bash: teach 'git reset --patch'
[git/spearce.git] / write_or_die.c
blobd45b536021e15c5a674f7969be39f238194bef99
1 #include "cache.h"
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).
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).
13 * If the file handle is stdout, and stdout is a file, then skip the
14 * flush entirely since it's not needed.
16 void maybe_flush_or_die(FILE *f, const char *desc)
18 static int skip_stdout_flush = -1;
19 struct stat st;
20 char *cp;
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;
33 if (skip_stdout_flush && !ferror(f))
34 return;
36 if (fflush(f)) {
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.
42 if (errno == EPIPE || errno == EINVAL)
43 exit(0);
44 die_errno("write failure on '%s'", desc);
48 void fsync_or_die(int fd, const char *msg)
50 if (fsync(fd) < 0) {
51 die_errno("fsync error on '%s'", msg);
55 void write_or_die(int fd, const void *buf, size_t count)
57 if (write_in_full(fd, buf, count) < 0) {
58 if (errno == EPIPE)
59 exit(0);
60 die_errno("write error");
64 int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
66 if (write_in_full(fd, buf, count) < 0) {
67 if (errno == EPIPE)
68 exit(0);
69 fprintf(stderr, "%s: write error (%s)\n",
70 msg, strerror(errno));
71 return 0;
74 return 1;
77 int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
79 if (write_in_full(fd, buf, count) < 0) {
80 fprintf(stderr, "%s: write error (%s)\n",
81 msg, strerror(errno));
82 return 0;
85 return 1;