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3dac6181c1
Should fix fport_input_waiting when neither poll nor select nor FIONREAD are available, which is the case on MinGW. Thanks to Eli Zaretskii for the report.
95 lines
3.5 KiB
Text
95 lines
3.5 KiB
Text
# sys_select_h.m4 serial 20
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dnl Copyright (C) 2006-2013 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_HEADER_SYS_SELECT],
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[
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AC_REQUIRE([AC_C_RESTRICT])
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AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
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AC_CACHE_CHECK([whether <sys/select.h> is self-contained],
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[gl_cv_header_sys_select_h_selfcontained],
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[
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dnl Test against two bugs:
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dnl 1. On many platforms, <sys/select.h> assumes prior inclusion of
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dnl <sys/types.h>.
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dnl 2. On OSF/1 4.0, <sys/select.h> provides only a forward declaration
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dnl of 'struct timeval', and no definition of this type.
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/select.h>]],
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[[struct timeval b;]])],
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[gl_cv_header_sys_select_h_selfcontained=yes],
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[gl_cv_header_sys_select_h_selfcontained=no])
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dnl Test against another bug:
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dnl 3. On Solaris 10, <sys/select.h> provides an FD_ZERO implementation
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dnl that relies on memset(), but without including <string.h>.
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if test $gl_cv_header_sys_select_h_selfcontained = yes; then
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[#include <sys/select.h>]],
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[[int memset; int bzero;]])
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],
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[AC_LINK_IFELSE(
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[AC_LANG_PROGRAM([[#include <sys/select.h>]], [[
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#undef memset
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#define memset nonexistent_memset
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extern
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#ifdef __cplusplus
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"C"
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#endif
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void *memset (void *, int, unsigned long);
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#undef bzero
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#define bzero nonexistent_bzero
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extern
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#ifdef __cplusplus
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"C"
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#endif
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void bzero (void *, unsigned long);
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fd_set fds;
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FD_ZERO (&fds);
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]])
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],
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[],
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[gl_cv_header_sys_select_h_selfcontained=no])
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])
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fi
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])
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dnl <sys/select.h> is always overridden, because of GNULIB_POSIXCHECK.
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gl_CHECK_NEXT_HEADERS([sys/select.h])
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if test $ac_cv_header_sys_select_h = yes; then
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HAVE_SYS_SELECT_H=1
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else
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HAVE_SYS_SELECT_H=0
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fi
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AC_SUBST([HAVE_SYS_SELECT_H])
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gl_PREREQ_SYS_H_WINSOCK2
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use.
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gl_WARN_ON_USE_PREPARE([[
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/* Some systems require prerequisite headers. */
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#include <sys/types.h>
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#if !(defined __GLIBC__ && !defined __UCLIBC__) && HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <sys/select.h>
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]], [pselect select])
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])
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AC_DEFUN([gl_SYS_SELECT_MODULE_INDICATOR],
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[
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dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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])
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AC_DEFUN([gl_SYS_SELECT_H_DEFAULTS],
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[
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GNULIB_PSELECT=0; AC_SUBST([GNULIB_PSELECT])
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GNULIB_SELECT=0; AC_SUBST([GNULIB_SELECT])
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dnl Assume proper GNU behavior unless another module says otherwise.
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HAVE_PSELECT=1; AC_SUBST([HAVE_PSELECT])
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REPLACE_PSELECT=0; AC_SUBST([REPLACE_PSELECT])
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REPLACE_SELECT=0; AC_SUBST([REPLACE_SELECT])
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])
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