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comparison output.c @ 20:40748b097655

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add output.
author David A. Holland
date Mon, 20 Dec 2010 04:03:35 -0500
parents
children e3fab8f1b52c
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19:f9792a9ec704 20:40748b097655
1 #include <unistd.h>
2 #include <fcntl.h>
3 #include <err.h>
4
5 #include "utils.h"
6 #include "mode.h"
7 #include "output.h"
8
9 static int outputfd = -1;
10
11 static
12 void
13 output_open(void)
14 {
15 outputfd = open(mode.output_file, O_WRONLY|O_CREAT|O_TRUNC, 0664);
16 if (outputfd < 0) {
17 warn("%s", mode.output_file);
18 die();
19 }
20 }
21
22 void
23 output(const char *buf, size_t len)
24 {
25 size_t done;
26 ssize_t result;
27 static unsigned write_errors = 0;
28
29 if (outputfd < 0) {
30 output_open();
31 }
32
33 /* XXX this will often come by ones and twos, should buffer */
34
35 done = 0;
36 while (done < len) {
37 result = write(outputfd, buf+done, len-done);
38 if (result == -1) {
39 warn("%s: write", mode.output_file);
40 complain_failed();
41 write_errors++;
42 if (write_errors > 5) {
43 warnx("%s: giving up", mode.output_file);
44 die();
45 }
46 /* XXX is this really a good idea? */
47 sleep(1);
48 }
49 done += (size_t)result;
50 }
51 }
52
53 void
54 output_eof(void)
55 {
56 if (outputfd >= 0) {
57 close(outputfd);
58 }
59 outputfd = -1;
60 }