/* Copyright (C) 1991, 1997, 1998, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <alloca.h> #include <unistd.h> #include <stdarg.h> #include <stddef.h> #include <string.h> #include <stackinfo.h> /* Execute PATH with all arguments after PATH until a NULL pointer, and the argument after that for environment. */ int execle (const char *path, const char *arg, ...) { size_t argv_max = 1024; const char **argv = alloca (argv_max * sizeof (const char *)); const char *const *envp; unsigned int i; va_list args; argv[0] = arg; va_start (args, arg); i = 0; while (argv[i++] != NULL) { if (i == argv_max) { const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *)); #ifndef _STACK_GROWS_UP if ((char *) nptr + argv_max == (char *) argv) { /* Stack grows down. */ argv = (const char **) memcpy (nptr, argv, i * sizeof (const char *)); argv_max += i; } else #endif #ifndef _STACK_GROWS_DOWN if ((char *) argv + i == (char *) nptr) /* Stack grows up. */ argv_max += i; else #endif /* We have a hole in the stack. */ argv = (const char **) memcpy (nptr, argv, i * sizeof (const char *)); } argv[i] = va_arg (args, const char *); } envp = va_arg (args, const char *const *); va_end (args); return __execve (path, (char *const *) argv, (char *const *) envp); }