install approved copyright notice

[unix-history] / usr / src / usr.bin / window / wwspawn.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
static char sccsid[] = "@(#)wwspawn.c   3.13 (Berkeley) %G%";
#endif /* not lint */

#include "ww.h"
#include <sys/signal.h>

/*
* There is a dead lock with vfork and closing of pseudo-ports.
* So we have to be sneaky about error reporting.
*/
wwspawn(wp, file, argv)
register struct ww *wp;
char *file;
char **argv;
{
       int pid;
       int ret;
       char erred = 0;
       int s;

       s = sigblock(sigmask(SIGCHLD));
       switch (pid = vfork()) {
       case -1:
               wwerrno = WWE_SYS;
               ret = -1;
               break;
       case 0:
               if (wwenviron(wp) >= 0)
                       execvp(file, argv);
               erred = 1;
               _exit(1);
       default:
               if (erred) {
                       wwerrno = WWE_SYS;
                       ret = -1;
               } else {
                       wp->ww_pid = pid;
                       wp->ww_state = WWS_HASPROC;
                       ret = pid;
               }
       }
       (void) sigsetmask(s);
       if (wp->ww_socket >= 0) {
               (void) close(wp->ww_socket);
               wp->ww_socket = -1;
       }
       return ret;
}