projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c4029823 | 1 | /* Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc. |
| 28f540f4 RM |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Library General Public License as | |
| 6 | published by the Free Software Foundation; either version 2 of the | |
| 7 | License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Library General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Library General Public | |
| 15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
| 16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
| 17 | Cambridge, MA 02139, USA. */ | |
| 18 | ||
| 28f540f4 RM |
19 | #include <errno.h> |
| 20 | #include <signal.h> | |
| 21 | #include <stddef.h> | |
| 22 | ||
| 23 | static __sighandler_t user_handlers[NSIG]; | |
| 24 | ||
| 25 | extern int __context_syscall (int, struct sigcontext *); | |
| 26 | extern int __sigaction_syscall (int, | |
| 27 | const struct sigaction *, struct sigaction *); | |
| 28 | ||
| 29 | static void | |
| 30 | trampoline (int sig, int code, struct sigcontext *context) | |
| 31 | { | |
| 32 | (*(void (*) (int, int, struct sigcontext *)) user_handlers[sig]) | |
| 33 | (sig, code, context); | |
| 34 | __context_syscall (1, context); | |
| 35 | } | |
| 36 | ||
| 37 | /* If ACT is not NULL, change the action for SIG to *ACT. | |
| 38 | If OACT is not NULL, put the old action for SIG in *OACT. */ | |
| 39 | int | |
| c4029823 UD |
40 | __sigaction (sig, act, oact) |
| 41 | int sig; | |
| 42 | const struct sigaction *act; | |
| 43 | struct sigaction *oact; | |
| 28f540f4 RM |
44 | { |
| 45 | struct sigaction myact; | |
| 46 | __sighandler_t ohandler; | |
| 47 | ||
| 48 | if (sig <= 0 || sig >= NSIG) | |
| 49 | { | |
| c4029823 | 50 | __set_errno (EINVAL); |
| 28f540f4 RM |
51 | return -1; |
| 52 | } | |
| 53 | ||
| 54 | ohandler = user_handlers[sig]; | |
| 55 | ||
| 56 | if (act != NULL) | |
| 57 | { | |
| 58 | user_handlers[sig] = act->sa_handler; | |
| 59 | if (act->sa_handler != SIG_DFL && act->sa_handler != SIG_IGN) | |
| 60 | { | |
| 61 | myact = *act; | |
| 62 | act = &myact; | |
| 63 | act->sa_handler = (__sighandler_t) trampoline; | |
| 64 | } | |
| 65 | } | |
| 66 | ||
| 67 | if (__sigaction_syscall (sig, act, oact) < 0) | |
| 68 | { | |
| 69 | /* The syscall got an error. Restore the old handler and return -1. */ | |
| 70 | user_handlers[sig] = ohandler; | |
| 71 | return -1; | |
| 72 | } | |
| 73 | ||
| 74 | if (oact != NULL && oact->sa_handler == (__sighandler_t) trampoline) | |
| 75 | oact->sa_handler = ohandler; | |
| 76 | ||
| 77 | return 0; | |
| 78 | } | |
| 79 | ||
| 80 | weak_alias (__sigaction, sigaction) |