Update draft release notes to 2.2
[git/git.git] / write_or_die.c
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1#include "cache.h"
2
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3static void check_pipe(int err)
4{
5 if (err == EPIPE) {
6 signal(SIGPIPE, SIG_DFL);
7 raise(SIGPIPE);
8 /* Should never happen, but just in case... */
9 exit(141);
10 }
11}
12
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13/*
14 * Some cases use stdio, but want to flush after the write
15 * to get error handling (and to get better interactive
16 * behaviour - not buffering excessively).
17 *
18 * Of course, if the flush happened within the write itself,
19 * we've already lost the error code, and cannot report it any
20 * more. So we just ignore that case instead (and hope we get
21 * the right error code on the flush).
22 *
23 * If the file handle is stdout, and stdout is a file, then skip the
24 * flush entirely since it's not needed.
25 */
26void maybe_flush_or_die(FILE *f, const char *desc)
27{
28 static int skip_stdout_flush = -1;
29 struct stat st;
30 char *cp;
31
32 if (f == stdout) {
33 if (skip_stdout_flush < 0) {
34 cp = getenv("GIT_FLUSH");
35 if (cp)
36 skip_stdout_flush = (atoi(cp) == 0);
37 else if ((fstat(fileno(stdout), &st) == 0) &&
38 S_ISREG(st.st_mode))
39 skip_stdout_flush = 1;
40 else
41 skip_stdout_flush = 0;
42 }
43 if (skip_stdout_flush && !ferror(f))
44 return;
45 }
46 if (fflush(f)) {
756e676c 47 check_pipe(errno);
d824cbba 48 die_errno("write failure on '%s'", desc);
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49 }
50}
51
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52void fsync_or_die(int fd, const char *msg)
53{
54 if (fsync(fd) < 0) {
d824cbba 55 die_errno("fsync error on '%s'", msg);
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56 }
57}
58
93822c22 59void write_or_die(int fd, const void *buf, size_t count)
7cf67205 60{
d34cf19b 61 if (write_in_full(fd, buf, count) < 0) {
756e676c 62 check_pipe(errno);
d824cbba 63 die_errno("write error");
e0814056 64 }
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65}
66
67int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
68{
d34cf19b 69 if (write_in_full(fd, buf, count) < 0) {
756e676c 70 check_pipe(errno);
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71 fprintf(stderr, "%s: write error (%s)\n",
72 msg, strerror(errno));
73 return 0;
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74 }
75
76 return 1;
77}
825cee7b 78
e0814056 79int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
825cee7b 80{
d34cf19b 81 if (write_in_full(fd, buf, count) < 0) {
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82 fprintf(stderr, "%s: write error (%s)\n",
83 msg, strerror(errno));
84 return 0;
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85 }
86
87 return 1;
88}