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Annotation of embedaddon/libiconv/srcm4/signalblocking.m4, revision 1.1.1.1

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: ])