sysdeps/unix/sysv/linux/execve.c

   1 /* Copyright (C) 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21
  22 #include <sysdep.h>
  23 #include <alloca.h>
  24 #include <sys/syscall.h>
  25 #include <bp-checks.h>
  26
  27 int
  28 __execve (file, argv, envp)
  29      const char *file;
  30      char *const argv[];
  31      char *const envp[];
  32 {
  33 #if __BOUNDED_POINTERS__
  34   {
  35     char *const *v;
  36     int i;
  37     char *__unbounded *__unbounded ubp_argv;
  38     char *__unbounded *__unbounded ubp_envp;
  39     char *__unbounded *__unbounded ubp_v;
  40
  41     for (v = argv; *v; v++)
  42       ;
  43     i = v - argv + 1;
  44     ubp_argv = (char *__unbounded *__unbounded) alloca (sizeof (*ubp_argv) * i);
  45     for (v = argv, ubp_v = ubp_argv; --i; v++, ubp_v++)
  46       *ubp_v = CHECK_STRING (*v);
  47     *ubp_v = 0;
  48
  49     for (v = envp; *v; v++)
  50       ;
  51     i = v - envp + 1;
  52     ubp_envp = (char *__unbounded *__unbounded) alloca (sizeof (*ubp_envp) * i);
  53     for (v = envp, ubp_v = ubp_envp; --i; v++, ubp_v++)
  54       *ubp_v = CHECK_STRING (*v);
  55     *ubp_v = 0;
  56
  57     return INLINE_SYSCALL (execve, 3, CHECK_STRING (file), ubp_argv, ubp_envp);
  58   }
  59 #else
  60   return INLINE_SYSCALL (execve, 3, file, argv, envp);
  61 #endif
  62 }
  63 weak_alias (__execve, execve)