diff options
Diffstat (limited to 'm4/signalblocking.m4')
| -rw-r--r-- | m4/signalblocking.m4 | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/m4/signalblocking.m4 b/m4/signalblocking.m4 new file mode 100644 index 0000000..5ad8dbf --- /dev/null +++ b/m4/signalblocking.m4 @@ -0,0 +1,42 @@ +# signalblocking.m4 serial 10 +dnl Copyright (C) 2001-2002, 2006-2011 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. + +# Determine available signal blocking primitives. Three different APIs exist: +# 1) POSIX: sigemptyset, sigaddset, sigprocmask +# 2) SYSV: sighold, sigrelse +# 3) BSD: sigblock, sigsetmask +# For simplicity, here we check only for the POSIX signal blocking. +AC_DEFUN([gl_SIGNALBLOCKING], +[ + AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) + signals_not_posix= + AC_EGREP_HEADER([sigset_t], [signal.h], , [signals_not_posix=1]) + if test -z "$signals_not_posix"; then + AC_CHECK_FUNC([sigprocmask], [gl_cv_func_sigprocmask=1]) + fi + if test -z "$gl_cv_func_sigprocmask"; then + HAVE_POSIX_SIGNALBLOCKING=0 + AC_LIBOBJ([sigprocmask]) + gl_PREREQ_SIGPROCMASK + fi +]) + +# Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c. +AC_DEFUN([gl_PREREQ_SIGPROCMASK], +[ + AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) + 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 + dnl HAVE_SIGSET_T is 1 if the system lacks the sigprocmask function but has + dnl the sigset_t type. + AC_SUBST([HAVE_SIGSET_T]) +]) |