| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 1992-2016 Free Software Foundation, Inc. |
| 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 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. |
| 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 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 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 |
| 25 | __sigaltstack (const struct sigaltstack *argss, struct sigaltstack *oss) |
| 26 | { |
| 27 | struct hurd_sigstate *s; |
| 28 | struct sigaltstack ss, old; |
| 29 | |
| 30 | /* Fault before taking any locks. */ |
| 31 | if (argss != NULL) |
| 32 | ss = *argss; |
| 33 | if (oss != NULL) |
| 34 | *(volatile struct sigaltstack *) oss = *oss; |
| 35 | |
| 36 | s = _hurd_self_sigstate (); |
| 37 | __spin_lock (&s->lock); |
| 38 | |
| 39 | if (argss != NULL && |
| 40 | (ss.ss_flags & SS_DISABLE) && (s->sigaltstack.ss_flags & SS_ONSTACK)) |
| 41 | { |
| 42 | /* Can't disable a stack that is in use. */ |
| 43 | __spin_unlock (&s->lock); |
| 44 | errno = EINVAL; |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | old = s->sigaltstack; |
| 49 | |
| 50 | if (argss != NULL) |
| 51 | s->sigaltstack = ss; |
| 52 | |
| 53 | __spin_unlock (&s->lock); |
| 54 | |
| 55 | if (oss != NULL) |
| 56 | *oss = old; |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | weak_alias (__sigaltstack, sigaltstack) |