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      1 # sys_wait_h.m4 serial 9
      2 dnl Copyright (C) 2008-2022 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.
      6 
      7 AC_DEFUN_ONCE([gl_SYS_WAIT_H],
      8 [
      9   AC_REQUIRE([gl_SYS_WAIT_H_DEFAULTS])
     10 
     11   dnl <sys/wait.h> is always overridden, because of GNULIB_POSIXCHECK.
     12   gl_CHECK_NEXT_HEADERS([sys/wait.h])
     13 
     14   dnl Ensure the type pid_t gets defined.
     15   AC_REQUIRE([AC_TYPE_PID_T])
     16 
     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>]],
     20     [waitpid])
     21 ])
     22 
     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],
     28 [
     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])
     34 ])
     35 
     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],
     40 [
     41   m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_WAIT_H_MODULE_INDICATOR_DEFAULTS], [
     42     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_WAITPID])
     43   ])
     44   m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_WAIT_H_MODULE_INDICATOR_DEFAULTS])
     45   AC_REQUIRE([gl_SYS_WAIT_H_DEFAULTS])
     46 ])
     47 
     48 AC_DEFUN([gl_SYS_WAIT_H_DEFAULTS],
     49 [
     50   dnl Assume proper GNU behavior unless another module says otherwise.
     51 ])
     52