-# fcntl.m4 serial 5
-dnl Copyright (C) 2009-2014 Free Software Foundation, Inc.
+# fcntl.m4 serial 8
+dnl Copyright (C) 2009-2015 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.
dnl haiku alpha 2 F_DUPFD has wrong errno
AC_CACHE_CHECK([whether fcntl handles F_DUPFD correctly],
[gl_cv_func_fcntl_f_dupfd_works],
- [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
-#include <fcntl.h>
-#include <errno.h>
-]], [[int result = 0;
- if (fcntl (0, F_DUPFD, -1) != -1) result |= 1;
- if (errno != EINVAL) result |= 2;
- return result;
- ]])],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <errno.h>
+ #include <fcntl.h>
+ #include <limits.h>
+ #include <sys/resource.h>
+ #include <unistd.h>
+ #ifndef RLIM_SAVED_CUR
+ # define RLIM_SAVED_CUR RLIM_INFINITY
+ #endif
+ #ifndef RLIM_SAVED_MAX
+ # define RLIM_SAVED_MAX RLIM_INFINITY
+ #endif
+ ]],
+ [[int result = 0;
+ int bad_fd = INT_MAX;
+ struct rlimit rlim;
+ if (getrlimit (RLIMIT_NOFILE, &rlim) == 0
+ && 0 <= rlim.rlim_cur && rlim.rlim_cur <= INT_MAX
+ && rlim.rlim_cur != RLIM_INFINITY
+ && rlim.rlim_cur != RLIM_SAVED_MAX
+ && rlim.rlim_cur != RLIM_SAVED_CUR)
+ bad_fd = rlim.rlim_cur;
+ if (fcntl (0, F_DUPFD, -1) != -1) result |= 1;
+ if (errno != EINVAL) result |= 2;
+ if (fcntl (0, F_DUPFD, bad_fd) != -1) result |= 4;
+ if (errno != EINVAL) result |= 8;
+ return result;]])],
[gl_cv_func_fcntl_f_dupfd_works=yes],
[gl_cv_func_fcntl_f_dupfd_works=no],
- [# Guess that it works on glibc systems
- case $host_os in #((
- *-gnu*) gl_cv_func_fcntl_f_dupfd_works="guessing yes";;
- *) gl_cv_func_fcntl_f_dupfd_works="guessing no";;
+ [case $host_os in
+ aix* | cygwin* | haiku*)
+ gl_cv_func_fcntl_f_dupfd_works="guessing no" ;;
+ *) gl_cv_func_fcntl_f_dupfd_works="guessing yes" ;;
esac])])
case $gl_cv_func_fcntl_f_dupfd_works in
*yes) ;;