make error messages a little better, use constants in unistd.h

[unix-history] / usr / src / lib / libc / gen / daemon.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)daemon.c    5.2 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/file.h>

daemon(nochdir, noclose)
       int nochdir, noclose;
{
       int cpid;

       if ((cpid = fork()) == -1)
               return (-1);
       if (cpid)
               exit(0);
       (void) setsid();
       if (!nochdir)
               (void) chdir("/");
       if (!noclose) {
               int devnull = open("/dev/null", O_RDWR, 0);

               if (devnull != -1) {
                       (void) dup2(devnull, 0);
                       (void) dup2(devnull, 1);
                       (void) dup2(devnull, 2);
                       if (devnull > 2)
                               (void) close(devnull);
               }
       }
}