1: /* Copyright (C) 1991,93,96,97,98,99,2002,2005 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 <unistd.h>
   20: #include <stdarg.h>
   21: #include <stddef.h>
   22: #include <stdlib.h>
   23: #include <string.h>
   24: 
   25: #include <stackinfo.h>
   26: 
   27: /* Execute FILE, searching in the `PATH' environment variable if
   28:    it contains no slashes, with all arguments after FILE until a
   29:    NULL pointer and environment from `environ'.  */
   30: int
   31: execlp (const char *file, const char *arg, ...)
   32: {
   33: #define INITIAL_ARGV_MAX 1024
   34:   size_t argv_max = INITIAL_ARGV_MAX;
   35:   const char *initial_argv[INITIAL_ARGV_MAX];
   36:   const char **argv = initial_argv;
   37:   va_list args;
   38: 
   39:   argv[0] = arg;
   40: 
   41:   va_start (args, arg);
   42:   unsigned int i = 0;
   43:   while (argv[i++] != NULL)
   44:     {
   45:       if (i == argv_max)
   46:         {
   47:           argv_max *= 2;
   48:           const char **nptr = realloc (argv == initial_argv ? NULL : argv,
   49:                                        argv_max * sizeof (const char *));
   50:           if (nptr == NULL)
   51:             {
   52:               if (argv != initial_argv)
   53:                 free (argv);
   54:               return -1;
   55:             }
   56:           if (argv == initial_argv)
   57:             /* We have to copy the already filled-in data ourselves.  */
   58:             memcpy (nptr, argv, i * sizeof (const char *));
   59: 
   60:           argv = nptr;
   61:         }
   62: 
   63:       argv[i] = va_arg (args, const char *);
   64:     }
   65:   va_end (args);
   66: 
   67:   int ret = execvp (file, (char *const *) argv);
   68:   if (argv != initial_argv)
   69:     free (argv);
   70: 
   71:   return ret;
   72: }
   73: libc_hidden_def (execlp)