write-or-die.c

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