linuxthreads/sysdeps/unix/sysv/linux/execve.c

   1 /* Copyright (C) 1999, 2000, 2002 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 extern int __syscall_execve (const char *__unbounded file,
  28                              char *__unbounded const *__unbounded argv,
  29                              char *__unbounded const *__unbounded envp);
  30 extern void __pthread_kill_other_threads_np (void);
  31 weak_extern (__pthread_kill_other_threads_np)
  32
  33
  34 int
  35 __execve (file, argv, envp)
  36      const char *file;
  37      char *const argv[];
  38      char *const envp[];
  39 {
  40   /* If this is a threaded application kill all other threads.  */
  41   if (__pthread_kill_other_threads_np)
  42     __pthread_kill_other_threads_np ();
  43 #if __BOUNDED_POINTERS__
  44   {
  45     char *const *v;
  46     int i;
  47     char *__unbounded *__unbounded ubp_argv;
  48     char *__unbounded *__unbounded ubp_envp;
  49     char *__unbounded *__unbounded ubp_v;
  50
  51     for (v = argv; *v; v++)
  52       ;
  53     i = v - argv + 1;
  54     ubp_argv = (char *__unbounded *__unbounded) alloca (sizeof (*ubp_argv) * i);
  55     for (v = argv, ubp_v = ubp_argv; --i; v++, ubp_v++)
  56       *ubp_v = CHECK_STRING (*v);
  57     *ubp_v = 0;
  58
  59     for (v = envp; *v; v++)
  60       ;
  61     i = v - envp + 1;
  62     ubp_envp = (char *__unbounded *__unbounded) alloca (sizeof (*ubp_envp) * i);
  63     for (v = envp, ubp_v = ubp_envp; --i; v++, ubp_v++)
  64       *ubp_v = CHECK_STRING (*v);
  65     *ubp_v = 0;
  66
  67     return INLINE_SYSCALL (execve, 3, CHECK_STRING (file), ubp_argv, ubp_envp);
  68   }
  69 #else
  70   return INLINE_SYSCALL (execve, 3, file, argv, envp);
  71 #endif
  72 }
  73 weak_alias (__execve, execve)