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

2 files changed, 24 insertions, 0 deletions

diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index 1d09eb8ef92..ebfbdf933f6 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -87,6 +87,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module pthread_sigmask:
   # Code from module readlink:
   # Code from module root-uid:
+  # Code from module sig2str:
   # Code from module signal-h:
   # Code from module snippet/_Noreturn:
   # Code from module snippet/arg-nonnull:
@@ -245,6 +246,11 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_READLINK
   fi
   gl_UNISTD_MODULE_INDICATOR([readlink])
+  gl_FUNC_SIG2STR
+  if test $ac_cv_func_sig2str = no; then
+    AC_LIBOBJ([sig2str])
+    gl_PREREQ_SIG2STR
+  fi
   gl_SIGNAL_H
   gl_TYPE_SOCKLEN_T
   gt_TYPE_SSIZE_T
@@ -681,6 +687,8 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/sha256.h
   lib/sha512.c
   lib/sha512.h
+  lib/sig2str.c
+  lib/sig2str.h
   lib/signal.in.h
   lib/stat-time.c
   lib/stat-time.h
@@ -760,6 +768,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/sha1.m4
   m4/sha256.m4
   m4/sha512.m4
+  m4/sig2str.m4
   m4/signal_h.m4
   m4/socklen.m4
   m4/ssize_t.m4
diff --git a/m4/sig2str.m4 b/m4/sig2str.m4
new file mode 100644
index 00000000000..43650b045e7
--- /dev/null
+++ b/m4/sig2str.m4
@@ -0,0 +1,15 @@
+# serial 7
+dnl Copyright (C) 2002, 2005-2006, 2009-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_SIG2STR],
+[
+  AC_CHECK_FUNCS([sig2str])
+])
+
+# Prerequisites of lib/sig2str.c.
+AC_DEFUN([gl_PREREQ_SIG2STR], [
+  :
+])