m4/pselect.m4

   1 # pselect.m4
   2 dnl Copyright (C) 2011-2012 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 AC_DEFUN([gl_FUNC_PSELECT],
   8 [
   9   AC_REQUIRE([gl_HEADER_SYS_SELECT])
  10   AC_REQUIRE([AC_C_RESTRICT])
  11   AC_CHECK_FUNCS_ONCE([pselect])
  12
  13   if test $ac_cv_func_pselect = yes; then
  14     AC_CACHE_CHECK([whether signature of pselect conforms to POSIX],
  15       gl_cv_sig_pselect,
  16       [AC_LINK_IFELSE(
  17          [AC_LANG_PROGRAM(
  18               [[#include <sys/select.h>
  19                 ]],
  20               [[int (*p) (int, fd_set *, fd_set *, fd_set *restrict,
  21                           struct timespec const *restrict,
  22                           sigset_t const *restrict) = pselect;
  23                 return !p;]])],
  24          [gl_cv_sig_pselect=yes],
  25          [gl_cv_sig_pselect=no])])
  26   fi
  27
  28   if test $ac_cv_func_pselect = no || test $gl_cv_sig_pselect = no; then
  29     REPLACE_PSELECT=1
  30   fi
  31 ])