33 lines
827 B
C
33 lines
827 B
C
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/* Copyright (C) 2003 Red Hat, Inc.
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*
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* This software may be freely redistributed under the terms of the GNU
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* public license.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/stat.h>
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int
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main (void)
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{
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struct stat st;
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long int n;
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if (stat ("/etc/hostid", &st) == 0 && S_ISREG (st.st_mode)
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&& st.st_size >= sizeof (n))
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return 0;
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int fd = open ("/dev/random", O_RDONLY);
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if (fd == -1 || read (fd, &n, sizeof (n)) != sizeof (n))
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{
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srand48 ((long int) time (NULL) ^ (long int) getpid ());
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n = lrand48 ();
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}
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return sethostid (n);
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}
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