short i/o: fix calls to read to use xread or read_in_full

We have a number of badly checked read() calls.  Often we are
expecting read() to read exactly the size we requested or fail, this
fails to handle interrupts or short reads.  Add a read_in_full()
providing those semantics.  Otherwise we at a minimum need to check
for EINTR and EAGAIN, where this is appropriate use xread().

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/builtin-grep.c b/builtin-grep.c
index 3b1b1cbbfa..2bfbdb7140 100644
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -136,7 +136,7 @@ static int grep_file(struct grep_opt *opt, const char *filename)
 	if (i < 0)
 		goto err_ret;
 	data = xmalloc(st.st_size + 1);
-	if (st.st_size != xread(i, data, st.st_size)) {
+	if (st.st_size != read_in_full(i, data, st.st_size)) {
 		error("'%s': short read %s", filename, strerror(errno));
 		close(i);
 		free(data);