[PATCH] writev: update comment on preserving errno

[PATCH] writev: update comment on preserving errno

[Eric Wong]

Studying malloc implementations for a while, it's completely
reasonable for "free" to alter errno when making syscalls
to release/compact memory.
---
 ext/kgio/writev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/ext/kgio/writev.c b/ext/kgio/writev.c
index 027cdb5..d3ec53e 100644
--- a/ext/kgio/writev.c
+++ b/ext/kgio/writev.c
@@ -90,8 +90,7 @@ static ssize_t custom_writev(int fd, const struct iovec *vec, int iov_cnt, size_
 
 	result = write(fd, buf, total_len);
 
-	/* well, it seems that `free` could not change errno
-	 * but lets save it anyway */
+	/* free() may alter errno */
 	i = errno;
 	free(buf);
 	errno = i;
-- 
EW