tests/zfs-tests/cmd/mmap_exec.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 (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 https://opensource.org/licenses/CDDL-1.0.
  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 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*
  28  * Copyright (c) 2013 by Delphix. All rights reserved.
  29  */
  30
  31 #include <stdio.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34 #include <sys/types.h>
  35 #include <sys/mman.h>
  36 #include <errno.h>
  37
  38 int
  39 main(int argc, char *argv[])
  40 {
  41         int error, fd;
  42         struct stat statbuf;
  43
  44         if (argc != 2) {
  45                 (void) printf("Error: missing binary name.\n");
  46                 (void) printf("Usage:\n\t%s <binary name>\n",
  47                     argv[0]);
  48                 return (1);
  49         }
  50
  51         errno = 0;
  52
  53         if ((fd = open(argv[1], O_RDONLY)) < 0) {
  54                 error = errno;
  55                 perror("open");
  56                 return (error);
  57         }
  58         if (fstat(fd, &statbuf) < 0) {
  59                 error = errno;
  60                 perror("fstat");
  61                 return (error);
  62         }
  63
  64         if (mmap(0, statbuf.st_size,
  65             PROT_EXEC, MAP_SHARED, fd, 0) == MAP_FAILED) {
  66                 error = errno;
  67                 perror("mmap");
  68                 return (error);
  69         }
  70
  71         return (0);
  72 }