Add gnulib support for pthread_sigmask.

* Makefile.in (GNULIB_MODULES): Add pthread_sigmask.
(GNULIB_TOOL_FLAGS): Avoid sigprocmask.  Emacs does its own
implementation of 'sigprocmask' on Windows, and it assumes
'sigprocmask' on non-Windows hosts, so it doesn't need the
sigprocmask module.
* lib/signal.in.h, m4/pthread_sigmask.m4, m4/signal_h.m4:
New files, automatically imported from gnulib.
* lib/gnulib.mk, m4/gl-comp.m4: Automatically-imported update
due to the above changes.
* .bzrignore: Add lib/signal.h.

7 files changed, 561 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 19dcf6818e3..0d69b94943e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2011-07-06  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Add gnulib support for pthread_sigmask.
+        * Makefile.in (GNULIB_MODULES): Add pthread_sigmask.
+        (GNULIB_TOOL_FLAGS): Avoid sigprocmask.  Emacs does its own
+        implementation of 'sigprocmask' on Windows, and it assumes
+        'sigprocmask' on non-Windows hosts, so it doesn't need the
+        sigprocmask module.
+        * lib/signal.in.h, m4/pthread_sigmask.m4, m4/signal_h.m4:
+        New files, automatically imported from gnulib.
+        * lib/gnulib.mk, m4/gl-comp.m4: Automatically-imported update
+        due to the above changes.
+        * .bzrignore: Add lib/signal.h.
+
 2011-07-05  Jan Djärv  <jan.h.d@swipnet.se>
 
         * configure.in (HAVE_GCONF): Allow both HAVE_GCONF and HAVE_GSETTINGS.
diff --git a/Makefile.in b/Makefile.in
index 457b5d6472e..07a2c6a017d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -335,9 +335,11 @@ GNULIB_MODULES = \
   alloca-opt \
   careadlinkat crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr \
   dup2 \
-  filemode getloadavg getopt-gnu ignore-value intprops lstat mktime readlink \
+  filemode getloadavg getopt-gnu ignore-value intprops lstat \
+  mktime pthread_sigmask readlink \
   socklen stdarg stdio strftime strtoumax symlink sys_stat
 GNULIB_TOOL_FLAGS = \
+ --avoid=sigprocmask \
  --conditional-dependencies --import --no-changelog --no-vc-files \
  --makefile-name=gnulib.mk
 sync-from-gnulib: $(gnulib_srcdir)
diff --git a/lib/gnulib.mk b/lib/gnulib.mk
index 18abe4536fa..88a7919b7af 100644
--- a/lib/gnulib.mk
+++ b/lib/gnulib.mk
@@ -9,7 +9,7 @@
 # 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=. --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt careadlinkat crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dup2 filemode getloadavg getopt-gnu ignore-value intprops lstat mktime readlink socklen stdarg stdio strftime strtoumax symlink sys_stat
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=. --avoid=sigprocmask --makefile-name=gnulib.mk --conditional-dependencies --no-libtool --macro-prefix=gl --no-vc-files alloca-opt careadlinkat crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr dup2 filemode getloadavg getopt-gnu ignore-value intprops lstat mktime pthread_sigmask readlink socklen stdarg stdio strftime strtoumax symlink sys_stat
 
 
 MOSTLYCLEANFILES += core *.stackdump
@@ -303,6 +303,44 @@ EXTRA_libgnu_a_SOURCES += readlink.c
 
 ## end   gnulib module readlink
 
+## begin gnulib module signal
+
+BUILT_SOURCES += signal.h
+
+# We need the following in order to create <signal.h> when the system
+# doesn't have a complete one.
+signal.h: signal.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
+        $(AM_V_GEN)rm -f $@-t $@ && \
+        { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
+          sed -e 's|@''GUARD_PREFIX''@|GL|g' \
+              -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
+              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
+              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
+              -e 's|@''NEXT_SIGNAL_H''@|$(NEXT_SIGNAL_H)|g' \
+              -e 's|@''GNULIB_PTHREAD_SIGMASK''@|$(GNULIB_PTHREAD_SIGMASK)|g' \
+              -e 's/@''GNULIB_SIGNAL_H_SIGPIPE''@/$(GNULIB_SIGNAL_H_SIGPIPE)/g' \
+              -e 's/@''GNULIB_SIGPROCMASK''@/$(GNULIB_SIGPROCMASK)/g' \
+              -e 's/@''GNULIB_SIGACTION''@/$(GNULIB_SIGACTION)/g' \
+              -e 's|@''HAVE_POSIX_SIGNALBLOCKING''@|$(HAVE_POSIX_SIGNALBLOCKING)|g' \
+              -e 's|@''HAVE_SIGSET_T''@|$(HAVE_SIGSET_T)|g' \
+              -e 's|@''HAVE_SIGINFO_T''@|$(HAVE_SIGINFO_T)|g' \
+              -e 's|@''HAVE_SIGACTION''@|$(HAVE_SIGACTION)|g' \
+              -e 's|@''HAVE_STRUCT_SIGACTION_SA_SIGACTION''@|$(HAVE_STRUCT_SIGACTION_SA_SIGACTION)|g' \
+              -e 's|@''HAVE_TYPE_VOLATILE_SIG_ATOMIC_T''@|$(HAVE_TYPE_VOLATILE_SIG_ATOMIC_T)|g' \
+              -e 's|@''HAVE_SIGHANDLER_T''@|$(HAVE_SIGHANDLER_T)|g' \
+              -e 's|@''REPLACE_PTHREAD_SIGMASK''@|$(REPLACE_PTHREAD_SIGMASK)|g' \
+              -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
+              -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
+              -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
+              < $(srcdir)/signal.in.h; \
+        } > $@-t && \
+        mv $@-t $@
+MOSTLYCLEANFILES += signal.h signal.h-t
+
+EXTRA_DIST += signal.in.h
+
+## end   gnulib module signal
+
 ## begin gnulib module stat
 
 if gl_GNULIB_ENABLED_stat
diff --git a/lib/signal.in.h b/lib/signal.in.h
new file mode 100644
index 00000000000..01987a7aff1
--- /dev/null
+++ b/lib/signal.in.h
@@ -0,0 +1,392 @@
+/* A GNU-like <signal.h>.
+
+   Copyright (C) 2006-2011 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/>.  */
+
+#if __GNUC__ >= 3
+@PRAGMA_SYSTEM_HEADER@
+#endif
+@PRAGMA_COLUMNS@
+
+#if defined __need_sig_atomic_t || defined __need_sigset_t
+/* Special invocation convention inside glibc header files.  */
+
+# @INCLUDE_NEXT@ @NEXT_SIGNAL_H@
+
+#else
+/* Normal invocation convention.  */
+
+#ifndef _@GUARD_PREFIX@_SIGNAL_H
+
+/* Define pid_t, uid_t.
+   Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.
+   On Solaris 10, <signal.h> includes <sys/types.h>, which eventually includes
+   us; so include <sys/types.h> now, before the second inclusion guard.  */
+#include <sys/types.h>
+
+/* The include_next requires a split double-inclusion guard.  */
+#@INCLUDE_NEXT@ @NEXT_SIGNAL_H@
+
+#ifndef _@GUARD_PREFIX@_SIGNAL_H
+#define _@GUARD_PREFIX@_SIGNAL_H
+
+/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
+
+/* The definition of _GL_ARG_NONNULL is copied here.  */
+
+/* The definition of _GL_WARN_ON_USE is copied here.  */
+
+/* On AIX, sig_atomic_t already includes volatile.  C99 requires that
+   'volatile sig_atomic_t' ignore the extra modifier, but C89 did not.
+   Hence, redefine this to a non-volatile type as needed.  */
+#if ! @HAVE_TYPE_VOLATILE_SIG_ATOMIC_T@
+# if !GNULIB_defined_sig_atomic_t
+typedef int rpl_sig_atomic_t;
+#  undef sig_atomic_t
+#  define sig_atomic_t rpl_sig_atomic_t
+#  define GNULIB_defined_sig_atomic_t 1
+# endif
+#endif
+
+/* A set or mask of signals.  */
+#if !@HAVE_SIGSET_T@
+# if !GNULIB_defined_sigset_t
+typedef unsigned int sigset_t;
+#  define GNULIB_defined_sigset_t 1
+# endif
+#endif
+
+/* Define sighandler_t, the type of signal handlers.  A GNU extension.  */
+#if !@HAVE_SIGHANDLER_T@
+# ifdef __cplusplus
+extern "C" {
+# endif
+# if !GNULIB_defined_sighandler_t
+typedef void (*sighandler_t) (int);
+#  define GNULIB_defined_sighandler_t 1
+# endif
+# ifdef __cplusplus
+}
+# endif
+#endif
+
+
+#if @GNULIB_SIGNAL_H_SIGPIPE@
+# ifndef SIGPIPE
+/* Define SIGPIPE to a value that does not overlap with other signals.  */
+#  define SIGPIPE 13
+#  define GNULIB_defined_SIGPIPE 1
+/* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask',
+   'write', 'stdio'.  */
+# endif
+#endif
+
+
+/* Maximum signal number + 1.  */
+#ifndef NSIG
+# if defined __TANDEM
+#  define NSIG 32
+# endif
+#endif
+
+
+#if @GNULIB_PTHREAD_SIGMASK@
+# if @REPLACE_PTHREAD_SIGMASK@
+#  undef pthread_sigmask
+#  define pthread_sigmask sigprocmask
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef pthread_sigmask
+# if HAVE_RAW_DECL_PTHREAD_SIGMASK
+_GL_WARN_ON_USE (pthread_sigmask, "pthread_sigmask is not portable - "
+                 "use gnulib module pthread_sigmask for portability");
+# endif
+#endif
+
+
+#if @GNULIB_SIGPROCMASK@
+# if !@HAVE_POSIX_SIGNALBLOCKING@
+
+/* Maximum signal number + 1.  */
+#  ifndef NSIG
+#   define NSIG 32
+#  endif
+
+/* This code supports only 32 signals.  */
+#  if !GNULIB_defined_verify_NSIG_constraint
+typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1];
+#   define GNULIB_defined_verify_NSIG_constraint 1
+#  endif
+
+# endif
+
+/* Test whether a given signal is contained in a signal set.  */
+# if @HAVE_POSIX_SIGNALBLOCKING@
+/* This function is defined as a macro on MacOS X.  */
+#  if defined __cplusplus && defined GNULIB_NAMESPACE
+#   undef sigismember
+#  endif
+# else
+_GL_FUNCDECL_SYS (sigismember, int, (const sigset_t *set, int sig)
+                                    _GL_ARG_NONNULL ((1)));
+# endif
+_GL_CXXALIAS_SYS (sigismember, int, (const sigset_t *set, int sig));
+_GL_CXXALIASWARN (sigismember);
+
+/* Initialize a signal set to the empty set.  */
+# if @HAVE_POSIX_SIGNALBLOCKING@
+/* This function is defined as a macro on MacOS X.  */
+#  if defined __cplusplus && defined GNULIB_NAMESPACE
+#   undef sigemptyset
+#  endif
+# else
+_GL_FUNCDECL_SYS (sigemptyset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
+# endif
+_GL_CXXALIAS_SYS (sigemptyset, int, (sigset_t *set));
+_GL_CXXALIASWARN (sigemptyset);
+
+/* Add a signal to a signal set.  */
+# if @HAVE_POSIX_SIGNALBLOCKING@
+/* This function is defined as a macro on MacOS X.  */
+#  if defined __cplusplus && defined GNULIB_NAMESPACE
+#   undef sigaddset
+#  endif
+# else
+_GL_FUNCDECL_SYS (sigaddset, int, (sigset_t *set, int sig)
+                                  _GL_ARG_NONNULL ((1)));
+# endif
+_GL_CXXALIAS_SYS (sigaddset, int, (sigset_t *set, int sig));
+_GL_CXXALIASWARN (sigaddset);
+
+/* Remove a signal from a signal set.  */
+# if @HAVE_POSIX_SIGNALBLOCKING@
+/* This function is defined as a macro on MacOS X.  */
+#  if defined __cplusplus && defined GNULIB_NAMESPACE
+#   undef sigdelset
+#  endif
+# else
+_GL_FUNCDECL_SYS (sigdelset, int, (sigset_t *set, int sig)
+                                  _GL_ARG_NONNULL ((1)));
+# endif
+_GL_CXXALIAS_SYS (sigdelset, int, (sigset_t *set, int sig));
+_GL_CXXALIASWARN (sigdelset);
+
+/* Fill a signal set with all possible signals.  */
+# if @HAVE_POSIX_SIGNALBLOCKING@
+/* This function is defined as a macro on MacOS X.  */
+#  if defined __cplusplus && defined GNULIB_NAMESPACE
+#   undef sigfillset
+#  endif
+# else
+_GL_FUNCDECL_SYS (sigfillset, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
+# endif
+_GL_CXXALIAS_SYS (sigfillset, int, (sigset_t *set));
+_GL_CXXALIASWARN (sigfillset);
+
+/* Return the set of those blocked signals that are pending.  */
+# if !@HAVE_POSIX_SIGNALBLOCKING@
+_GL_FUNCDECL_SYS (sigpending, int, (sigset_t *set) _GL_ARG_NONNULL ((1)));
+# endif
+_GL_CXXALIAS_SYS (sigpending, int, (sigset_t *set));
+_GL_CXXALIASWARN (sigpending);
+
+/* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
+   Then, if SET is not NULL, affect the current set of blocked signals by
+   combining it with *SET as indicated in OPERATION.
+   In this implementation, you are not allowed to change a signal handler
+   while the signal is blocked.  */
+# if !@HAVE_POSIX_SIGNALBLOCKING@
+#  define SIG_BLOCK   0  /* blocked_set = blocked_set | *set; */
+#  define SIG_SETMASK 1  /* blocked_set = *set; */
+#  define SIG_UNBLOCK 2  /* blocked_set = blocked_set & ~*set; */
+_GL_FUNCDECL_SYS (sigprocmask, int,
+                  (int operation, const sigset_t *set, sigset_t *old_set));
+# endif
+_GL_CXXALIAS_SYS (sigprocmask, int,
+                  (int operation, const sigset_t *set, sigset_t *old_set));
+_GL_CXXALIASWARN (sigprocmask);
+
+/* Install the handler FUNC for signal SIG, and return the previous
+   handler.  */
+# ifdef __cplusplus
+extern "C" {
+# endif
+# if !GNULIB_defined_function_taking_int_returning_void_t
+typedef void (*_gl_function_taking_int_returning_void_t) (int);
+#  define GNULIB_defined_function_taking_int_returning_void_t 1
+# endif
+# ifdef __cplusplus
+}
+# endif
+# if !@HAVE_POSIX_SIGNALBLOCKING@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   define signal rpl_signal
+#  endif
+_GL_FUNCDECL_RPL (signal, _gl_function_taking_int_returning_void_t,
+                  (int sig, _gl_function_taking_int_returning_void_t func));
+_GL_CXXALIAS_RPL (signal, _gl_function_taking_int_returning_void_t,
+                  (int sig, _gl_function_taking_int_returning_void_t func));
+# else
+_GL_CXXALIAS_SYS (signal, _gl_function_taking_int_returning_void_t,
+                  (int sig, _gl_function_taking_int_returning_void_t func));
+# endif
+_GL_CXXALIASWARN (signal);
+
+/* Raise signal SIG.  */
+# if !@HAVE_POSIX_SIGNALBLOCKING@ && GNULIB_defined_SIGPIPE
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef raise
+#   define raise rpl_raise
+#  endif
+_GL_FUNCDECL_RPL (raise, int, (int sig));
+_GL_CXXALIAS_RPL (raise, int, (int sig));
+# else
+_GL_CXXALIAS_SYS (raise, int, (int sig));
+# endif
+_GL_CXXALIASWARN (raise);
+
+#elif defined GNULIB_POSIXCHECK
+# undef sigaddset
+# if HAVE_RAW_DECL_SIGADDSET
+_GL_WARN_ON_USE (sigaddset, "sigaddset is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigdelset
+# if HAVE_RAW_DECL_SIGDELSET
+_GL_WARN_ON_USE (sigdelset, "sigdelset is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigemptyset
+# if HAVE_RAW_DECL_SIGEMPTYSET
+_GL_WARN_ON_USE (sigemptyset, "sigemptyset is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigfillset
+# if HAVE_RAW_DECL_SIGFILLSET
+_GL_WARN_ON_USE (sigfillset, "sigfillset is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigismember
+# if HAVE_RAW_DECL_SIGISMEMBER
+_GL_WARN_ON_USE (sigismember, "sigismember is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigpending
+# if HAVE_RAW_DECL_SIGPENDING
+_GL_WARN_ON_USE (sigpending, "sigpending is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+# undef sigprocmask
+# if HAVE_RAW_DECL_SIGPROCMASK
+_GL_WARN_ON_USE (sigprocmask, "sigprocmask is unportable - "
+                 "use the gnulib module sigprocmask for portability");
+# endif
+#endif /* @GNULIB_SIGPROCMASK@ */
+
+
+#if @GNULIB_SIGACTION@
+# if !@HAVE_SIGACTION@
+
+#  if !@HAVE_SIGINFO_T@
+
+#   if !GNULIB_defined_siginfo_types
+
+/* Present to allow compilation, but unsupported by gnulib.  */
+union sigval
+{
+  int sival_int;
+  void *sival_ptr;
+};
+
+/* Present to allow compilation, but unsupported by gnulib.  */
+struct siginfo_t
+{
+  int si_signo;
+  int si_code;
+  int si_errno;
+  pid_t si_pid;
+  uid_t si_uid;
+  void *si_addr;
+  int si_status;
+  long si_band;
+  union sigval si_value;
+};
+typedef struct siginfo_t siginfo_t;
+
+#    define GNULIB_defined_siginfo_types 1
+#   endif
+
+#  endif /* !@HAVE_SIGINFO_T@ */
+
+/* We assume that platforms which lack the sigaction() function also lack
+   the 'struct sigaction' type, and vice versa.  */
+
+#  if !GNULIB_defined_struct_sigaction
+
+struct sigaction
+{
+  union
+  {
+    void (*_sa_handler) (int);
+    /* Present to allow compilation, but unsupported by gnulib.  POSIX
+       says that implementations may, but not must, make sa_sigaction
+       overlap with sa_handler, but we know of no implementation where
+       they do not overlap.  */
+    void (*_sa_sigaction) (int, siginfo_t *, void *);
+  } _sa_func;
+  sigset_t sa_mask;
+  /* Not all POSIX flags are supported.  */
+  int sa_flags;
+};
+#   define sa_handler _sa_func._sa_handler
+#   define sa_sigaction _sa_func._sa_sigaction
+/* Unsupported flags are not present.  */
+#   define SA_RESETHAND 1
+#   define SA_NODEFER 2
+#   define SA_RESTART 4
+
+#   define GNULIB_defined_struct_sigaction 1
+#  endif
+
+_GL_FUNCDECL_SYS (sigaction, int, (int, const struct sigaction *restrict,
+                                   struct sigaction *restrict));
+
+# elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
+
+#  define sa_sigaction sa_handler
+
+# endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
+
+_GL_CXXALIAS_SYS (sigaction, int, (int, const struct sigaction *restrict,
+                                   struct sigaction *restrict));
+_GL_CXXALIASWARN (sigaction);
+
+#elif defined GNULIB_POSIXCHECK
+# undef sigaction
+# if HAVE_RAW_DECL_SIGACTION
+_GL_WARN_ON_USE (sigaction, "sigaction is unportable - "
+                 "use the gnulib module sigaction for portability");
+# endif
+#endif
+
+/* Some systems don't have SA_NODEFER.  */
+#ifndef SA_NODEFER
+# define SA_NODEFER 0
+#endif
+
+
+#endif /* _@GUARD_PREFIX@_SIGNAL_H */
+#endif /* _@GUARD_PREFIX@_SIGNAL_H */
+#endif
diff --git a/m4/gl-comp.m4 b/m4/gl-comp.m4
index 16bb02e686f..004c01a10a0 100644
--- a/m4/gl-comp.m4
+++ b/m4/gl-comp.m4
@@ -52,7 +52,9 @@ AC_DEFUN([gl_EARLY],
   # Code from module lstat:
   # Code from module mktime:
   # Code from module multiarch:
+  # Code from module pthread_sigmask:
   # Code from module readlink:
+  # Code from module signal:
   # Code from module socklen:
   # Code from module ssize_t:
   # Code from module stat:
@@ -140,12 +142,15 @@ if test $REPLACE_MKTIME = 1; then
 fi
 gl_TIME_MODULE_INDICATOR([mktime])
 gl_MULTIARCH
+gl_PTHREAD_SIGMASK
+gl_SIGNAL_MODULE_INDICATOR([pthread_sigmask])
 gl_FUNC_READLINK
 if test $HAVE_READLINK = 0 || test $REPLACE_READLINK = 1; then
   AC_LIBOBJ([readlink])
   gl_PREREQ_READLINK
 fi
 gl_UNISTD_MODULE_INDICATOR([readlink])
+gl_SIGNAL_H
 gl_TYPE_SOCKLEN_T
 gt_TYPE_SSIZE_T
 gl_STDARG_H
@@ -241,6 +246,9 @@ gl_STDLIB_MODULE_INDICATOR([strtoull])
   if test $REPLACE_LSTAT = 1; then
     func_gl_gnulib_m4code_stat
   fi
+  if test $REPLACE_PTHREAD_SIGMASK = 1; then
+    func_gl_gnulib_m4code_sigprocmask
+  fi
   if test $HAVE_READLINK = 0 || test $REPLACE_READLINK = 1; then
     func_gl_gnulib_m4code_stat
   fi
@@ -433,6 +441,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/sha256.h
   lib/sha512.c
   lib/sha512.h
+  lib/signal.in.h
   lib/stat.c
   lib/stdarg.in.h
   lib/stdbool.in.h
@@ -470,10 +479,12 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/md5.m4
   m4/mktime.m4
   m4/multiarch.m4
+  m4/pthread_sigmask.m4
   m4/readlink.m4
   m4/sha1.m4
   m4/sha256.m4
   m4/sha512.m4
+  m4/signal_h.m4
   m4/socklen.m4
   m4/ssize_t.m4
   m4/st_dm_mode.m4
diff --git a/m4/pthread_sigmask.m4 b/m4/pthread_sigmask.m4
new file mode 100644
index 00000000000..d25e2cc3e70
--- /dev/null
+++ b/m4/pthread_sigmask.m4
@@ -0,0 +1,26 @@
+# pthread_sigmask.m4 serial 2
+dnl Copyright (C) 2011 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_PTHREAD_SIGMASK],
+[
+  m4_ifdef([gl_THREADLIB], [
+    AC_REQUIRE([gl_THREADLIB])
+    if test "$gl_threads_api" = posix; then
+      gl_save_LIBS="$LIBS"
+      LIBS="$LIBS $LIBMULTITHREAD"
+      AC_CHECK_FUNCS([pthread_sigmask])
+      LIBS="$gl_save_LIBS"
+    else
+      ac_cv_func_pthread_sigmask=no
+    fi
+  ], [
+    AC_CHECK_FUNCS_ONCE([pthread_sigmask])
+  ])
+
+  if test $ac_cv_func_pthread_sigmask = no; then
+    REPLACE_PTHREAD_SIGMASK=1
+  fi
+])
diff --git a/m4/signal_h.m4 b/m4/signal_h.m4
new file mode 100644
index 00000000000..53972fba54f
--- /dev/null
+++ b/m4/signal_h.m4
@@ -0,0 +1,76 @@
+# signal_h.m4 serial 14
+dnl Copyright (C) 2007-2011 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_SIGNAL_H],
+[
+  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
+  AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T])
+  gl_NEXT_HEADERS([signal.h])
+
+# AIX declares sig_atomic_t to already include volatile, and C89 compilers
+# then choke on 'volatile sig_atomic_t'.  C99 requires that it compile.
+  AC_CHECK_TYPE([volatile sig_atomic_t], [],
+    [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
+#include <signal.h>
+    ]])
+
+  AC_REQUIRE([AC_TYPE_UID_T])
+
+  dnl Persuade glibc <signal.h> to define sighandler_t.
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+  AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
+#include <signal.h>
+    ]])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[#include <signal.h>
+    ]], [pthread_sigmask sigaction
+    sigaddset sigdelset sigemptyset sigfillset sigismember
+    sigpending sigprocmask])
+])
+
+AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
+[
+  AC_CHECK_TYPES([sigset_t],
+    [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
+    [[
+      #include <signal.h>
+      /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */
+      #include <sys/types.h>
+    ]])
+  if test $gl_cv_type_sigset_t != yes; then
+    HAVE_SIGSET_T=0
+  fi
+])
+
+AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+  dnl Define it also as a C macro, for the benefit of the unit tests.
+  gl_MODULE_INDICATOR_FOR_TESTS([$1])
+])
+
+AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
+[
+  GNULIB_PTHREAD_SIGMASK=0;    AC_SUBST([GNULIB_PTHREAD_SIGMASK])
+  GNULIB_SIGNAL_H_SIGPIPE=0;   AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
+  GNULIB_SIGPROCMASK=0;        AC_SUBST([GNULIB_SIGPROCMASK])
+  GNULIB_SIGACTION=0;          AC_SUBST([GNULIB_SIGACTION])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
+  HAVE_SIGSET_T=1;             AC_SUBST([HAVE_SIGSET_T])
+  HAVE_SIGINFO_T=1;            AC_SUBST([HAVE_SIGINFO_T])
+  HAVE_SIGACTION=1;            AC_SUBST([HAVE_SIGACTION])
+  HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
+                               AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
+  HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
+                               AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
+  HAVE_SIGHANDLER_T=1;         AC_SUBST([HAVE_SIGHANDLER_T])
+  REPLACE_PTHREAD_SIGMASK=0;   AC_SUBST([REPLACE_PTHREAD_SIGMASK])
+])