#include "cache.h"
-int read_in_full(int fd, void *buf, size_t count)
+/*
+ * Some cases use stdio, but want to flush after the write
+ * to get error handling (and to get better interactive
+ * behaviour - not buffering excessively).
+ *
+ * Of course, if the flush happened within the write itself,
+ * we've already lost the error code, and cannot report it any
+ * more. So we just ignore that case instead (and hope we get
+ * the right error code on the flush).
+ *
+ * If the file handle is stdout, and stdout is a file, then skip the
+ * flush entirely since it's not needed.
+ */
+void maybe_flush_or_die(FILE *f, const char *desc)
{
- char *p = buf;
- ssize_t total = 0;
+ static int skip_stdout_flush = -1;
+ struct stat st;
+ char *cp;
- while (count > 0) {
- ssize_t loaded = xread(fd, p, count);
- if (loaded <= 0)
- return total ? total : loaded;
- count -= loaded;
- p += loaded;
- total += loaded;
+ if (f == stdout) {
+ if (skip_stdout_flush < 0) {
+ cp = getenv("GIT_FLUSH");
+ if (cp)
+ skip_stdout_flush = (atoi(cp) == 0);
+ else if ((fstat(fileno(stdout), &st) == 0) &&
+ S_ISREG(st.st_mode))
+ skip_stdout_flush = 1;
+ else
+ skip_stdout_flush = 0;
+ }
+ if (skip_stdout_flush && !ferror(f))
+ return;
+ }
+ if (fflush(f)) {
+ /*
+ * On Windows, EPIPE is returned only by the first write()
+ * after the reading end has closed its handle; subsequent
+ * write()s return EINVAL.
+ */
+ if (errno == EPIPE || errno == EINVAL)
+ exit(0);
+ die_errno("write failure on '%s'", desc);
}
-
- return total;
}
-int write_in_full(int fd, const void *buf, size_t count)
+void fsync_or_die(int fd, const char *msg)
{
- const char *p = buf;
- ssize_t total = 0;
-
- while (count > 0) {
- ssize_t written = xwrite(fd, p, count);
- if (written < 0)
- return -1;
- if (!written) {
- errno = ENOSPC;
- return -1;
- }
- count -= written;
- p += written;
- total += written;
+ if (fsync(fd) < 0) {
+ die_errno("fsync error on '%s'", msg);
}
-
- return total;
}
void write_or_die(int fd, const void *buf, size_t count)
if (write_in_full(fd, buf, count) < 0) {
if (errno == EPIPE)
exit(0);
- die("write error (%s)", strerror(errno));
+ die_errno("write error");
}
}