1 # sys_wait_h.m4 serial 9
2 dnl Copyright (C) 2008-2021 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.
7 AC_DEFUN_ONCE([gl_SYS_WAIT_H],
9 AC_REQUIRE([gl_SYS_WAIT_H_DEFAULTS])
11 dnl <sys/wait.h> is always overridden, because of GNULIB_POSIXCHECK.
12 gl_CHECK_NEXT_HEADERS([sys/wait.h])
14 dnl Ensure the type pid_t gets defined.
15 AC_REQUIRE([AC_TYPE_PID_T])
17 dnl Check for declarations of anything we want to poison if the
18 dnl corresponding gnulib module is not in use.
19 gl_WARN_ON_USE_PREPARE([[#include <sys/wait.h>]],
23 # gl_SYS_WAIT_MODULE_INDICATOR([modulename])
24 # sets the shell variable that indicates the presence of the given module
25 # to a C preprocessor expression that will evaluate to 1.
26 # This macro invocation must not occur in macros that are AC_REQUIREd.
27 AC_DEFUN([gl_SYS_WAIT_MODULE_INDICATOR],
29 dnl Ensure to expand the default settings once only.
30 gl_SYS_WAIT_H_REQUIRE_DEFAULTS
31 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
32 dnl Define it also as a C macro, for the benefit of the unit tests.
33 gl_MODULE_INDICATOR_FOR_TESTS([$1])
36 # Initializes the default values for AC_SUBSTed shell variables.
37 # This macro must not be AC_REQUIREd. It must only be invoked, and only
38 # outside of macros or in macros that are not AC_REQUIREd.
39 AC_DEFUN([gl_SYS_WAIT_H_REQUIRE_DEFAULTS],
41 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_WAIT_H_MODULE_INDICATOR_DEFAULTS], [
42 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WAITPID])
44 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_WAIT_H_MODULE_INDICATOR_DEFAULTS])
45 AC_REQUIRE([gl_SYS_WAIT_H_DEFAULTS])
48 AC_DEFUN([gl_SYS_WAIT_H_DEFAULTS],
50 dnl Assume proper GNU behavior unless another module says otherwise.