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tools: kwboot: Disable non-blocking mode

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The kwboot utility does not handle EAGAIN / EBUSY errors, it expects
blocking mode on tty - it uses select() to check if data is available.

Disable non-blocking mode by clearing O_NDELAY flag which was set by
open().

We can't just take O_NDELAY from open(), because it is required there
until the CLOCAL flag is set on the tty.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Pali Rohár
2021-09-24 23:07:10 +02:00
committed by Stefan Roese
parent 24a471bc4b
commit 911515b339
1 changed files with 9 additions and 1 deletions
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10
tools/kwboot.c
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@@ -639,7 +639,7 @@ baud_fail:
static int
kwboot_open_tty(const char *path, int baudrate)
{
int rc, fd;
int rc, fd, flags;
struct termios tio;
rc = -1;
@@ -661,6 +661,14 @@ kwboot_open_tty(const char *path, int baudrate)
if (rc)
goto out;
flags = fcntl(fd, F_GETFL);
if (flags < 0)
goto out;
rc = fcntl(fd, F_SETFL, flags & ~O_NDELAY);
if (rc)
goto out;
rc = kwboot_tty_change_baudrate(fd, baudrate);
if (rc)
goto out;