| # getdtablesize.m4 serial 6 |
| dnl Copyright (C) 2008-2016 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_GETDTABLESIZE], |
| [ |
| AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) |
| AC_REQUIRE([AC_CANONICAL_HOST]) |
| AC_CHECK_FUNCS_ONCE([getdtablesize]) |
| AC_CHECK_DECLS_ONCE([getdtablesize]) |
| if test $ac_cv_func_getdtablesize = yes && |
| test $ac_cv_have_decl_getdtablesize = yes; then |
| # Cygwin 1.7.25 automatically increases the RLIMIT_NOFILE soft limit |
| # up to an unchangeable hard limit; all other platforms correctly |
| # require setrlimit before getdtablesize() can report a larger value. |
| AC_CACHE_CHECK([whether getdtablesize works], |
| [gl_cv_func_getdtablesize_works], |
| [AC_RUN_IFELSE([ |
| AC_LANG_PROGRAM([[#include <unistd.h>]], |
| [int size = getdtablesize(); |
| if (dup2 (0, getdtablesize()) != -1) |
| return 1; |
| if (size != getdtablesize()) |
| return 2; |
| ])], |
| [gl_cv_func_getdtablesize_works=yes], |
| [gl_cv_func_getdtablesize_works=no], |
| [case "$host_os" in |
| cygwin*) # on cygwin 1.5.25, getdtablesize() automatically grows |
| gl_cv_func_getdtablesize_works="guessing no" ;; |
| *) gl_cv_func_getdtablesize_works="guessing yes" ;; |
| esac]) |
| ]) |
| case "$gl_cv_func_getdtablesize_works" in |
| *yes) ;; |
| *) REPLACE_GETDTABLESIZE=1 ;; |
| esac |
| else |
| HAVE_GETDTABLESIZE=0 |
| fi |
| ]) |
| |
| # Prerequisites of lib/getdtablesize.c. |
| AC_DEFUN([gl_PREREQ_GETDTABLESIZE], [:]) |
