1 /*
2  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
3  *
4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
5  */
6 
7 #include <stdlib.h>
8 #include <unistd.h>
9 #include <sys/resource.h>
10 #include <limits.h>
11 
12 /* XXX: _BSD || _XOPEN_SOURCE >= 500 */
13 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
14 
15 
16 #define __LOCAL_OPEN_MAX	    256
17 
18 /* Return the maximum number of file descriptors
19    the current process could possibly have.  */
getdtablesize(void)20 int getdtablesize (void)
21 {
22   struct rlimit ru;
23 
24   /* This should even work if `getrlimit' is not implemented.  POSIX.1
25      does not define this function but we will generate a stub which
26      returns -1.  */
27   return getrlimit (RLIMIT_NOFILE, &ru) < 0 ? __LOCAL_OPEN_MAX : ru.rlim_cur;
28 }
29 libc_hidden_def(getdtablesize)
30 #endif
31