projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 2b778ceb | 1 | /* Copyright (C) 1992-2021 Free Software Foundation, Inc. |
| ebbad4cc | 2 | This file is part of the GNU C Library. |
| 28f540f4 | 3 | |
| ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
| 41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 28f540f4 | 8 | |
| ebbad4cc UD |
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 | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 28f540f4 | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 15 | License along with the GNU C Library; if not, see |
| 5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
| 28f540f4 | 17 | |
| 28f540f4 RM |
18 | #include <errno.h> |
| 19 | #include <hurd.h> | |
| 20 | #include <hurd/signal.h> | |
| 21 | ||
| 22 | /* Run signals handlers on the stack specified by SS (if not NULL). | |
| 23 | If OSS is not NULL, it is filled in with the old signal stack status. */ | |
| 24 | int | |
| 75531318 | 25 | __sigaltstack (const stack_t *argss, stack_t *oss) |
| 28f540f4 RM |
26 | { |
| 27 | struct hurd_sigstate *s; | |
| 75531318 | 28 | stack_t ss, old; |
| 28f540f4 RM |
29 | |
| 30 | /* Fault before taking any locks. */ | |
| 31 | if (argss != NULL) | |
| 32 | ss = *argss; | |
| 33 | if (oss != NULL) | |
| 75531318 | 34 | *(volatile stack_t *) oss = *oss; |
| 28f540f4 RM |
35 | |
| 36 | s = _hurd_self_sigstate (); | |
| 37 | __spin_lock (&s->lock); | |
| 38 | ||
| c5f65462 JM |
39 | if (argss != NULL |
| 40 | && (ss.ss_flags & SS_DISABLE) | |
| 41 | && (s->sigaltstack.ss_flags & SS_ONSTACK)) | |
| 28f540f4 RM |
42 | { |
| 43 | /* Can't disable a stack that is in use. */ | |
| 44 | __spin_unlock (&s->lock); | |
| 45 | errno = EINVAL; | |
| 46 | return -1; | |
| 47 | } | |
| 48 | ||
| 49 | old = s->sigaltstack; | |
| 50 | ||
| 51 | if (argss != NULL) | |
| 52 | s->sigaltstack = ss; | |
| 53 | ||
| 54 | __spin_unlock (&s->lock); | |
| 55 | ||
| 56 | if (oss != NULL) | |
| 57 | *oss = old; | |
| 58 | ||
| 59 | return 0; | |
| 60 | } | |
| 6a088436 | 61 | libc_hidden_def (__sigaltstack) |
| 1ab18a5b | 62 | weak_alias (__sigaltstack, sigaltstack) |