Assume POSIX 1003.1-1988 or later for signal.h.

Exceptions: do not assume SIGCONT, SIGSTOP, SIGTSTP, SIGTTIN,
SIGTTOU, SIGUSR1, SIGUSR2, as Microsoft platforms lack these.
* admin/CPP-DEFINES (SIGALRM, SIGCHLD, SIGHUP, SIGKILL, SIGPIPE, SIGQUIT):
Remove.
(SIGTRAP): Remove this one too, as config.h no longer defines it.
* admin/merge-gnulib (GNULIB_MODULES): Add sig2str.
* configure.ac (PTY_OPEN, PTY_TTY_NAME_SPRINTF):
Use SIGCHLD rather than SIGCLD.
* lib/sig2str.c, lib/sig2str.h, m4/sig2str.m4: New files, from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* lib/makefile.w32-in (GNULIBOBJS): Add $(BUILD)/sig2str.$(O).
* src/process.c [subprocesses]: Include <c-ctype.h>, <sig2str.h>.
(deleted_pid_list, Fdelete_process, create_process)
(record_child_status_change, handle_child_signal, deliver_child_signal)
(init_process_emacs, syms_of_process):
Assume SIGCHLD is defined.
(parse_signal): Remove.  All uses removed.
(abbr_to_signal): New static function.
(Fsignal_process): Use it to convert signal names to ints.
* src/sysdep.c (sys_suspend) [!DOS_NT]: Use kill (0, ...) rather than
kill (getpgrp (), ...).
(emacs_sigaction_init): Assume SIGCHLD is defined.
(init_signals): Assume SIGALRM, SIGCHLD, SIGHUP, SIGKILL,
SIGPIPE, and SIGQUIT are defined.  Do not worry about SIGCLD any more.
* src/syssignal.h (EMACS_KILLPG): Remove.
All uses replaced by 'kill' with a negative pid.
(SIGCHLD): Remove definition, as we now assume SIGCHLD.
* src/w32proc.c (sys_kill): Support negative pids compatibly with POSIX.

Fixes: debbugs:13026

1 files changed, 4 insertions, 26 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index 9c904850401..5291c5d59aa 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -457,20 +457,15 @@ static void restore_signal_handlers (struct save_signal *);
 void
 sys_suspend (void)
 {
-#if defined (SIGTSTP) && !defined (MSDOS)
-
-  {
-    pid_t pgrp = getpgrp ();
-    EMACS_KILLPG (pgrp, SIGTSTP);
-  }
-
-#else /* No SIGTSTP */
+#ifndef DOS_NT
+  kill (0, SIGTSTP);
+#else
 /* On a system where suspending is not implemented,
    instead fork a subshell and let it talk directly to the terminal
    while we wait.  */
   sys_subshell ();
 
-#endif /* no SIGTSTP */
+#endif
 }
 
 /* Fork a subshell.  */
@@ -1518,9 +1513,7 @@ emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
   /* When handling a signal, block nonfatal system signals that are caught
      by Emacs.  This makes race conditions less likely.  */
   sigaddset (&action->sa_mask, SIGALRM);
-#ifdef SIGCHLD
   sigaddset (&action->sa_mask, SIGCHLD);
-#endif
 #ifdef SIGDANGER
   sigaddset (&action->sa_mask, SIGDANGER);
 #endif
@@ -1700,18 +1693,11 @@ init_signals (bool dumping)
 # ifdef SIGAIO
       sys_siglist[SIGAIO] = "LAN I/O interrupt";
 # endif
-# ifdef SIGALRM
       sys_siglist[SIGALRM] = "Alarm clock";
-# endif
 # ifdef SIGBUS
       sys_siglist[SIGBUS] = "Bus error";
 # endif
-# ifdef SIGCLD
-      sys_siglist[SIGCLD] = "Child status changed";
-# endif
-# ifdef SIGCHLD
       sys_siglist[SIGCHLD] = "Child status changed";
-# endif
 # ifdef SIGCONT
       sys_siglist[SIGCONT] = "Continued";
 # endif
@@ -1731,9 +1717,7 @@ init_signals (bool dumping)
 # ifdef SIGGRANT
       sys_siglist[SIGGRANT] = "Monitor mode granted";
 # endif
-# ifdef SIGHUP
       sys_siglist[SIGHUP] = "Hangup";
-# endif
       sys_siglist[SIGILL] = "Illegal instruction";
       sys_siglist[SIGINT] = "Interrupt";
 # ifdef SIGIO
@@ -1745,9 +1729,7 @@ init_signals (bool dumping)
 # ifdef SIGIOT
       sys_siglist[SIGIOT] = "IOT trap";
 # endif
-# ifdef SIGKILL
       sys_siglist[SIGKILL] = "Killed";
-# endif
 # ifdef SIGLOST
       sys_siglist[SIGLOST] = "Resource lost";
 # endif
@@ -1760,9 +1742,7 @@ init_signals (bool dumping)
 # ifdef SIGPHONE
       sys_siglist[SIGWIND] = "SIGPHONE";
 # endif
-# ifdef SIGPIPE
       sys_siglist[SIGPIPE] = "Broken pipe";
-# endif
 # ifdef SIGPOLL
       sys_siglist[SIGPOLL] = "Pollable event occurred";
 # endif
@@ -1775,9 +1755,7 @@ init_signals (bool dumping)
 # ifdef SIGPWR
       sys_siglist[SIGPWR] = "Power-fail restart";
 # endif
-# ifdef SIGQUIT
       sys_siglist[SIGQUIT] = "Quit";
-# endif
 # ifdef SIGRETRACT
       sys_siglist[SIGRETRACT] = "Need to relinquish monitor mode";
 # endif