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Annotation of 43BSDReno/lib/libutil/daemon.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)daemon.c   1.2 (Berkeley) 6/29/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/file.h>
        !            25: 
        !            26: daemon(nochdir, noclose)
        !            27:        int nochdir, noclose;
        !            28: {
        !            29:        int cpid;
        !            30: 
        !            31:        if ((cpid = fork()) == -1)
        !            32:                return (-1);
        !            33:        if (cpid)
        !            34:                exit(0);
        !            35:        (void) setsid();
        !            36:        if (!nochdir)
        !            37:                (void) chdir("/");
        !            38:        if (!noclose) {
        !            39:                int devnull = open("/dev/null", O_RDWR, 0);
        !            40: 
        !            41:                if (devnull != -1) {
        !            42:                        (void) dup2(devnull, 0);
        !            43:                        (void) dup2(devnull, 1);
        !            44:                        (void) dup2(devnull, 2);
        !            45:                        if (devnull > 2)
        !            46:                                (void) close(devnull);
        !            47:                }
        !            48:        }
        !            49: }

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