| 1 | #include "git-compat-util.h" |
| 2 | #include "parse.h" |
| 3 | #include "run-command.h" |
| 4 | #include "write-or-die.h" |
| 5 | |
| 6 | /* |
| 7 | * Some cases use stdio, but want to flush after the write |
| 8 | * to get error handling (and to get better interactive |
| 9 | * behaviour - not buffering excessively). |
| 10 | * |
| 11 | * Of course, if the flush happened within the write itself, |
| 12 | * we've already lost the error code, and cannot report it any |
| 13 | * more. So we just ignore that case instead (and hope we get |
| 14 | * the right error code on the flush). |
| 15 | * |
| 16 | * If the file handle is stdout, and stdout is a file, then skip the |
| 17 | * flush entirely since it's not needed. |
| 18 | */ |
| 19 | void maybe_flush_or_die(FILE *f, const char *desc) |
| 20 | { |
| 21 | if (f == stdout) { |
| 22 | static int force_flush_stdout = -1; |
| 23 | |
| 24 | if (force_flush_stdout < 0) { |
| 25 | force_flush_stdout = git_env_bool("GIT_FLUSH", -1); |
| 26 | if (force_flush_stdout < 0) { |
| 27 | struct stat st; |
| 28 | if (fstat(fileno(stdout), &st)) |
| 29 | force_flush_stdout = 1; |
| 30 | else |
| 31 | force_flush_stdout = !S_ISREG(st.st_mode); |
| 32 | } |
| 33 | } |
| 34 | if (!force_flush_stdout && !ferror(f)) |
| 35 | return; |
| 36 | } |
| 37 | if (fflush(f)) { |
| 38 | check_pipe(errno); |
| 39 | die_errno("write failure on '%s'", desc); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | void fprintf_or_die(FILE *f, const char *fmt, ...) |
| 44 | { |
| 45 | va_list ap; |
| 46 | int ret; |
| 47 | |
| 48 | va_start(ap, fmt); |
| 49 | ret = vfprintf(f, fmt, ap); |
| 50 | va_end(ap); |
| 51 | |
| 52 | if (ret < 0) { |
| 53 | check_pipe(errno); |
| 54 | die_errno("write error"); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | static int maybe_fsync(int fd) |
| 59 | { |
| 60 | if (use_fsync < 0) |
| 61 | use_fsync = git_env_bool("GIT_TEST_FSYNC", 1); |
| 62 | if (!use_fsync) |
| 63 | return 0; |
| 64 | |
| 65 | if (fsync_method == FSYNC_METHOD_WRITEOUT_ONLY && |
| 66 | git_fsync(fd, FSYNC_WRITEOUT_ONLY) >= 0) |
| 67 | return 0; |
| 68 | |
| 69 | return git_fsync(fd, FSYNC_HARDWARE_FLUSH); |
| 70 | } |
| 71 | |
| 72 | void fsync_or_die(int fd, const char *msg) |
| 73 | { |
| 74 | if (maybe_fsync(fd) < 0) |
| 75 | die_errno("fsync error on '%s'", msg); |
| 76 | } |
| 77 | |
| 78 | int fsync_component(enum fsync_component component, int fd) |
| 79 | { |
| 80 | if (fsync_components & component) |
| 81 | return maybe_fsync(fd); |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | void fsync_component_or_die(enum fsync_component component, int fd, const char *msg) |
| 86 | { |
| 87 | if (fsync_components & component) |
| 88 | fsync_or_die(fd, msg); |
| 89 | } |
| 90 | |
| 91 | void write_or_die(int fd, const void *buf, size_t count) |
| 92 | { |
| 93 | if (write_in_full(fd, buf, count) < 0) { |
| 94 | check_pipe(errno); |
| 95 | die_errno("write error"); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | void fwrite_or_die(FILE *f, const void *buf, size_t count) |
| 100 | { |
| 101 | if (fwrite(buf, 1, count, f) != count) |
| 102 | die_errno("fwrite error"); |
| 103 | } |
| 104 | |
| 105 | void fflush_or_die(FILE *f) |
| 106 | { |
| 107 | if (fflush(f)) |
| 108 | die_errno("fflush error"); |
| 109 | } |