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Commit | Line | Data |
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7230e6d0 RS |
1 | #include "cache.h" |
2 | ||
06f59e9f TT |
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 | */ | |
16 | void 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)) { | |
37 | if (errno == EPIPE) | |
38 | exit(0); | |
39 | die("write failure on %s: %s", desc, strerror(errno)); | |
40 | } | |
41 | } | |
42 | ||
0104ca09 | 43 | ssize_t read_in_full(int fd, void *buf, size_t count) |
75025ccd SP |
44 | { |
45 | char *p = buf; | |
93d26e4c | 46 | ssize_t total = 0; |
75025ccd SP |
47 | |
48 | while (count > 0) { | |
4494c656 LT |
49 | ssize_t loaded = xread(fd, p, count); |
50 | if (loaded <= 0) | |
51 | return total ? total : loaded; | |
75025ccd SP |
52 | count -= loaded; |
53 | p += loaded; | |
93d26e4c | 54 | total += loaded; |
75025ccd | 55 | } |
93d26e4c AW |
56 | |
57 | return total; | |
58 | } | |
59 | ||
0104ca09 | 60 | ssize_t write_in_full(int fd, const void *buf, size_t count) |
7230e6d0 RS |
61 | { |
62 | const char *p = buf; | |
93822c22 | 63 | ssize_t total = 0; |
7230e6d0 RS |
64 | |
65 | while (count > 0) { | |
d848804a | 66 | ssize_t written = xwrite(fd, p, count); |
f6aa66cb LT |
67 | if (written < 0) |
68 | return -1; | |
69 | if (!written) { | |
70 | errno = ENOSPC; | |
71 | return -1; | |
7230e6d0 RS |
72 | } |
73 | count -= written; | |
74 | p += written; | |
93822c22 | 75 | total += written; |
7230e6d0 | 76 | } |
93822c22 AW |
77 | |
78 | return total; | |
7230e6d0 | 79 | } |
7cf67205 | 80 | |
4c81b03e LT |
81 | void fsync_or_die(int fd, const char *msg) |
82 | { | |
83 | if (fsync(fd) < 0) { | |
84 | die("%s: fsync error (%s)", msg, strerror(errno)); | |
85 | } | |
86 | } | |
87 | ||
93822c22 | 88 | void write_or_die(int fd, const void *buf, size_t count) |
7cf67205 | 89 | { |
d34cf19b | 90 | if (write_in_full(fd, buf, count) < 0) { |
93822c22 AW |
91 | if (errno == EPIPE) |
92 | exit(0); | |
93 | die("write error (%s)", strerror(errno)); | |
e0814056 | 94 | } |
e0814056 AW |
95 | } |
96 | ||
97 | int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg) | |
98 | { | |
d34cf19b | 99 | if (write_in_full(fd, buf, count) < 0) { |
e0814056 AW |
100 | if (errno == EPIPE) |
101 | exit(0); | |
102 | fprintf(stderr, "%s: write error (%s)\n", | |
103 | msg, strerror(errno)); | |
104 | return 0; | |
7cf67205 CC |
105 | } |
106 | ||
107 | return 1; | |
108 | } | |
825cee7b | 109 | |
e0814056 | 110 | int write_or_whine(int fd, const void *buf, size_t count, const char *msg) |
825cee7b | 111 | { |
d34cf19b | 112 | if (write_in_full(fd, buf, count) < 0) { |
e0814056 AW |
113 | fprintf(stderr, "%s: write error (%s)\n", |
114 | msg, strerror(errno)); | |
115 | return 0; | |
825cee7b AW |
116 | } |
117 | ||
118 | return 1; | |
119 | } |