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author | Roland McGrath <roland@gnu.org> | 1995-02-18 01:27:10 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 1995-02-18 01:27:10 +0000 |
commit | 28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch) | |
tree | 15f07c4c43d635959c6afee96bde71fb1b3614ee /hurd/preempt-sig.c | |
download | glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.gz glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.tar.xz glibc-28f540f45bbacd939bfd07f213bcad2bf730b1bf.zip |
initial import
Diffstat (limited to 'hurd/preempt-sig.c')
-rw-r--r-- | hurd/preempt-sig.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/hurd/preempt-sig.c b/hurd/preempt-sig.c new file mode 100644 index 0000000000..86761967cc --- /dev/null +++ b/hurd/preempt-sig.c @@ -0,0 +1,68 @@ +/* Copyright (C) 1994 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <hurd/signal.h> + +/* Initialize PREEMPTER with the information given and stick it in the + chain of preempters for SIGNO. */ + +int +hurd_preempt_signals (struct hurd_signal_preempt *preempter, + int signo, int first_code, int last_code, + sighandler_t (*handler) (thread_t, int, long int, int)) +{ + if (signo <= 0 || signo >= NSIG) + { + errno = EINVAL; + return -1; + } + preempter->first = first_code; + preempter->last = last_code; + preempter->handler = handler; + __mutex_lock (&_hurd_signal_preempt_lock); + preempter->next = _hurd_signal_preempt[signo]; + _hurd_signal_preempt[signo] = preempter; + __mutex_unlock (&_hurd_signal_preempt_lock); + return 0; +} + +/* Remove PREEMPTER from the chain for SIGNO. */ + +int +hurd_unpreempt_signals (struct hurd_signal_preempt *preempter, int signo) +{ + struct hurd_signal_preempt *p, *lastp; + if (signo <= 0 || signo >= NSIG) + { + errno = EINVAL; + return -1; + } + __mutex_lock (&_hurd_signal_preempt_lock); + for (p = _hurd_signal_preempt[signo], lastp = NULL; + p != NULL; lastp = p, p = p->next) + if (p == preempter) + { + (lastp == NULL ? _hurd_signal_preempt[signo] : lastp->next) = p->next; + __mutex_unlock (&_hurd_signal_preempt_lock); + return 0; + } + _hurd_signal_preempt[signo] = preempter; + __mutex_unlock (&_hurd_signal_preempt_lock); + errno = ENOENT; + return -1; +} |