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Annotation of 43BSDReno/usr.bin/window/wwspawn.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Edward Wang at The University of California, Berkeley.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)wwspawn.c  3.15 (Berkeley) 6/6/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "ww.h"
        !            28: #include <sys/signal.h>
        !            29: 
        !            30: /*
        !            31:  * There is a dead lock with vfork and closing of pseudo-ports.
        !            32:  * So we have to be sneaky about error reporting.
        !            33:  */
        !            34: wwspawn(wp, file, argv)
        !            35: register struct ww *wp;
        !            36: char *file;
        !            37: char **argv;
        !            38: {
        !            39:        int pid;
        !            40:        int ret;
        !            41:        char erred = 0;
        !            42:        int s;
        !            43: 
        !            44:        s = sigblock(sigmask(SIGCHLD));
        !            45:        switch (pid = vfork()) {
        !            46:        case -1:
        !            47:                wwerrno = WWE_SYS;
        !            48:                ret = -1;
        !            49:                break;
        !            50:        case 0:
        !            51:                if (wwenviron(wp) >= 0)
        !            52:                        execvp(file, argv);
        !            53:                erred = 1;
        !            54:                _exit(1);
        !            55:        default:
        !            56:                if (erred) {
        !            57:                        wwerrno = WWE_SYS;
        !            58:                        ret = -1;
        !            59:                } else {
        !            60:                        wp->ww_pid = pid;
        !            61:                        wp->ww_state = WWS_HASPROC;
        !            62:                        ret = pid;
        !            63:                }
        !            64:        }
        !            65:        (void) sigsetmask(s);
        !            66:        if (wp->ww_socket >= 0) {
        !            67:                (void) close(wp->ww_socket);
        !            68:                wp->ww_socket = -1;
        !            69:        }
        !            70:        return ret;
        !            71: }

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