usr/src/lib/libbc/libc/sys/sys5/execve.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 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 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <string.h>
  28 #include <sys/file.h>
  29 #include <sys/syscall.h>
  30
  31 int
  32 execve(char *file, char **argv, char **arge)
  33 {
  34         char *c;
  35         char path[256];
  36
  37         if (strncmp(file, "/usr/bin", strlen("/usr/bin")) == 0 ||
  38                 strncmp(file, "/bin", strlen("/bin")) == 0) {
  39                 if (_syscall(SYS_faccessat, AT_FDCWD, file, F_OK, 0) == -1) {
  40                         strcpy(path, "/usr/ucb");
  41                         strcat(path, strrchr(file, '/'));
  42                         file = path;
  43                 }
  44         }
  45         else if (strncmp(file, "/usr/ucb", strlen("/usr/ucb")) == 0) {
  46                 strcpy(path, "/usr/bin");
  47                 strcat(path, strrchr(file, '/'));
  48                 if (_syscall(SYS_faccessat, AT_FDCWD, path, F_OK, 0) == 0)
  49                         file = path;
  50         }
  51         else if (strncmp(file, "/usr/5bin", strlen("/usr/5bin")) == 0) {
  52                 strcpy(path, "/usr/bin");
  53                 strcat(path, strrchr(file, '/'));
  54                 if (_syscall(SYS_faccessat, AT_FDCWD, path, F_OK, 0) == 0)
  55                         file = path;
  56                 else {
  57                         strcpy(path, "/usr/ucb");
  58                         strcat(path, strrchr(file, '/'));
  59                         if (_syscall(SYS_faccessat, AT_FDCWD, path, F_OK, 0)
  60                             == 0)
  61                                 file = path;
  62                 }
  63         }
  64
  65         return (_syscall(SYS_execve, file, argv, arge));
  66 }