annotate dcclib/daemon.c @ 4:d329bb5c36d0

Changes making it compile the new upstream release
author Peter Gervai <grin@grin.hu>
date Tue, 10 Mar 2009 14:57:12 +0100 (2009-03-10)
parents c7f6b056b673
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1 /* compatibility hack for old systems lacking daemon() */
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2
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3 #include "dcc_config.h"
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4 #include "dcc_paths.h"
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5
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6 #include <stdio.h>
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7 #include <unistd.h>
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8 #include <stdlib.h>
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9 #include <fcntl.h>
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10
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11 int
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12 dcc_daemon(int nochdir, int noclose)
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13 {
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14 int retv;
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15
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16 if (!nochdir) {
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17 if (chdir("/") == -1)
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18 perror("chdir /");
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19 }
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20 retv = fork();
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21 if (retv == -1)
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22 return -1; /* fork() failed */
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23
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24 if (retv != 0)
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25 _exit(0); /* parent of new child */
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26
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27 /* fork again after setsid() so that the PID is not the session
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28 * group leader so that opening a tty device won't make a
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29 * controlling terminal. */
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30 setsid();
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31 retv = fork();
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32 if (retv == -1) {
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33 perror("fork"); /* second fork() failed */
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34 exit(1); /* cannot tell caller */
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35 }
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36 if (retv != 0)
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37 _exit(0); /* parent of final child */
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38
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39 if (!noclose) {
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40 close(0);
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41 close(1);
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42 close(2);
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43 open(_PATH_DEVNULL, O_RDWR, 0666);
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44 dup2(0, 1);
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45 dup2(0, 2);
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46 }
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47 return 0;
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48 }