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device: loop around flock/warn

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Loop around the flock(), sleeping in the middle. This allows CDBA to
break early if user closes the terminal (by killing SSH or by Ctrl-A-Q
sequence).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Dmitry Baryshkov
2024-05-21 20:12:21 +03:00
parent 02210fe6e2
commit 5db3df360a
1 changed files with 13 additions and 7 deletions
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20
device.c
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@@ -64,15 +64,21 @@ static void device_lock(struct device *device)
if (fd < 0)
err(1, "failed to open lockfile %s", lock);
n = flock(fd, LOCK_EX | LOCK_NB);
if (!n)
return;
while (1) {
char c;
warnx("board is in use, waiting...");
n = flock(fd, LOCK_EX | LOCK_NB);
if (!n)
return;
n = flock(fd, LOCK_EX);
if (n < 0)
err(1, "failed to lock lockfile %s", lock);
warnx("board is in use, waiting...");
sleep(3);
/* check that connection isn't gone */
if (read(STDIN_FILENO, &c, 1) == 0)
errx(1, "connection is gone");
}
}
static bool device_check_access(struct device *device,