118 lines
2.6 KiB
C
Executable File
118 lines
2.6 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* Copyright (c) 1994 Sun Microsystems, Inc. */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)sigqueue.c 1.4 94/12/06 SMI" /* from SVr4.0 1.78 */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/proc.h>
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#include <sys/procset.h>
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#include <sys/fault.h>
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#include <sys/signal.h>
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#include <sys/siginfo.h>
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#include <sys/debug.h>
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static int
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sigqkill(pid_t pid, int signo, sigsend_t *sigsend)
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{
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register proc_t *p;
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int error;
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if (signo < 0 || signo >= NSIG)
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return (set_errno(EINVAL));
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if (pid == -1) {
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procset_t set;
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setprocset(&set, POP_AND, P_ALL, P_MYID, P_ALL, P_MYID);
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error = sigsendset(&set, sigsend);
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} else if (pid > 0) {
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mutex_enter(&pidlock);
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if ((p = prfind(pid)) == NULL || p->p_stat == SIDL)
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error = ESRCH;
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else {
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error = sigsendproc(p, sigsend);
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if (error == 0 && sigsend->perm == 0)
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error = EPERM;
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}
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mutex_exit(&pidlock);
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} else {
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int nfound = 0;
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pid_t pgid;
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if (pid == 0)
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pgid = ttoproc(curthread)->p_pgrp;
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else
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pgid = -pid;
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error = 0;
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mutex_enter(&pidlock);
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for (p = pgfind(pgid); p && !error; p = p->p_pglink) {
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if (p->p_stat != SIDL) {
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nfound++;
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error = sigsendproc(p, sigsend);
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}
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}
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mutex_exit(&pidlock);
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if (nfound == 0)
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error = ESRCH;
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else if (error == 0 && sigsend->perm == 0)
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error = EPERM;
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}
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if (error)
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return (set_errno(error));
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return (0);
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}
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/*
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* for implementations that don't require binary compatibility,
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* the kill system call may be made into a library call to the
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* sigsend system call
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*/
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int
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kill(pid_t pid, int sig)
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{
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sigsend_t v;
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struct_zero((caddr_t)&v, sizeof (v));
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v.sig = sig;
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v.checkperm = 1;
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v.sicode = SI_USER;
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return (sigqkill(pid, sig, &v));
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}
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/*
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* The handling of small unions, like the sigval argument to sigqueue,
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* is architecture dependent. We have adapted the convention that the
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* value itself is passed in the storage which crosses the kernel
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* protection boundary. This procedure will accept a scalar argument,
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* and store it in the appropriate value member of the sigsend_t structure.
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*/
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int
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sigqueue(pid_t pid, int signo, /* union sigval */ void *value)
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{
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sigsend_t v;
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if (pid < 0)
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return (set_errno(EINVAL));
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struct_zero((caddr_t)&v, sizeof (v));
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v.sig = signo;
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v.checkperm = 1;
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v.sicode = SI_QUEUE;
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v.value.sival_ptr = value;
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return (sigqkill(pid, signo, &v));
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}
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