1 /* $NetBSD: signalnext.c,v 1.1 2017/05/09 11:14:16 kre Exp $ */
2
3 /*
4 * Software available to all and sundry without limitations
5 * but without warranty of fitness for any purpose whatever.
6 *
7 * Licensed for any use, including redistribution in source
8 * and binary forms, with or without modifications, subject
9 * the following agreement:
10 *
11 * Licensee agrees to indemnify licensor, and distributor, for
12 * the full amount of any any claim made by the licensee against
13 * the licensor or distributor, for any action that results from
14 * any use or redistribution of this software, plus any costs
15 * incurred by licensor or distributor resulting from that claim.
16 *
17 * This licence must be retained with the software.
18 */
19
20 #include <sys/types.h>
21
22 #include <signal.h>
23 #include <string.h>
24
25 /*
26 * signalnext()
27 *
28 * Returns the next signal number after the one given.
29 * Giving 0 as 'sig' requests the lowest available signal number.
30 *
31 * Returns:
32 * -1 on error (invalid 'sig' arg)
33 * 0 when there is no next.
34 * otherwise the next greater implemented signal number after 'sig'
35 */
36
37 int
signalnext(int sig)38 signalnext(int sig)
39 {
40
41 if (sig < 0 || sig >= NSIG || (sig > 0 && sys_signame[sig] == NULL))
42 return -1;
43
44 while (++sig < NSIG)
45 if (sys_signame[sig] != NULL)
46 return sig;
47
48 return 0;
49 }
50