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glibc  2.9
getdtsz.c
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00001 /* Copyright (C) 1991, 1993, 1995, 1996, 1997 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 <limits.h>
00020 #include <unistd.h>
00021 #include <sys/resource.h>
00022 
00023 /* Return the maximum number of file descriptors
00024    the current process could possibly have.  */
00025 int
00026 __getdtablesize (void)
00027 {
00028   struct rlimit ru;
00029 
00030   /* This should even work if `getrlimit' is not implemented.  POSIX.1
00031      does not define this function but we will generate a stub which
00032      returns -1.  */
00033   return __getrlimit (RLIMIT_NOFILE, &ru) < 0 ? OPEN_MAX : ru.rlim_cur;
00034 }
00035 
00036 weak_alias (__getdtablesize, getdtablesize)