die_errno(): double % in strerror() output just in case
[git/git.git] / write_or_die.c
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1#include "cache.h"
2
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3/*
4 * Some cases use stdio, but want to flush after the write
5 * to get error handling (and to get better interactive
6 * behaviour - not buffering excessively).
7 *
8 * Of course, if the flush happened within the write itself,
9 * we've already lost the error code, and cannot report it any
10 * more. So we just ignore that case instead (and hope we get
11 * the right error code on the flush).
12 *
13 * If the file handle is stdout, and stdout is a file, then skip the
14 * flush entirely since it's not needed.
15 */
16void maybe_flush_or_die(FILE *f, const char *desc)
17{
18 static int skip_stdout_flush = -1;
19 struct stat st;
20 char *cp;
21
22 if (f == stdout) {
23 if (skip_stdout_flush < 0) {
24 cp = getenv("GIT_FLUSH");
25 if (cp)
26 skip_stdout_flush = (atoi(cp) == 0);
27 else if ((fstat(fileno(stdout), &st) == 0) &&
28 S_ISREG(st.st_mode))
29 skip_stdout_flush = 1;
30 else
31 skip_stdout_flush = 0;
32 }
33 if (skip_stdout_flush && !ferror(f))
34 return;
35 }
36 if (fflush(f)) {
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37 /*
38 * On Windows, EPIPE is returned only by the first write()
39 * after the reading end has closed its handle; subsequent
40 * write()s return EINVAL.
41 */
42 if (errno == EPIPE || errno == EINVAL)
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43 exit(0);
44 die("write failure on %s: %s", desc, strerror(errno));
45 }
46}
47
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48void fsync_or_die(int fd, const char *msg)
49{
50 if (fsync(fd) < 0) {
51 die("%s: fsync error (%s)", msg, strerror(errno));
52 }
53}
54
93822c22 55void write_or_die(int fd, const void *buf, size_t count)
7cf67205 56{
d34cf19b 57 if (write_in_full(fd, buf, count) < 0) {
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58 if (errno == EPIPE)
59 exit(0);
60 die("write error (%s)", strerror(errno));
e0814056 61 }
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62}
63
64int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
65{
d34cf19b 66 if (write_in_full(fd, buf, count) < 0) {
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67 if (errno == EPIPE)
68 exit(0);
69 fprintf(stderr, "%s: write error (%s)\n",
70 msg, strerror(errno));
71 return 0;
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72 }
73
74 return 1;
75}
825cee7b 76
e0814056 77int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
825cee7b 78{
d34cf19b 79 if (write_in_full(fd, buf, count) < 0) {
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80 fprintf(stderr, "%s: write error (%s)\n",
81 msg, strerror(errno));
82 return 0;
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83 }
84
85 return 1;
86}