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Annotation of embedaddon/libiconv/srcm4/signalblocking.m4, revision 1.1

1.1     ! misho       1: # signalblocking.m4 serial 10
        !             2: dnl Copyright (C) 2001-2002, 2006-2009 Free Software Foundation, Inc.
        !             3: dnl This file is free software; the Free Software Foundation
        !             4: dnl gives unlimited permission to copy and/or distribute it,
        !             5: dnl with or without modifications, as long as this notice is preserved.
        !             6: 
        !             7: # Determine available signal blocking primitives. Three different APIs exist:
        !             8: # 1) POSIX: sigemptyset, sigaddset, sigprocmask
        !             9: # 2) SYSV: sighold, sigrelse
        !            10: # 3) BSD: sigblock, sigsetmask
        !            11: # For simplicity, here we check only for the POSIX signal blocking.
        !            12: AC_DEFUN([gl_SIGNALBLOCKING],
        !            13: [
        !            14:   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
        !            15:   signals_not_posix=
        !            16:   AC_EGREP_HEADER([sigset_t], [signal.h], , [signals_not_posix=1])
        !            17:   if test -z "$signals_not_posix"; then
        !            18:     AC_CHECK_FUNC([sigprocmask], [gl_cv_func_sigprocmask=1])
        !            19:   fi
        !            20:   if test -z "$gl_cv_func_sigprocmask"; then
        !            21:     HAVE_POSIX_SIGNALBLOCKING=0
        !            22:     AC_LIBOBJ([sigprocmask])
        !            23:     gl_PREREQ_SIGPROCMASK
        !            24:   fi
        !            25: ])
        !            26: 
        !            27: # Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c.
        !            28: AC_DEFUN([gl_PREREQ_SIGPROCMASK],
        !            29: [
        !            30:   AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
        !            31:   AC_CHECK_TYPES([sigset_t],
        !            32:     [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
        !            33:     [#include <signal.h>
        !            34: /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */
        !            35: #include <sys/types.h>])
        !            36:   if test $gl_cv_type_sigset_t != yes; then
        !            37:     HAVE_SIGSET_T=0
        !            38:   fi
        !            39:   dnl HAVE_SIGSET_T is 1 if the system lacks the sigprocmask function but has
        !            40:   dnl the sigset_t type.
        !            41:   AC_SUBST([HAVE_SIGSET_T])
        !            42: ])