sigaction.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/fault.h>
#include <sys/signal.h>
#include <sys/siginfo.h>
#include <sys/debug.h>
int
sigaction(int sig, struct sigaction *actp, struct sigaction *oactp)
{
struct sigaction act;
struct sigaction oact;
k_sigset_t set;
proc_t *p;
int sigcld_look = 0;
if (sig <= 0 || sig >= NSIG ||
(actp != NULL && sigismember(&cantmask, sig)))
return (set_errno(EINVAL));
/*
* act and oact might be the same address, so copyin act first.
*/
if (actp) {
#if defined(__sparc)
void (*handler)();
#endif
if (copyin(actp, &act, sizeof (act)))
return (set_errno(EFAULT));
#if defined(__sparc)
/*
* Check alignment of handler
*/
handler = act.sa_handler;
if (handler != SIG_IGN && handler != SIG_DFL &&
((uintptr_t)handler & 0x3) != 0)
return (set_errno(EINVAL));
#endif
}
p = curproc;
mutex_enter(&p->p_lock);
if (oactp) {
int flags;
void (*disp)();
disp = u.u_signal[sig - 1];
flags = 0;
if (disp != SIG_DFL && disp != SIG_IGN) {
set = u.u_sigmask[sig-1];
if (sigismember(&p->p_siginfo, sig))
flags |= SA_SIGINFO;
if (sigismember(&u.u_sigrestart, sig))
flags |= SA_RESTART;
if (sigismember(&u.u_sigonstack, sig))
flags |= SA_ONSTACK;
if (sigismember(&u.u_sigresethand, sig))
flags |= SA_RESETHAND;
if (sigismember(&u.u_signodefer, sig))
flags |= SA_NODEFER;
} else
sigemptyset(&set);
if (sig == SIGCLD) {
if (p->p_flag & SNOWAIT)
flags |= SA_NOCLDWAIT;
if (!(p->p_flag & SJCTL))
flags |= SA_NOCLDSTOP;
}
oact.sa_handler = disp;
oact.sa_flags = flags;
sigktou(&set, &oact.sa_mask);
}
if (actp) {
if (sig == SIGCLD &&
act.sa_handler != SIG_IGN &&
act.sa_handler != SIG_DFL)
sigcld_look = 1;
sigutok(&act.sa_mask, &set);
setsigact(sig, act.sa_handler, set, act.sa_flags);
}
mutex_exit(&p->p_lock);
if (sigcld_look)
sigcld_repost();
if (oactp &&
copyout(&oact, oactp, sizeof (oact)))
return (set_errno(EFAULT));
return (0);
}
#ifdef _SYSCALL32_IMPL
int
sigaction32(int sig, struct sigaction32 *actp, struct sigaction32 *oactp)
{
struct sigaction32 act32;
struct sigaction32 oact32;
k_sigset_t set;
proc_t *p;
int sigcld_look = 0;
if (sig <= 0 || sig >= NSIG ||
(actp != NULL && sigismember(&cantmask, sig)))
return (set_errno(EINVAL));
/*
* act and oact might be the same address, so copyin act first.
*/
if (actp) {
#if defined(__sparc)
void (*handler)();
#endif
if (copyin(actp, &act32, sizeof (act32)))
return (set_errno(EFAULT));
#if defined(__sparc)
/*
* Check alignment of handler
*/
handler = (void (*)())act32.sa_handler;
if (handler != SIG_IGN && handler != SIG_DFL &&
((uintptr_t)handler & 0x3) != 0)
return (set_errno(EINVAL));
#endif
}
p = curproc;
mutex_enter(&p->p_lock);
if (oactp) {
int flags;
void (*disp)();
disp = u.u_signal[sig - 1];
flags = 0;
if (disp != SIG_DFL && disp != SIG_IGN) {
set = u.u_sigmask[sig-1];
if (sigismember(&p->p_siginfo, sig))
flags |= SA_SIGINFO;
if (sigismember(&u.u_sigrestart, sig))
flags |= SA_RESTART;
if (sigismember(&u.u_sigonstack, sig))
flags |= SA_ONSTACK;
if (sigismember(&u.u_sigresethand, sig))
flags |= SA_RESETHAND;
if (sigismember(&u.u_signodefer, sig))
flags |= SA_NODEFER;
} else
sigemptyset(&set);
if (sig == SIGCLD) {
if (p->p_flag & SNOWAIT)
flags |= SA_NOCLDWAIT;
if (!(p->p_flag & SJCTL))
flags |= SA_NOCLDSTOP;
}
oact32.sa_handler = (caddr32_t)(uintptr_t)disp;
oact32.sa_flags = flags;
sigktou(&set, &oact32.sa_mask);
}
if (actp) {
if (sig == SIGCLD &&
act32.sa_handler != (caddr32_t)SIG_IGN &&
act32.sa_handler != (caddr32_t)SIG_DFL)
sigcld_look = 1;
sigutok(&act32.sa_mask, &set);
setsigact(sig, (void (*)())(uintptr_t)act32.sa_handler, set,
act32.sa_flags);
}
mutex_exit(&p->p_lock);
if (sigcld_look)
sigcld_repost();
if (oactp &&
copyout(&oact32, oactp, sizeof (oact32)))
return (set_errno(EFAULT));
return (0);
}
#endif /* _SYSCALL32_IMPL */