| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Linuxthreads - a simple clone()-based implementation of Posix */ |
| 2 | /* threads for Linux. */ |
| 3 | /* Copyright (C) 1996 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 | /* Signal handlers */ |
| 16 | |
| 17 | #include "internals.h" |
| 18 | |
| 19 | |
| 20 | /* The wrapper around user-provided signal handlers */ |
| 21 | void __pthread_sighandler(int signo, SIGCONTEXT ctx) |
| 22 | { |
| 23 | pthread_descr self; |
| 24 | char * in_sighandler; |
| 25 | self = check_thread_self(); |
| 26 | |
| 27 | /* If we're in a sigwait operation, just record the signal received |
| 28 | and return without calling the user's handler */ |
| 29 | if (THREAD_GETMEM(self, p_sigwaiting)) { |
| 30 | THREAD_SETMEM(self, p_sigwaiting, 0); |
| 31 | THREAD_SETMEM(self, p_signal, signo); |
| 32 | return; |
| 33 | } |
| 34 | /* Record that we're in a signal handler and call the user's |
| 35 | handler function */ |
| 36 | in_sighandler = THREAD_GETMEM(self, p_in_sighandler); |
| 37 | if (in_sighandler == NULL) |
| 38 | THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME); |
| 39 | CALL_SIGHANDLER(__sighandler[signo].old, signo, ctx); |
| 40 | if (in_sighandler == NULL) |
| 41 | THREAD_SETMEM(self, p_in_sighandler, NULL); |
| 42 | } |
| 43 | |
| 44 | /* The same, this time for real-time signals. */ |
| 45 | void __pthread_sighandler_rt(int signo, struct siginfo *si, |
| 46 | struct ucontext *uc) |
| 47 | { |
| 48 | pthread_descr self; |
| 49 | char * in_sighandler; |
| 50 | self = check_thread_self(); |
| 51 | |
| 52 | /* If we're in a sigwait operation, just record the signal received |
| 53 | and return without calling the user's handler */ |
| 54 | if (THREAD_GETMEM(self, p_sigwaiting)) { |
| 55 | THREAD_SETMEM(self, p_sigwaiting, 0); |
| 56 | THREAD_SETMEM(self, p_signal, signo); |
| 57 | return; |
| 58 | } |
| 59 | /* Record that we're in a signal handler and call the user's |
| 60 | handler function */ |
| 61 | in_sighandler = THREAD_GETMEM(self, p_in_sighandler); |
| 62 | if (in_sighandler == NULL) |
| 63 | THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME); |
| 64 | __sighandler[signo].rt(signo, si, uc); |
| 65 | if (in_sighandler == NULL) |
| 66 | THREAD_SETMEM(self, p_in_sighandler, NULL); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | /* A signal handler that does nothing */ |
| 71 | void __pthread_null_sighandler(int sig) { } |