write_or_die.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3
   4 /*
   5  * Some cases use stdio, but want to flush after the write
   6  * to get error handling (and to get better interactive
   7  * behaviour - not buffering excessively).
   8  *
   9  * Of course, if the flush happened within the write itself,
  10  * we've already lost the error code, and cannot report it any
  11  * more. So we just ignore that case instead (and hope we get
  12  * the right error code on the flush).
  13  *
  14  * If the file handle is stdout, and stdout is a file, then skip the
  15  * flush entirely since it's not needed.
  16  */
  17 void maybe_flush_or_die(FILE *f, const char *desc)
  18 {
  19         static int skip_stdout_flush = -1;
  20         struct stat st;
  21         char *cp;
  22
  23         if (f == stdout) {
  24                 if (skip_stdout_flush < 0) {
  25                         cp = getenv("GIT_FLUSH");
  26                         if (cp)
  27                                 skip_stdout_flush = (atoi(cp) == 0);
  28                         else if ((fstat(fileno(stdout), &st) == 0) &&
  29                                  S_ISREG(st.st_mode))
  30                                 skip_stdout_flush = 1;
  31                         else
  32                                 skip_stdout_flush = 0;
  33                 }
  34                 if (skip_stdout_flush && !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 void fsync_or_die(int fd, const char *msg)
  59 {
  60         if (fsync(fd) < 0) {
  61                 die_errno("fsync error on '%s'", msg);
  62         }
  63 }
  64
  65 void write_or_die(int fd, const void *buf, size_t count)
  66 {
  67         if (write_in_full(fd, buf, count) < 0) {
  68                 check_pipe(errno);
  69                 die_errno("write error");
  70         }
  71 }