1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <unistd.h> 20 #include <hurd.h> 21 #include <hurd/fd.h> 22 #include <hurd/resource.h> 23 24 /* Return the maximum number of file descriptors the current process 25 could possibly have (until it raises the resource limit). */ 26 int __getdtablesize(void)27__getdtablesize (void) 28 { 29 rlim_t limit; 30 31 HURD_CRITICAL_BEGIN; 32 __mutex_lock (&_hurd_rlimit_lock); 33 limit = _hurd_rlimits[RLIMIT_NOFILE].rlim_cur; 34 __mutex_unlock (&_hurd_rlimit_lock); 35 HURD_CRITICAL_END; 36 37 /* RLIM_INFINITY is not meaningful to our caller. -1 is a good choice 38 because `sysconf (_SC_OPEN_MAX)' calls us, and -1 from sysconf means 39 "no determinable limit". */ 40 return limit == RLIM_INFINITY ? -1 : (int) limit; 41 } 42 43 weak_alias (__getdtablesize, getdtablesize) 44