| /* Copyright (C) 1992, 93, 94, 95, 97, 98 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <hurd.h> |
| #include <hurd/signal.h> |
| |
| /* Run signals handlers on the stack specified by SS (if not NULL). |
| If OSS is not NULL, it is filled in with the old signal stack status. */ |
| int |
| __sigaltstack (argss, oss) |
| const struct sigaltstack *argss; |
| struct sigaltstack *oss; |
| { |
| struct hurd_sigstate *s; |
| struct sigaltstack ss, old; |
| |
| /* Fault before taking any locks. */ |
| if (argss != NULL) |
| ss = *argss; |
| if (oss != NULL) |
| *(volatile struct sigaltstack *) oss = *oss; |
| |
| s = _hurd_self_sigstate (); |
| __spin_lock (&s->lock); |
| |
| if (argss != NULL && |
| (ss.ss_flags & SS_DISABLE) && (s->sigaltstack.ss_flags & SS_ONSTACK)) |
| { |
| /* Can't disable a stack that is in use. */ |
| __spin_unlock (&s->lock); |
| errno = EINVAL; |
| return -1; |
| } |
| |
| old = s->sigaltstack; |
| |
| if (argss != NULL) |
| s->sigaltstack = ss; |
| |
| __spin_unlock (&s->lock); |
| |
| if (oss != NULL) |
| *oss = old; |
| |
| return 0; |
| } |
| weak_alias (__sigaltstack, sigaltstack) |