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glibc  2.9
getdtsz.c
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00001 /* Copyright (C) 1991,92,93,94,95,97,2000 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <unistd.h>
00021 #include <hurd.h>
00022 #include <hurd/fd.h>
00023 #include <hurd/resource.h>
00024 
00025 /* Return the maximum number of file descriptors the current process
00026    could possibly have (until it raises the resource limit).  */
00027 int
00028 __getdtablesize ()
00029 {
00030   rlim_t limit;
00031 
00032   HURD_CRITICAL_BEGIN;
00033   __mutex_lock (&_hurd_rlimit_lock);
00034   limit = _hurd_rlimits[RLIMIT_NOFILE].rlim_cur;
00035   __mutex_unlock (&_hurd_rlimit_lock);
00036   HURD_CRITICAL_END;
00037 
00038   /* RLIM_INFINITY is not meaningful to our caller.  -1 is a good choice
00039      because `sysconf (_SC_OPEN_MAX)' calls us, and -1 from sysconf means
00040      "no determinable limit".  */
00041   return limit == RLIM_INFINITY ? -1 : (int) limit;
00042 }
00043 
00044 weak_alias (__getdtablesize, getdtablesize)