projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 1992-2014 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 PE |
15 | License along with the GNU C Library; if not, see |
| 16 | <http://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 | |
| 7ce241a0 | 25 | __sigaltstack (argss, oss) |
| ebbad4cc UD |
26 | const struct sigaltstack *argss; |
| 27 | struct sigaltstack *oss; | |
| 28f540f4 RM |
28 | { |
| 29 | struct hurd_sigstate *s; | |
| 30 | struct sigaltstack ss, old; | |
| 31 | ||
| 32 | /* Fault before taking any locks. */ | |
| 33 | if (argss != NULL) | |
| 34 | ss = *argss; | |
| 35 | if (oss != NULL) | |
| 36 | *(volatile struct sigaltstack *) oss = *oss; | |
| 37 | ||
| 38 | s = _hurd_self_sigstate (); | |
| 39 | __spin_lock (&s->lock); | |
| 40 | ||
| 41 | if (argss != NULL && | |
| 7ce241a0 | 42 | (ss.ss_flags & SS_DISABLE) && (s->sigaltstack.ss_flags & SS_ONSTACK)) |
| 28f540f4 RM |
43 | { |
| 44 | /* Can't disable a stack that is in use. */ | |
| 45 | __spin_unlock (&s->lock); | |
| 46 | errno = EINVAL; | |
| 47 | return -1; | |
| 48 | } | |
| 49 | ||
| 50 | old = s->sigaltstack; | |
| 51 | ||
| 52 | if (argss != NULL) | |
| 53 | s->sigaltstack = ss; | |
| 54 | ||
| 55 | __spin_unlock (&s->lock); | |
| 56 | ||
| 57 | if (oss != NULL) | |
| 58 | *oss = old; | |
| 59 | ||
| 60 | return 0; | |
| 61 | } | |
| 1ab18a5b | 62 | weak_alias (__sigaltstack, sigaltstack) |