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Annotation of 43BSDReno/lib/libutil/daemon.c, revision 1.1.1.1

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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