Mercurial > gnulib
view m4/select.m4 @ 17363:5a51fb7777a9
sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin
Problem reported by Marco Atzeri in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>.
* lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]:
Simply delegate to the system <sys/select.h> in this case too.
Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only
if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to
be needed on Solaris either.
* lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]:
Simply delgate to the system <sys/time.h> in this case.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Tue, 19 Mar 2013 09:08:47 -0700 |
parents | e542fd46ad6f |
children | 344018b6e5d7 |
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# select.m4 serial 7 dnl Copyright (C) 2009-2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_SELECT], [ AC_REQUIRE([gl_HEADER_SYS_SELECT]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_REQUIRE([gl_SOCKETS]) if test "$ac_cv_header_winsock2_h" = yes; then REPLACE_SELECT=1 else dnl On Interix 3.5, select(0, NULL, NULL, NULL, timeout) fails with error dnl EFAULT. AC_CHECK_HEADERS_ONCE([sys/select.h]) AC_CACHE_CHECK([whether select supports a 0 argument], [gl_cv_func_select_supports0], [ AC_RUN_IFELSE([AC_LANG_SOURCE([[ #include <sys/types.h> #include <sys/time.h> #if HAVE_SYS_SELECT_H #include <sys/select.h> #endif int main () { struct timeval timeout; timeout.tv_sec = 0; timeout.tv_usec = 5; return select (0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &timeout) < 0; }]])], [gl_cv_func_select_supports0=yes], [gl_cv_func_select_supports0=no], [ changequote(,)dnl case "$host_os" in # Guess no on Interix. interix*) gl_cv_func_select_supports0="guessing no";; # Guess yes otherwise. *) gl_cv_func_select_supports0="guessing yes";; esac changequote([,])dnl ]) ]) case "$gl_cv_func_select_supports0" in *yes) ;; *) REPLACE_SELECT=1 ;; esac dnl On FreeBSD 8.2, select() doesn't always reject bad fds. AC_CACHE_CHECK([whether select detects invalid fds], [gl_cv_func_select_detects_ebadf], [ AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <sys/types.h> #include <sys/time.h> #if HAVE_SYS_SELECT_H # include <sys/select.h> #endif #include <unistd.h> #include <errno.h> ]],[[ fd_set set; dup2(0, 16); FD_ZERO(&set); FD_SET(16, &set); close(16); struct timeval timeout; timeout.tv_sec = 0; timeout.tv_usec = 5; return select (17, &set, NULL, NULL, &timeout) != -1 || errno != EBADF; ]])], [gl_cv_func_select_detects_ebadf=yes], [gl_cv_func_select_detects_ebadf=no], [ case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_select_detects_ebadf="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_select_detects_ebadf="guessing no" ;; esac ]) ]) case $gl_cv_func_select_detects_ebadf in *yes) ;; *) REPLACE_SELECT=1 ;; esac fi dnl Determine the needed libraries. LIB_SELECT="$LIBSOCKET" if test $REPLACE_SELECT = 1; then case "$host_os" in mingw*) dnl On the MSVC platform, the function MsgWaitForMultipleObjects dnl (used in lib/select.c) requires linking with -luser32. On mingw, dnl it is implicit. AC_LINK_IFELSE( [AC_LANG_SOURCE([[ #define WIN32_LEAN_AND_MEAN #include <windows.h> int main () { MsgWaitForMultipleObjects (0, NULL, 0, 0, 0); return 0; }]])], [], [LIB_SELECT="$LIB_SELECT -luser32"]) ;; esac fi AC_SUBST([LIB_SELECT]) ])