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40 lines
1.4 KiB
40 lines
1.4 KiB
# signalblocking.m4 serial 11 |
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dnl Copyright (C) 2001-2002, 2006-2011 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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# Determine available signal blocking primitives. Three different APIs exist: |
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# 1) POSIX: sigemptyset, sigaddset, sigprocmask |
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# 2) SYSV: sighold, sigrelse |
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# 3) BSD: sigblock, sigsetmask |
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# For simplicity, here we check only for the POSIX signal blocking. |
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AC_DEFUN([gl_SIGNALBLOCKING], |
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[ |
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) |
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signals_not_posix= |
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AC_EGREP_HEADER([sigset_t], [signal.h], , [signals_not_posix=1]) |
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if test -z "$signals_not_posix"; then |
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AC_CHECK_FUNC([sigprocmask], [gl_cv_func_sigprocmask=1]) |
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fi |
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if test -z "$gl_cv_func_sigprocmask"; then |
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HAVE_POSIX_SIGNALBLOCKING=0 |
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fi |
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]) |
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# Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c. |
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AC_DEFUN([gl_PREREQ_SIGPROCMASK], |
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[ |
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) |
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AC_CHECK_TYPES([sigset_t], |
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[gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no], |
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[#include <signal.h> |
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/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */ |
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#include <sys/types.h>]) |
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if test $gl_cv_type_sigset_t != yes; then |
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HAVE_SIGSET_T=0 |
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fi |
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dnl HAVE_SIGSET_T is 1 if the system lacks the sigprocmask function but has |
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dnl the sigset_t type. |
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AC_SUBST([HAVE_SIGSET_T]) |
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])
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