usr/src/lib/libproc/common/pr_exit.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997-2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <sys/lwp.h>
  33 #include "libproc.h"
  34
  35 /*
  36  * exit() system call -- executed by subject process.
  37  */
  38 int
  39 pr_exit(struct ps_prochandle *Pr, int status)
  40 {
  41         sysret_t rval;                  /* return value from exit() */
  42         argdes_t argd[1];               /* arg descriptors for exit() */
  43         argdes_t *adp;
  44         int error;
  45
  46         if (Pr == NULL) {               /* no subject process */
  47                 exit(status);
  48                 return (0);             /* not reached */
  49         }
  50
  51         adp = &argd[0];         /* status argument */
  52         adp->arg_value = status;
  53         adp->arg_object = NULL;
  54         adp->arg_type = AT_BYVAL;
  55         adp->arg_inout = AI_INPUT;
  56         adp->arg_size = 0;
  57
  58         error = Psyscall(Pr, &rval, SYS_exit, 1, &argd[0]);
  59         /* actually -- never returns.  Expect ENOENT */
  60
  61         if (error < 0) {
  62                 if (errno == ENOENT)    /* expected case */
  63                         error = ENOENT;
  64                 else
  65                         error = ENOSYS;
  66         }
  67
  68         if (error == 0)         /* can't happen? */
  69                 return (rval.sys_rval1);
  70
  71         if (error == ENOENT)    /* expected case */
  72                 return (0);
  73
  74         errno = error;
  75         return (-1);
  76 }
  77
  78 /*
  79  * lwp_exit() system call -- executed by subject lwp.
  80  */
  81 int
  82 pr_lwp_exit(struct ps_prochandle *Pr)
  83 {
  84         sysret_t rval;                  /* return value from lwp_exit() */
  85         int error;
  86
  87         if (Pr == NULL) {               /* no subject process */
  88                 (void) syscall(SYS_lwp_exit);
  89                 return (0);             /* not reached */
  90         }
  91
  92         error = Psyscall(Pr, &rval, SYS_lwp_exit, 0, NULL);
  93         /* actually -- never returns.  Expect ENOENT */
  94
  95         if (error < 0) {
  96                 if (errno == ENOENT)    /* expected case */
  97                         error = ENOENT;
  98                 else
  99                         error = ENOSYS;
 100         }
 101
 102         if (error == 0)         /* can't happen? */
 103                 return (rval.sys_rval1);
 104
 105         if (error == ENOENT)    /* expected case */
 106                 return (0);
 107
 108         errno = error;
 109         return (-1);
 110 }