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 spawnvpe()              Execute Program Using Arg Array, PATH, Environment

 #include   <process.h>

 int        spawnvpe(modeflag,pathname,argv,envp);
 int        modeflag;                    Execution mode for parent process
 char       *pathname;                   Path name of file to be executed
 char       *argv[];                     Array of pointers to arguments
 char       *envp[];                     Array of pointers to environment
                                          settings

    spawnvpe() operates exactly like spawnve(), with one exception:  If
    'pathname' is not found as described in spawnve(), then spawnvpe()
    uses the current directory, followed by the DOS PATH to continue the
    search for the path name.  Otherwise, the two functions are
    identical; see spawnve() for a complete description.

   Portability:     MS-DOS only.

   -------------------------------- Example ---------------------------------

    The following statements transfer execution to the child process
    "child.exe" and pass it the three arguments "child", "arg1", and
    "arg2".  "child.exe" will be found in the current directory or any
    PATH directory.  If "child.exe" is found, the PATH environment
    variable is set to "C:\\TEST" for the child process.  The exit status
    of the child is printed upon return.

           #include <process.h>    /* for 'spawnvpe' and 'P_WAIT' */
           #include <stdio.h>      /* for 'printf' and 'NULL' */
           #include <errno.h>      /* for 'errno', 'ENOENT' and 'ENOMEM' */

           char *args[] = {"child", "arg1", "arg2", NULL};
           char *env[] = {"PATH=C:\\TEST", NULL};

           main()
           {
               int result;

               result = spawnvpe(P_WAIT, "child.exe", args, env);
               if (result != -1)
                   printf("exit status of child.exe = %d\n", result);
               else {
                   if (errno == ENOENT) {
                       printf("child.exe not found in current directory,\n");
                       printf("  or in any PATH directory.\n");
                   }
                   else if (errno == ENOMEM)
                       printf("not enough memory to execute child.exe\n");
                   else
                       printf("error #%d trying to spawn child.exe\n",
                               errno);
               }
           }