1 /*-
2 * Copyright (c) 2015 Craig Rodrigues
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: head/lib/libopenbsd/getdtablecount.c 290835 2015-11-14 23:07:38Z rodrigc $");
29
30 #include <sys/types.h>
31 #include <sys/sysctl.h>
32 #include <stddef.h>
33
34 int getdtablecount(void);
35
36 /*
37 * Return the count of open file descriptors for this process.
38 *
39 */
40 int
getdtablecount(void)41 getdtablecount(void)
42 {
43 int mib[4];
44 int error;
45 int nfds;
46 size_t len;
47
48 len = sizeof(nfds);
49 mib[0] = CTL_KERN;
50 mib[1] = KERN_PROC;
51 mib[2] = KERN_PROC_NFDS;
52 mib[3] = 0;
53
54 error = sysctl(mib, 4, &nfds, &len, NULL, 0);
55 if (error)
56 return (-1);
57 return (nfds);
58 }
59