tools: kwboot: Handle EINTR in kwboot_write()

The write() syscall may be interrupted. Handle EINTR and retry it.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/tools/kwboot.c b/tools/kwboot.c
index de433c1..8b748f0 100644 (file)
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -292,13 +292,15 @@ static int blk_rsp_timeo = KWBOOT_BLK_RSP_TIMEO;
 static ssize_t
 kwboot_write(int fd, const char *buf, size_t len)
 {
-       size_t tot = 0;
+       ssize_t tot = 0;
 
        while (tot < len) {
                ssize_t wr = write(fd, buf + tot, len - tot);
 
-               if (wr < 0)
-                       return -1;
+               if (wr < 0 && errno == EINTR)
+                       continue;
+               else if (wr < 0)
+                       return wr;
 
                tot += wr;
        }