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

4 files changed, 400 insertions, 3 deletions

diff --git a/lib/gnulib.mk b/lib/gnulib.mk
index 9d7cb281564..1335c80dae5 100644
--- a/lib/gnulib.mk
+++ b/lib/gnulib.mk
@@ -21,7 +21,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=at-internal --avoid=errno --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=openat-h --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings mktime pselect pthread_sigmask readlink socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub utimens warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --avoid=at-internal --avoid=errno --avoid=fchdir --avoid=fcntl --avoid=fstat --avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=openat-die --avoid=openat-h --avoid=raise --avoid=save-cwd --avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dtotimespec dup2 environ execinfo faccessat fcntl-h filemode getloadavg getopt-gnu gettime gettimeofday ignore-value intprops largefile lstat manywarnings mktime pselect pthread_sigmask readlink sig2str socklen stat-time stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time timer-time timespec-add timespec-sub utimens warnings
 
 
 MOSTLYCLEANFILES += core *.stackdump
@@ -457,6 +457,15 @@ EXTRA_DIST += root-uid.h
 
 ## end   gnulib module root-uid
 
+## begin gnulib module sig2str
+
+
+EXTRA_DIST += sig2str.c sig2str.h
+
+EXTRA_libgnu_a_SOURCES += sig2str.c
+
+## end   gnulib module sig2str
+
 ## begin gnulib module signal-h
 
 BUILT_SOURCES += signal.h
diff --git a/lib/makefile.w32-in b/lib/makefile.w32-in
index 67171e07900..348fe911a2a 100644
--- a/lib/makefile.w32-in
+++ b/lib/makefile.w32-in
@@ -1,4 +1,4 @@
-# -*- Makefile -*- for GNU Emacs on the Microsoft Windows API.
+2# -*- Makefile -*- for GNU Emacs on the Microsoft Windows API.
 # Copyright (C) 2011-2012 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
@@ -42,6 +42,7 @@ GNULIBOBJS = $(BLD)/c-ctype.$(O) \
              $(BLD)/sha1.$(O) \
              $(BLD)/sha256.$(O) \
              $(BLD)/sha512.$(O) \
+             $(BLD)/sig2str.$(O) \
              $(BLD)/stat-time.$(O) \
              $(BLD)/timespec.$(O) \
              $(BLD)/u64.$(O) \
@@ -322,4 +323,3 @@ getopt_h:
 
 execinfo.h: execinfo.in.h
         $(CP) execinfo.in.h $@
-
diff --git a/lib/sig2str.c b/lib/sig2str.c
new file mode 100644
index 00000000000..2f5b21cc36f
--- /dev/null
+++ b/lib/sig2str.c
@@ -0,0 +1,345 @@
+/* sig2str.c -- convert between signal names and numbers
+
+   Copyright (C) 2002, 2004, 2006, 2009-2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#include <config.h>
+
+#include <limits.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "sig2str.h"
+
+#ifndef SIGRTMIN
+# define SIGRTMIN 0
+# undef SIGRTMAX
+#endif
+#ifndef SIGRTMAX
+# define SIGRTMAX (SIGRTMIN - 1)
+#endif
+
+#define NUMNAME(name) { SIG##name, #name }
+
+/* Signal names and numbers.  Put the preferred name first.  */
+static struct numname { int num; char const name[8]; } numname_table[] =
+  {
+    /* Signals required by POSIX 1003.1-2001 base, listed in
+       traditional numeric order where possible.  */
+#ifdef SIGHUP
+    NUMNAME (HUP),
+#endif
+#ifdef SIGINT
+    NUMNAME (INT),
+#endif
+#ifdef SIGQUIT
+    NUMNAME (QUIT),
+#endif
+#ifdef SIGILL
+    NUMNAME (ILL),
+#endif
+#ifdef SIGTRAP
+    NUMNAME (TRAP),
+#endif
+#ifdef SIGABRT
+    NUMNAME (ABRT),
+#endif
+#ifdef SIGFPE
+    NUMNAME (FPE),
+#endif
+#ifdef SIGKILL
+    NUMNAME (KILL),
+#endif
+#ifdef SIGSEGV
+    NUMNAME (SEGV),
+#endif
+    /* On Haiku, SIGSEGV == SIGBUS, but we prefer SIGSEGV to match
+       strsignal.c output, so SIGBUS must be listed second.  */
+#ifdef SIGBUS
+    NUMNAME (BUS),
+#endif
+#ifdef SIGPIPE
+    NUMNAME (PIPE),
+#endif
+#ifdef SIGALRM
+    NUMNAME (ALRM),
+#endif
+#ifdef SIGTERM
+    NUMNAME (TERM),
+#endif
+#ifdef SIGUSR1
+    NUMNAME (USR1),
+#endif
+#ifdef SIGUSR2
+    NUMNAME (USR2),
+#endif
+#ifdef SIGCHLD
+    NUMNAME (CHLD),
+#endif
+#ifdef SIGURG
+    NUMNAME (URG),
+#endif
+#ifdef SIGSTOP
+    NUMNAME (STOP),
+#endif
+#ifdef SIGTSTP
+    NUMNAME (TSTP),
+#endif
+#ifdef SIGCONT
+    NUMNAME (CONT),
+#endif
+#ifdef SIGTTIN
+    NUMNAME (TTIN),
+#endif
+#ifdef SIGTTOU
+    NUMNAME (TTOU),
+#endif
+
+    /* Signals required by POSIX 1003.1-2001 with the XSI extension.  */
+#ifdef SIGSYS
+    NUMNAME (SYS),
+#endif
+#ifdef SIGPOLL
+    NUMNAME (POLL),
+#endif
+#ifdef SIGVTALRM
+    NUMNAME (VTALRM),
+#endif
+#ifdef SIGPROF
+    NUMNAME (PROF),
+#endif
+#ifdef SIGXCPU
+    NUMNAME (XCPU),
+#endif
+#ifdef SIGXFSZ
+    NUMNAME (XFSZ),
+#endif
+
+    /* Unix Version 7.  */
+#ifdef SIGIOT
+    NUMNAME (IOT),      /* Older name for ABRT.  */
+#endif
+#ifdef SIGEMT
+    NUMNAME (EMT),
+#endif
+
+    /* USG Unix.  */
+#ifdef SIGPHONE
+    NUMNAME (PHONE),
+#endif
+#ifdef SIGWIND
+    NUMNAME (WIND),
+#endif
+
+    /* Unix System V.  */
+#ifdef SIGCLD
+    NUMNAME (CLD),
+#endif
+#ifdef SIGPWR
+    NUMNAME (PWR),
+#endif
+
+    /* GNU/Linux 2.2 and Solaris 8.  */
+#ifdef SIGCANCEL
+    NUMNAME (CANCEL),
+#endif
+#ifdef SIGLWP
+    NUMNAME (LWP),
+#endif
+#ifdef SIGWAITING
+    NUMNAME (WAITING),
+#endif
+#ifdef SIGFREEZE
+    NUMNAME (FREEZE),
+#endif
+#ifdef SIGTHAW
+    NUMNAME (THAW),
+#endif
+#ifdef SIGLOST
+    NUMNAME (LOST),
+#endif
+#ifdef SIGWINCH
+    NUMNAME (WINCH),
+#endif
+
+    /* GNU/Linux 2.2.  */
+#ifdef SIGINFO
+    NUMNAME (INFO),
+#endif
+#ifdef SIGIO
+    NUMNAME (IO),
+#endif
+#ifdef SIGSTKFLT
+    NUMNAME (STKFLT),
+#endif
+
+    /* AIX 5L.  */
+#ifdef SIGDANGER
+    NUMNAME (DANGER),
+#endif
+#ifdef SIGGRANT
+    NUMNAME (GRANT),
+#endif
+#ifdef SIGMIGRATE
+    NUMNAME (MIGRATE),
+#endif
+#ifdef SIGMSG
+    NUMNAME (MSG),
+#endif
+#ifdef SIGPRE
+    NUMNAME (PRE),
+#endif
+#ifdef SIGRETRACT
+    NUMNAME (RETRACT),
+#endif
+#ifdef SIGSAK
+    NUMNAME (SAK),
+#endif
+#ifdef SIGSOUND
+    NUMNAME (SOUND),
+#endif
+
+    /* Older AIX versions.  */
+#ifdef SIGALRM1
+    NUMNAME (ALRM1),    /* unknown; taken from Bash 2.05 */
+#endif
+#ifdef SIGKAP
+    NUMNAME (KAP),      /* Older name for SIGGRANT.  */
+#endif
+#ifdef SIGVIRT
+    NUMNAME (VIRT),     /* unknown; taken from Bash 2.05 */
+#endif
+#ifdef SIGWINDOW
+    NUMNAME (WINDOW),   /* Older name for SIGWINCH.  */
+#endif
+
+    /* BeOS */
+#ifdef SIGKILLTHR
+    NUMNAME (KILLTHR),
+#endif
+
+    /* Older HP-UX versions.  */
+#ifdef SIGDIL
+    NUMNAME (DIL),
+#endif
+
+    /* Korn shell and Bash, of uncertain vintage.  */
+    { 0, "EXIT" }
+  };
+
+#define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0])
+
+/* ISDIGIT differs from isdigit, as follows:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char
+     or EOF.
+   - It's typically faster.
+   POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
+   isdigit unless it's important to use the locale's definition
+   of "digit" even when the host does not conform to POSIX.  */
+#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
+
+/* Convert the signal name SIGNAME to a signal number.  Return the
+   signal number if successful, -1 otherwise.  */
+
+static int
+str2signum (char const *signame)
+{
+  if (ISDIGIT (*signame))
+    {
+      char *endp;
+      long int n = strtol (signame, &endp, 10);
+      if (! *endp && n <= SIGNUM_BOUND)
+        return n;
+    }
+  else
+    {
+      unsigned int i;
+      for (i = 0; i < NUMNAME_ENTRIES; i++)
+        if (strcmp (numname_table[i].name, signame) == 0)
+          return numname_table[i].num;
+
+      {
+        char *endp;
+        int rtmin = SIGRTMIN;
+        int rtmax = SIGRTMAX;
+
+        if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0)
+          {
+            long int n = strtol (signame + 5, &endp, 10);
+            if (! *endp && 0 <= n && n <= rtmax - rtmin)
+              return rtmin + n;
+          }
+        else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0)
+          {
+            long int n = strtol (signame + 5, &endp, 10);
+            if (! *endp && rtmin - rtmax <= n && n <= 0)
+              return rtmax + n;
+          }
+      }
+    }
+
+  return -1;
+}
+
+/* Convert the signal name SIGNAME to the signal number *SIGNUM.
+   Return 0 if successful, -1 otherwise.  */
+
+int
+str2sig (char const *signame, int *signum)
+{
+  *signum = str2signum (signame);
+  return *signum < 0 ? -1 : 0;
+}
+
+/* Convert SIGNUM to a signal name in SIGNAME.  SIGNAME must point to
+   a buffer of at least SIG2STR_MAX bytes.  Return 0 if successful, -1
+   otherwise.  */
+
+int
+sig2str (int signum, char *signame)
+{
+  unsigned int i;
+  for (i = 0; i < NUMNAME_ENTRIES; i++)
+    if (numname_table[i].num == signum)
+      {
+        strcpy (signame, numname_table[i].name);
+        return 0;
+      }
+
+  {
+    int rtmin = SIGRTMIN;
+    int rtmax = SIGRTMAX;
+
+    if (! (rtmin <= signum && signum <= rtmax))
+      return -1;
+
+    if (signum <= rtmin + (rtmax - rtmin) / 2)
+      {
+        int delta = signum - rtmin;
+        sprintf (signame, delta ? "RTMIN+%d" : "RTMIN", delta);
+      }
+    else
+      {
+        int delta = rtmax - signum;
+        sprintf (signame, delta ? "RTMAX-%d" : "RTMAX", delta);
+      }
+
+    return 0;
+  }
+}
diff --git a/lib/sig2str.h b/lib/sig2str.h
new file mode 100644
index 00000000000..75eff7d7c1a
--- /dev/null
+++ b/lib/sig2str.h
@@ -0,0 +1,43 @@
+/* sig2str.h -- convert between signal names and numbers
+
+   Copyright (C) 2002, 2005, 2009-2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#include <signal.h>
+
+/* Don't override system declarations of SIG2STR_MAX, sig2str, str2sig.  */
+#ifndef SIG2STR_MAX
+
+# include "intprops.h"
+
+/* Size of a buffer needed to hold a signal name like "HUP".  */
+# define SIG2STR_MAX (sizeof "SIGRTMAX" + INT_STRLEN_BOUND (int) - 1)
+
+int sig2str (int, char *);
+int str2sig (char const *, int *);
+
+#endif
+
+/* An upper bound on signal numbers allowed by the system.  */
+
+#if defined _sys_nsig
+# define SIGNUM_BOUND (_sys_nsig - 1)
+#elif defined NSIG
+# define SIGNUM_BOUND (NSIG - 1)
+#else
+# define SIGNUM_BOUND 64
+#endif