usr/src/usr.bin/window/wwspawn.c

#ifndef lint
static char sccsid[] = "@(#)wwspawn.c   3.11 %G%";
#endif

/*
 * Copyright (c) 1983 Regents of the University of California,
 * All rights reserved.  Redistribution permitted subject to
 * the terms of the Berkeley Software License Agreement.
 */

#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;
}