kc3-lang/gnulib/m4/sleep.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/sleep.m4

• # sleep.m4 serial 11
  dnl Copyright (C) 2007-2023 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_FUNC_SLEEP],
  [
    AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
    dnl We expect to see the declaration of sleep() in a header file.
    dnl Older versions of mingw have a sleep() function that is an alias to
    dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep():
    dnl it takes the number of milliseconds as argument and returns void.
    dnl mingw does not declare this function.
    AC_CHECK_DECLS([sleep], , , [[#include <unistd.h>]])
    AC_CHECK_FUNCS_ONCE([sleep])
    if test $ac_cv_have_decl_sleep != yes; then
      HAVE_SLEEP=0
    else
      dnl Cygwin 1.5.x has a bug where sleep can't exceed 49.7 days.
      AC_CACHE_CHECK([for working sleep], [gl_cv_func_sleep_works],
        [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  #include <errno.h>
  #include <unistd.h>
  #include <signal.h>
  static void
  handle_alarm (int sig)
  {
    if (sig != SIGALRM)
      _exit (2);
  }
  ]], [[
      /* Failure to compile this test due to missing alarm is okay,
         since all such platforms (mingw) also lack sleep.  */
      unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days.  */
      unsigned int remaining;
      signal (SIGALRM, handle_alarm);
      alarm (1);
      remaining = sleep (pentecost);
      if (remaining > pentecost)
        return 3;
      if (remaining <= pentecost - 10)
        return 4;
      return 0;
      ]])],
        [gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no],
        [case "$host_os" in
                          # Guess yes on glibc systems.
           *-gnu* | gnu*) gl_cv_func_sleep_works="guessing yes" ;;
                          # Guess yes on musl systems.
           *-musl*)       gl_cv_func_sleep_works="guessing yes" ;;
                          # Guess no on native Windows.
           mingw*)        gl_cv_func_sleep_works="guessing no" ;;
                          # If we don't know, obey --enable-cross-guesses.
           *)             gl_cv_func_sleep_works="$gl_cross_guess_normal" ;;
         esac
        ])])
      case "$gl_cv_func_sleep_works" in
        *yes) ;;
        *)
          REPLACE_SLEEP=1
          ;;
      esac
    fi
  ])
  

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