, there's no way
1841 to quit if polling is turned off. */
1843 /* Slow down polling. Some kernels have a bug which causes retrying
1844 connect to fail after a connect. */
1846 slow_down_interrupts ();
1850 /* A system call interrupted with a SIGALRM or SIGIO comes back
1851 here, with can_break_system_calls reset to 0. */
1852 SETJMP (break_system_call_jump);
1855 speed_up_interrupts ();
1857 /* In case something really weird happens ... */
1858 slow_down_interrupts ();
1861 /* Break out of connect with a signal (it isn't otherwise possible).
1862 Thus you don't get screwed with a hung network. */
1863 can_break_system_calls = 1;
1864 retval = connect (s, (struct sockaddr *) &address, sizeof (address));
1865 can_break_system_calls = 0;
1866 if (retval == -1 && errno != EISCONN)
1871 if (errno == EADDRINUSE && retry < 20)
1873 /* A delay here is needed on some FreeBSD systems,
1874 and it is harmless, since this retrying takes time anyway
1875 and should be infrequent.
1876 `sleep-for' allowed for quitting this loop with interrupts
1877 slowed down so it can't be used here. Async timers should
1878 already be disabled at this point so we can use `sleep'. */
1886 speed_up_interrupts ();
1889 report_file_error ("connection failed", list2 (host, name));
1892 speed_up_interrupts ();
1893 #endif /* ! HAVE_GETADDRINFO */
1900 close (s); /* this used to be leaked; from Kyle Jones */
1901 report_file_error ("error duplicating socket", list1 (name));
1904 set_socket_nonblocking_maybe (inch, port, "tcp");
1906 *vinfd = (void*)inch;
1907 *voutfd = (void*)outch;
1911 #ifdef HAVE_MULTICAST
1913 /* Didier Verna <didier@xemacs.org> Nov. 28 1997.
1915 This function is similar to open-network-stream-internal, but provides a
1916 mean to open an UDP multicast connection instead of a TCP one. Like in the
1917 TCP case, the multicast connection will be seen as a sub-process,
1920 - Normally, we should use sendto and recvfrom with non connected
1921 sockets. The current code doesn't allow us to do this. In the future, it
1922 would be a good idea to extend the process data structure in order to deal
1923 properly with the different types network connections.
1924 - For the same reason, when leaving a multicast group, it is better to make
1925 a setsockopt - IP_DROP_MEMBERSHIP before closing the descriptors.
1926 Unfortunately, this can't be done here because delete_process doesn't know
1927 about the kind of connection we have. However, this is not such an
1932 unix_open_multicast_group (Lisp_Object name, Lisp_Object dest,
1933 Lisp_Object port, Lisp_Object ttl, void** vinfd,
1937 struct sockaddr_in sa;
1938 struct protoent *udp;
1941 unsigned char thettl;
1942 int one = 1; /* For REUSEADDR */
1944 volatile int retry = 0;
1946 CHECK_STRING (dest);
1948 CHECK_NATNUM (port);
1949 theport = htons ((unsigned short) XINT (port));
1952 thettl = (unsigned char) XINT (ttl);
1954 if ((udp = getprotobyname ("udp")) == NULL)
1955 type_error (Qinvalid_operation, "No info available for UDP protocol");
1957 /* Init the sockets. Yes, I need 2 sockets. I couldn't duplicate one. */
1958 if ((rs = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
1959 report_file_error ("error creating socket", list1(name));
1960 if ((ws = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
1963 report_file_error ("error creating socket", list1(name));
1966 /* This will be used for both sockets */
1967 memset (&sa, 0, sizeof(sa));
1968 sa.sin_family = AF_INET;
1969 sa.sin_port = theport;
1970 sa.sin_addr.s_addr = htonl (inet_addr ((char *) XSTRING_DATA (dest)));
1972 /* Socket configuration for reading ------------------------ */
1974 /* Multiple connections from the same machine. This must be done before
1975 bind. If it fails, it shouldn't be fatal. The only consequence is that
1976 people won't be able to connect twice from the same machine. */
1977 if (setsockopt (rs, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one))
1979 warn_when_safe (Qmulticast, Qwarning, "Cannot reuse socket address");
1981 /* bind socket name */
1982 if (bind (rs, (struct sockaddr *)&sa, sizeof(sa)))
1986 report_file_error ("error binding socket", list2(name, port));
1989 /* join multicast group */
1990 imr.imr_multiaddr.s_addr = htonl (inet_addr ((char *) XSTRING_DATA (dest)));
1991 imr.imr_interface.s_addr = htonl (INADDR_ANY);
1992 if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1993 &imr, sizeof (struct ip_mreq)) < 0)
1997 report_file_error ("error adding membership", list2(name, dest));
2000 /* Socket configuration for writing ----------------------- */
2002 /* Normally, there's no 'connect' in multicast, since we prefer to use
2003 'sendto' and 'recvfrom'. However, in order to handle this connection in
2004 the process-like way it is done for TCP, we must be able to use 'write'
2005 instead of 'sendto'. Consequently, we 'connect' this socket. */
2007 /* See open-network-stream-internal for comments on this part of the code */
2008 slow_down_interrupts ();
2012 /* A system call interrupted with a SIGALRM or SIGIO comes back
2013 here, with can_break_system_calls reset to 0. */
2014 SETJMP (break_system_call_jump);
2017 speed_up_interrupts ();
2019 /* In case something really weird happens ... */
2020 slow_down_interrupts ();
2023 /* Break out of connect with a signal (it isn't otherwise possible).
2024 Thus you don't get screwed with a hung network. */
2025 can_break_system_calls = 1;
2026 ret = connect (ws, (struct sockaddr *) &sa, sizeof (sa));
2027 can_break_system_calls = 0;
2028 if (ret == -1 && errno != EISCONN)
2034 if (errno == EADDRINUSE && retry < 20)
2036 /* A delay here is needed on some FreeBSD systems,
2037 and it is harmless, since this retrying takes time anyway
2038 and should be infrequent.
2039 `sleep-for' allowed for quitting this loop with interrupts
2040 slowed down so it can't be used here. Async timers should
2041 already be disabled at this point so we can use `sleep'. */
2049 speed_up_interrupts ();
2052 report_file_error ("error connecting socket", list2(name, port));
2055 speed_up_interrupts ();
2058 if (setsockopt (ws, IPPROTO_IP, IP_MULTICAST_TTL,
2059 &thettl, sizeof (thettl)) < 0)
2063 report_file_error ("error setting ttl", list2(name, ttl));
2066 set_socket_nonblocking_maybe (rs, theport, "udp");
2069 *voutfd = (void*)ws;
2072 #endif /* HAVE_MULTICAST */
2074 #endif /* HAVE_SOCKETS */
2077 /**********************************************************************/
2078 /* Initialization */
2079 /**********************************************************************/
2082 process_type_create_unix (void)
2084 PROCESS_HAS_METHOD (unix, alloc_process_data);
2085 PROCESS_HAS_METHOD (unix, mark_process_data);
2087 PROCESS_HAS_METHOD (unix, init_process);
2088 PROCESS_HAS_METHOD (unix, reap_exited_processes);
2090 PROCESS_HAS_METHOD (unix, init_process_io_handles);
2091 PROCESS_HAS_METHOD (unix, create_process);
2092 PROCESS_HAS_METHOD (unix, tooltalk_connection_p);
2093 PROCESS_HAS_METHOD (unix, set_window_size);
2095 PROCESS_HAS_METHOD (unix, update_status_if_terminated);
2097 PROCESS_HAS_METHOD (unix, send_process);
2098 PROCESS_HAS_METHOD (unix, process_send_eof);
2099 PROCESS_HAS_METHOD (unix, deactivate_process);
2100 PROCESS_HAS_METHOD (unix, kill_child_process);
2101 PROCESS_HAS_METHOD (unix, kill_process_by_pid);
2102 PROCESS_HAS_METHOD (unix, get_tty_name);
2104 PROCESS_HAS_METHOD (unix, canonicalize_host_name);
2105 PROCESS_HAS_METHOD (unix, open_network_stream);
2106 #ifdef HAVE_MULTICAST
2107 PROCESS_HAS_METHOD (unix, open_multicast_group);
2113 vars_of_process_unix (void)
2115 Fprovide (intern ("unix-processes"));
2118 #endif /* !defined (NO_SUBPROCESSES) */