1 /* $OpenBSD: ab.c,v 1.1 2014/11/23 08:46:49 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 2014 Philip Guenther <guenther@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <stdlib.h> 20 #include <stdio.h> 21 #include <pthread.h> 22 23 #define CALLBACK(file, name) \ 24 static void name(void) \ 25 { \ 26 fprintf(file, "libab "#name"\n"); \ 27 fflush(file); \ 28 } 29 30 CALLBACK(stdout, cleanup) 31 32 void 33 ab(void) 34 { 35 atexit(cleanup); 36 } 37 38 static FILE *otherf; 39 40 CALLBACK(stdout, atfork_prepare) 41 CALLBACK(stdout, atfork_parent) 42 CALLBACK(otherf, atfork_child) 43 44 void 45 ab_atfork(FILE *f) 46 { 47 otherf = f; 48 pthread_atfork(atfork_prepare, atfork_parent, atfork_child); 49 } 50