Mercurial > gnulib
view m4/sys_select_h.m4 @ 15329:e121c7cef4a9
pselect: new module
* lib/sys_select.in.h: Include <signal.h>, for 'sigset_t'.
(pselect): New decls.
* m4/sys_select_h.m4 (gl_HEADER_SYS_SELECT): Require AC_C_RESTRICT,
since the standard pselect decl uses 'restrict'.
(gl_SYS_SELECT_H_DEFAULTS): Add defaults for GNULIB_PSELECT,
HAVE_PSELECT, REPLACE_PSELECT.
* modules/sys_select (sys/select.h): Substitute GNULIB_PSELECT,
HAVE_PSELECT, REPLACE_PSELECT.
* lib/pselect.c, m4/pselect.m4, modules/pselect: New files.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Thu, 30 Jun 2011 14:57:39 -0700 |
parents | c7ae1577bd26 |
children | b3eeae7bf93e |
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# sys_select_h.m4 serial 18 dnl Copyright (C) 2006-2011 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_HEADER_SYS_SELECT], [ AC_REQUIRE([AC_C_RESTRICT]) AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS]) AC_CACHE_CHECK([whether <sys/select.h> is self-contained], [gl_cv_header_sys_select_h_selfcontained], [ dnl Test against two bugs: dnl 1. On many platforms, <sys/select.h> assumes prior inclusion of dnl <sys/types.h>. dnl 2. On OSF/1 4.0, <sys/select.h> provides only a forward declaration dnl of 'struct timeval', and no definition of this type. AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/select.h>]], [[struct timeval b;]])], [gl_cv_header_sys_select_h_selfcontained=yes], [gl_cv_header_sys_select_h_selfcontained=no]) dnl Test against another bug: dnl 3. On Solaris 10, <sys/select.h> provides an FD_ZERO implementation dnl that relies on memset(), but without including <string.h>. if test $gl_cv_header_sys_select_h_selfcontained = yes; then AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[#include <sys/select.h>]], [[int memset; int bzero;]]) ], [AC_LINK_IFELSE( [AC_LANG_PROGRAM([[#include <sys/select.h>]], [[ #undef memset #define memset nonexistent_memset extern void *memset (void *, int, unsigned long); #undef bzero #define bzero nonexistent_bzero extern void bzero (void *, unsigned long); fd_set fds; FD_ZERO (&fds); ]]) ], [], [gl_cv_header_sys_select_h_selfcontained=no]) ]) fi ]) dnl <sys/select.h> is always overridden, because of GNULIB_POSIXCHECK. gl_CHECK_NEXT_HEADERS([sys/select.h]) if test $ac_cv_header_sys_select_h = yes; then HAVE_SYS_SELECT_H=1 else HAVE_SYS_SELECT_H=0 fi AC_SUBST([HAVE_SYS_SELECT_H]) gl_PREREQ_SYS_H_WINSOCK2 dnl Check for declarations of anything we want to poison if the dnl corresponding gnulib module is not in use. gl_WARN_ON_USE_PREPARE([[ /* Some systems require prerequisite headers. */ #include <sys/types.h> #if !(defined __GLIBC__ && !defined __UCLIBC__) && HAVE_SYS_TIME_H # include <sys/time.h> #endif #include <sys/select.h> ]], [select]) ]) AC_DEFUN([gl_SYS_SELECT_MODULE_INDICATOR], [ dnl Use AC_REQUIRE here, so that the default settings are expanded once only. AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS]) gl_MODULE_INDICATOR_SET_VARIABLE([$1]) dnl Define it also as a C macro, for the benefit of the unit tests. gl_MODULE_INDICATOR_FOR_TESTS([$1]) ]) AC_DEFUN([gl_SYS_SELECT_H_DEFAULTS], [ GNULIB_PSELECT=0; AC_SUBST([GNULIB_PSELECT]) GNULIB_SELECT=0; AC_SUBST([GNULIB_SELECT]) dnl Assume proper GNU behavior unless another module says otherwise. HAVE_PSELECT=1; AC_SUBST([HAVE_PSELECT]) REPLACE_PSELECT=0; AC_SUBST([REPLACE_PSELECT]) REPLACE_SELECT=0; AC_SUBST([REPLACE_SELECT]) ])