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 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