X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=write_or_die.c;h=e125e11d3b63e3dab9077d7b414e83e7ff7d16ad;hb=7ae512b7da17e8f8c474fa80fb44b023c6f83882;hp=5c4bc8515ab9484131de7e065e08657315004f8c;hpb=460ca302fdf453459850676c049ed7b46b43a0d4;p=git.git

diff --git a/write_or_die.c b/write_or_die.c
index 5c4bc8515..e125e11d3 100644
--- a/write_or_die.c
+++ b/write_or_die.c
@@ -1,5 +1,45 @@
 #include "cache.h"
 
+/*
+ * 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)
+{
+	static int skip_stdout_flush = -1;
+	struct stat st;
+	char *cp;
+
+	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)) {
+		if (errno == EPIPE)
+			exit(0);
+		die("write failure on %s: %s", desc, strerror(errno));
+	}
+}
+
 int read_in_full(int fd, void *buf, size_t count)
 {
 	char *p = buf;