/*
 * 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 1997-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright 2026 Oxide Computer Company
 */

#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/lwp.h>
#include "libproc.h"

/*
 * exit() system call -- executed by subject process.
 */
int
pr_exit(struct ps_prochandle *Pr, int status)
{
        sysret_t rval;                  /* return value from exit() */
        argdes_t argd[1];               /* arg descriptors for exit() */
        argdes_t *adp;
        int error;

        if (Pr == NULL) {               /* no subject process */
                exit(status);
                return (0);             /* not reached */
        }

        adp = &argd[0];         /* status argument */
        adp->arg_value = status;
        adp->arg_object = NULL;
        adp->arg_type = AT_BYVAL;
        adp->arg_inout = AI_INPUT;
        adp->arg_size = 0;

        /*
         * The injected exit() call does not return. The expected result is
         * a local failure with ENOENT in errno, indicating that the process
         * has gone.
         */
        error = Psyscall(Pr, &rval, SYS_exit, 1, &argd[0]);

        if (error == 0 || (error < 0 && errno == ENOENT))
                return (0);

        /*
         * If the injected call failed in the subject process then errno is
         * set from that. Otherwise it is left as that of the operation
         * which failed locally while injecting the call.
         */
        if (error > 0)
                errno = error;
        return (-1);
}

/*
 * lwp_exit() system call -- executed by subject lwp.
 */
int
pr_lwp_exit(struct ps_prochandle *Pr)
{
        sysret_t rval;                  /* return value from lwp_exit() */
        int error;

        if (Pr == NULL) {               /* no subject process */
                (void) syscall(SYS_lwp_exit);
                return (0);             /* not reached */
        }

        /*
         * The injected _lwp_exit() call does not return, and Psyscall()
         * reports success once it has observed the lwp disappear. A local
         * failure, indicated by a negative return with ENOENT in errno, is
         * another way of finding that the lwp has gone.
         */
        error = Psyscall(Pr, &rval, SYS_lwp_exit, 0, NULL);

        if (error == 0 || (error < 0 && errno == ENOENT))
                return (0);

        /*
         * If the injected call failed in the subject process then errno is
         * set from that. Otherwise it is left as that of the operation
         * which failed locally while injecting the call.
         */
        if (error > 0)
                errno = error;
        return (-1);
}