diff options
Diffstat (limited to 'lib/libkse/thread/thr_sigaltstack.c')
-rw-r--r-- | lib/libkse/thread/thr_sigaltstack.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/lib/libkse/thread/thr_sigaltstack.c b/lib/libkse/thread/thr_sigaltstack.c new file mode 100644 index 0000000..629f5b0 --- /dev/null +++ b/lib/libkse/thread/thr_sigaltstack.c @@ -0,0 +1,111 @@ +/*- + * Copyright (c) 2003 David Xu <davidxu@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "namespace.h" +#include <errno.h> +#include <signal.h> +#include "un-namespace.h" +#include "thr_private.h" + +int _sigaltstack(stack_t *_ss, stack_t *_oss); + +__weak_reference(_sigaltstack, sigaltstack); + +int +_sigaltstack(stack_t *_ss, stack_t *_oss) +{ + struct pthread *curthread = _get_curthread(); + stack_t ss, oss; + int oonstack, errsave, ret; + kse_critical_t crit; + + if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) { + crit = _kse_critical_enter(); + ret = __sys_sigaltstack(_ss, _oss); + errsave = errno; + /* Get a copy */ + if (ret == 0 && _ss != NULL) + curthread->sigstk = *_ss; + _kse_critical_leave(crit); + errno = errsave; + return (ret); + } + + if (_ss) + ss = *_ss; + if (_oss) + oss = *_oss; + + /* Should get and set stack in atomic way */ + crit = _kse_critical_enter(); + oonstack = _thr_sigonstack(&ss); + if (_oss != NULL) { + oss = curthread->sigstk; + oss.ss_flags = (curthread->sigstk.ss_flags & SS_DISABLE) + ? SS_DISABLE : ((oonstack) ? SS_ONSTACK : 0); + } + + if (_ss != NULL) { + if (oonstack) { + _kse_critical_leave(crit); + errno = EPERM; + return (-1); + } + if ((ss.ss_flags & ~SS_DISABLE) != 0) { + _kse_critical_leave(crit); + errno = EINVAL; + return (-1); + } + if (!(ss.ss_flags & SS_DISABLE)) { + if (ss.ss_size < MINSIGSTKSZ) { + _kse_critical_leave(crit); + errno = ENOMEM; + return (-1); + } + curthread->sigstk = ss; + } else { + curthread->sigstk.ss_flags |= SS_DISABLE; + } + } + _kse_critical_leave(crit); + if (_oss != NULL) + *_oss = oss; + return (0); +} + +int +_thr_sigonstack(void *sp) +{ + struct pthread *curthread = _get_curthread(); + + return ((curthread->sigstk.ss_flags & SS_DISABLE) == 0 ? + (((size_t)sp - (size_t)curthread->sigstk.ss_sp) < curthread->sigstk.ss_size) + : 0); +} + |