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Member "gnuastro-0.8/bootstrapped/m4/select.m4" (28 Dec 2018, 3475 Bytes) of package /linux/privat/gnuastro-0.8.tar.lz:


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    1 # select.m4 serial 10
    2 dnl Copyright (C) 2009-2018 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_SELECT],
    8 [
    9   AC_REQUIRE([gl_HEADER_SYS_SELECT])
   10   AC_REQUIRE([AC_C_RESTRICT])
   11   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   12   AC_REQUIRE([gl_SOCKETS])
   13   if test "$ac_cv_header_winsock2_h" = yes; then
   14     REPLACE_SELECT=1
   15   else
   16     dnl On Interix 3.5, select(0, NULL, NULL, NULL, timeout) fails with error
   17     dnl EFAULT.
   18     AC_CHECK_HEADERS_ONCE([sys/select.h])
   19     AC_CACHE_CHECK([whether select supports a 0 argument],
   20       [gl_cv_func_select_supports0],
   21       [
   22         AC_RUN_IFELSE([AC_LANG_SOURCE([[
   23 #include <sys/types.h>
   24 #include <sys/time.h>
   25 #if HAVE_SYS_SELECT_H
   26 #include <sys/select.h>
   27 #endif
   28 int main ()
   29 {
   30   struct timeval timeout;
   31   timeout.tv_sec = 0;
   32   timeout.tv_usec = 5;
   33   return select (0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &timeout) < 0;
   34 }]])], [gl_cv_func_select_supports0=yes], [gl_cv_func_select_supports0=no],
   35           [
   36 changequote(,)dnl
   37            case "$host_os" in
   38                        # Guess no on Interix.
   39              interix*) gl_cv_func_select_supports0="guessing no";;
   40                        # Guess yes otherwise.
   41              *)        gl_cv_func_select_supports0="guessing yes";;
   42            esac
   43 changequote([,])dnl
   44           ])
   45       ])
   46     case "$gl_cv_func_select_supports0" in
   47       *yes) ;;
   48       *) REPLACE_SELECT=1 ;;
   49     esac
   50 
   51     dnl On FreeBSD 8.2, select() doesn't always reject bad fds.
   52     AC_CACHE_CHECK([whether select detects invalid fds],
   53       [gl_cv_func_select_detects_ebadf],
   54       [
   55         AC_RUN_IFELSE([AC_LANG_PROGRAM([[
   56 #include <sys/types.h>
   57 #include <sys/time.h>
   58 #if HAVE_SYS_SELECT_H
   59 # include <sys/select.h>
   60 #endif
   61 #include <unistd.h>
   62 #include <errno.h>
   63 ]],[[
   64   fd_set set;
   65   dup2(0, 16);
   66   FD_ZERO(&set);
   67   FD_SET(16, &set);
   68   close(16);
   69   struct timeval timeout;
   70   timeout.tv_sec = 0;
   71   timeout.tv_usec = 5;
   72   return select (17, &set, NULL, NULL, &timeout) != -1 || errno != EBADF;
   73 ]])], [gl_cv_func_select_detects_ebadf=yes],
   74       [gl_cv_func_select_detects_ebadf=no],
   75           [
   76            case "$host_os" in
   77                              # Guess yes on Linux systems.
   78             linux-* | linux) gl_cv_func_select_detects_ebadf="guessing yes" ;;
   79                              # Guess yes on glibc systems.
   80             *-gnu* | gnu*)   gl_cv_func_select_detects_ebadf="guessing yes" ;;
   81                              # If we don't know, assume the worst.
   82             *)               gl_cv_func_select_detects_ebadf="guessing no" ;;
   83            esac
   84           ])
   85       ])
   86     case $gl_cv_func_select_detects_ebadf in
   87       *yes) ;;
   88       *) REPLACE_SELECT=1 ;;
   89     esac
   90   fi
   91 
   92   dnl Determine the needed libraries.
   93   LIB_SELECT="$LIBSOCKET"
   94   if test $REPLACE_SELECT = 1; then
   95     case "$host_os" in
   96       mingw*)
   97         dnl On the MSVC platform, the function MsgWaitForMultipleObjects
   98         dnl (used in lib/select.c) requires linking with -luser32. On mingw,
   99         dnl it is implicit.
  100         AC_LINK_IFELSE(
  101           [AC_LANG_SOURCE([[
  102 #define WIN32_LEAN_AND_MEAN
  103 #include <windows.h>
  104 int
  105 main ()
  106 {
  107   MsgWaitForMultipleObjects (0, NULL, 0, 0, 0);
  108   return 0;
  109 }]])],
  110           [],
  111           [LIB_SELECT="$LIB_SELECT -luser32"])
  112         ;;
  113     esac
  114   fi
  115   AC_SUBST([LIB_SELECT])
  116 ])