1 /* 2 * Copyright (c) 2014 Philip Guenther <guenther@openbsd.org> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include <stdio.h> 18 #include <signal.h> 19 #include <string.h> 20 #include <unistd.h> 21 #include "thread_private.h" 22 23 void 24 _thread_set_callbacks(const struct thread_callbacks *cb, size_t len) 25 { 26 sigset_t allmask, omask; 27 28 if (sizeof(*cb) != len) { 29 fprintf(stderr, "library mismatch: libc expected %z but" 30 " libpthread gave %z\n", sizeof(*cb), len); 31 fflush(stderr); 32 _exit(44); 33 } 34 35 sigfillset(&allmask); 36 if (sigprocmask(SIG_BLOCK, &allmask, &omask) == 0) { 37 /* mprotect RW */ 38 memcpy(&_thread_cb, cb, sizeof(_thread_cb)); 39 /* mprotect RO | LOCKPERM | NOUNMAP */ 40 sigprocmask(SIG_SETMASK, &omask, NULL); 41 } 42 } 43