-# sys_select_h.m4 serial 4
-dnl Copyright (C) 2006-2008 Free Software Foundation, Inc.
+# sys_select_h.m4 serial 20
+dnl Copyright (C) 2006-2014 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([gl_HEADER_SYS_SOCKET])
+ 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],
[
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/select.h>]], [[]])],
+ 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
+ #ifdef __cplusplus
+ "C"
+ #endif
+ void *memset (void *, int, unsigned long);
+ #undef bzero
+ #define bzero nonexistent_bzero
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ void bzero (void *, unsigned long);
+ fd_set fds;
+ FD_ZERO (&fds);
+ ]])
+ ],
+ [],
+ [gl_cv_header_sys_select_h_selfcontained=no])
+ ])
+ fi
])
- if test $gl_cv_header_sys_select_h_selfcontained = yes; then
- SYS_SELECT_H=''
+ 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
- SYS_SELECT_H='sys/select.h'
- gl_CHECK_NEXT_HEADERS([sys/select.h])
- if test $ac_cv_header_sys_select_h = yes; then
- HAVE_SYS_SELECT_H=1
- else
- HAVE_SYS_SELECT_H=0
- fi
- AC_SUBST([HAVE_SYS_SELECT_H])
- fi
- AC_SUBST([SYS_SELECT_H])
- if test x$ac_cv_header_winsock2_h = xyes; then
- AC_LIBOBJ(winsock-select)
+ 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>
+ ]], [pselect 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])
])
projects / gnulib.git / blobdiff