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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2006 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 <errno.h>
  30 #include <unistd.h>
  31 #include <sys/lx_misc.h>
  32 
  33 /*
  34  * fork() and vfork()
  35  *
  36  * These cannot be pass thru system calls because we need libc to do its own
  37  * initialization or else bad things will happen (i.e. ending up with a bad
  38  * schedctl page).  On Linux, there is no such thing as forkall(), so we use
  39  * fork1() here.
  40  */
  41 int
  42 lx_fork(void)
  43 {
  44         int ret = fork1();
  45 
  46         if (ret == 0 && lx_is_rpm)
  47                 (void) sleep(lx_rpm_delay);
  48 
  49         return (ret == -1 ? -errno : ret);
  50 }
  51 
  52 /*
  53  * For vfork(), we have a serious problem because the child is not allowed to
  54  * return from the current frame because it will corrupt the parent's stack.
  55  * Since the semantics of vfork() are rather ill-defined (other than "it's
  56  * faster than fork"), we should theoretically be safe by falling back to
  57  * fork1().
  58  */
  59 int
  60 lx_vfork(void)
  61 {
  62         int ret = fork1();
  63 
  64         return (ret == -1 ? -errno : ret);
  65 }