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glibc  2.9
execve.c
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00001 /* Copyright (C) 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <unistd.h>
00021 
00022 #include <sysdep.h>
00023 #include <alloca.h>
00024 #include <sys/syscall.h>
00025 #include <bp-checks.h>
00026 
00027 int
00028 __execve (file, argv, envp)
00029      const char *file;
00030      char *const argv[];
00031      char *const envp[];
00032 {
00033 #if __BOUNDED_POINTERS__
00034   {
00035     char *const *v;
00036     int i;
00037     char *__unbounded *__unbounded ubp_argv;
00038     char *__unbounded *__unbounded ubp_envp;
00039     char *__unbounded *__unbounded ubp_v;
00040 
00041     for (v = argv; *v; v++)
00042       ;
00043     i = v - argv + 1;
00044     ubp_argv = (char *__unbounded *__unbounded) alloca (sizeof (*ubp_argv) * i);
00045     for (v = argv, ubp_v = ubp_argv; --i; v++, ubp_v++)
00046       *ubp_v = CHECK_STRING (*v);
00047     *ubp_v = 0;
00048 
00049     for (v = envp; *v; v++)
00050       ;
00051     i = v - envp + 1;
00052     ubp_envp = (char *__unbounded *__unbounded) alloca (sizeof (*ubp_envp) * i);
00053     for (v = envp, ubp_v = ubp_envp; --i; v++, ubp_v++)
00054       *ubp_v = CHECK_STRING (*v);
00055     *ubp_v = 0;
00056 
00057     return INLINE_SYSCALL (execve, 3, CHECK_STRING (file), ubp_argv, ubp_envp);
00058   }
00059 #else
00060   return INLINE_SYSCALL (execve, 3, file, argv, envp);
00061 #endif
00062 }
00063 weak_alias (__execve, execve)