1 /* 2 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org> 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 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/ucontext.h> 32 #include <errno.h> 33 #include <stdlib.h> 34 35 int 36 __getcontextx_size(void) 37 { 38 39 return (sizeof(ucontext_t)); 40 } 41 42 int 43 __fillcontextx(char *ctx) 44 { 45 ucontext_t *ucp; 46 47 ucp = (ucontext_t *)ctx; 48 return (getcontext(ucp)); 49 } 50 51 __weak_reference(__getcontextx, getcontextx); 52 53 ucontext_t * 54 __getcontextx(void) 55 { 56 char *ctx; 57 int error; 58 59 ctx = malloc(__getcontextx_size()); 60 if (ctx == NULL) 61 return (NULL); 62 if (__fillcontextx(ctx) == -1) { 63 error = errno; 64 free(ctx); 65 errno = error; 66 return (NULL); 67 } 68 return ((ucontext_t *)ctx); 69 } 70