| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Linuxthreads - a simple clone()-based implementation of Posix */ |
| 2 | /* threads for Linux. */ |
| 3 | /* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */ |
| 4 | /* */ |
| 5 | /* This program is free software; you can redistribute it and/or */ |
| 6 | /* modify it under the terms of the GNU Library General Public License */ |
| 7 | /* as published by the Free Software Foundation; either version 2 */ |
| 8 | /* of the License, or (at your option) any later version. */ |
| 9 | /* */ |
| 10 | /* This program is distributed in the hope that it will be useful, */ |
| 11 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ |
| 12 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ |
| 13 | /* GNU Library General Public License for more details. */ |
| 14 | |
| 15 | /* Redefine siglongjmp and longjmp so that they interact correctly |
| 16 | with cleanup handlers */ |
| 17 | |
| 18 | #include <setjmp.h> |
| 19 | #include "pthread.h" |
| 20 | #include "internals.h" |
| 21 | #include <bits/stackinfo.h> |
| 22 | |
| 23 | /* These functions are not declared anywhere since they shouldn't be |
| 24 | used at another place but here. */ |
| 25 | extern __typeof(siglongjmp) __libc_siglongjmp attribute_noreturn; |
| 26 | extern __typeof(longjmp) __libc_longjmp attribute_noreturn; |
| 27 | |
| 28 | static void pthread_cleanup_upto(__jmp_buf target) |
| 29 | { |
| 30 | pthread_descr self = thread_self(); |
| 31 | struct _pthread_cleanup_buffer * c; |
| 32 | char *currentframe = CURRENT_STACK_FRAME; |
| 33 | |
| 34 | for (c = THREAD_GETMEM(self, p_cleanup); |
| 35 | c != NULL && _JMPBUF_UNWINDS(target, c); |
| 36 | c = c->__prev) |
| 37 | { |
| 38 | #ifdef _STACK_GROWS_DOWN |
| 39 | if ((char *) c <= currentframe) |
| 40 | { |
| 41 | c = NULL; |
| 42 | break; |
| 43 | } |
| 44 | #elif defined _STACK_GROWS_UP |
| 45 | if ((char *) c >= currentframe) |
| 46 | { |
| 47 | c = NULL; |
| 48 | break; |
| 49 | } |
| 50 | #else |
| 51 | # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP" |
| 52 | #endif |
| 53 | c->__routine(c->__arg); |
| 54 | } |
| 55 | THREAD_SETMEM(self, p_cleanup, c); |
| 56 | if (THREAD_GETMEM(self, p_in_sighandler) |
| 57 | && _JMPBUF_UNWINDS(target, THREAD_GETMEM(self, p_in_sighandler))) |
| 58 | THREAD_SETMEM(self, p_in_sighandler, NULL); |
| 59 | } |
| 60 | |
| 61 | void attribute_noreturn siglongjmp(sigjmp_buf env, int val) |
| 62 | { |
| 63 | pthread_cleanup_upto(env->__jmpbuf); |
| 64 | __libc_siglongjmp(env, val); |
| 65 | } |
| 66 | |
| 67 | void attribute_noreturn longjmp(jmp_buf env, int val) |
| 68 | { |
| 69 | pthread_cleanup_upto(env->__jmpbuf); |
| 70 | __libc_longjmp(env, val); |
| 71 | } |