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| author | Willy Tarreau <w@1wt.eu> | 2018-07-03 12:10:31 -0400 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2018-08-07 10:53:52 +0200 |
| commit | 4469bd7b53acea642915e2bf0e3cb5dfa378a47e (patch) | |
| tree | f372479f23f3d10e0ee0c68da4be7c2ea6cc567b /tools/kwboot.c | |
| parent | 3475a71d4e7696865ebc710e56621b04d56a621e (diff) | |
| download | u-boot-4469bd7b53acea642915e2bf0e3cb5dfa378a47e.zip u-boot-4469bd7b53acea642915e2bf0e3cb5dfa378a47e.tar.gz u-boot-4469bd7b53acea642915e2bf0e3cb5dfa378a47e.tar.bz2 | |
tools: kwboot: properly quit when read() returns 0
When kwboot is attached to a terminal which disappears such as one
connected via an unplugged USB cable, read() returns 0, making kwboot
loop until a key is pressed in the terminal. The only case where read()
may return 0 here is when the terminal is closed anyway, so let's
properly handle this one and report is similar to other errors.
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'tools/kwboot.c')
| -rw-r--r-- | tools/kwboot.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/kwboot.c b/tools/kwboot.c index 0a77060..50ae2b4 100644 --- a/tools/kwboot.c +++ b/tools/kwboot.c @@ -182,7 +182,7 @@ kwboot_tty_recv(int fd, void *buf, size_t len, int timeo) } n = read(fd, buf, len); - if (n < 0) + if (n <= 0) goto out; buf = (char *)buf + n; @@ -466,7 +466,7 @@ kwboot_term_pipe(int in, int out, char *quit, int *s) char _buf[128], *buf = _buf; nin = read(in, buf, sizeof(buf)); - if (nin < 0) + if (nin <= 0) return -1; if (quit) { |