Some pytests create files in the persistent-data directory. It is useful
to be able to access these files in C tests. Add a function which can
locate a file given its leaf name, using the environment variable set
up in test/py/conftest.py

Signed-off-by: Simon Glass <sjg@chromium.org>

Given a file ../img of size 4294967296 with GPT partition table and
partitions:

=> host bind 0 ../img
=> part list host 0
Disk host-0.blk not ready

The cause is os_filesize() returning int. File sizes must use off_t.

Correct all uses of os_filesize() too.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Add the documentation to avoid a warning with 'make htmldocs'.

Fixes: 10107efedd5 ("sandbox: add SIGALRM-based watchdog device")

Signed-off-by: Simon Glass <sjg@chromium.org>

In order to test that U-Boot actually maintains the watchdog device(s)
during long-running busy-loops, such as those where we wait for the
user to stop autoboot, we need a watchdog device that actually does
something during those loops; we cannot test that behaviour via the DM
test framework.

So introduce a relatively simple watchdog device which is simply based
on calling the host OS' alarm() function; that has the nice property
that a new call to alarm() simply sets a new deadline, and alarm(0)
cancels any existing alarm. These properties are precisely what we
need to implement start/reset/stop. We install our own handler so that
we get a known message printed if and when the watchdog fires, and by
just invoking that handler directly, we get expire_now for free.

The actual calls to the various OS functions (alarm, signal, raise)
need to be done in os.c, and since the driver code cannot get access
to the values of SIGALRM or SIG_DFL (that would require including a
host header, and that's only os.c which can do that), we cannot simply
do trivial wrappers for signal() and raise(), but instead create
specialized functions just for use by this driver.

Apart from enabling this driver for sandbox{,64}_defconfig, also
enable the wdt command which was useful for hand-testing this new
driver (especially with running u-boot under strace).

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

It flushes stdout.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

Before setting up the devices U-Boot's printf() function cannot be used
for console output. Provide function os_printf() to print to stderr.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

U-Boot define loff_t as long long. But the header
/usr/include/linux/types.h may not define it.
This has lead to a build error on Alpine Linux.

So let's use long long instead of loff_t for
the size parameter of function os_get_filesize().

Reported-by: Milan P. Stanić <mps@arvanta.net>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Tested-by: Milan P. Stanić <mps@arvanta.net>
Reviewed-by: Simon Glass <sjg@chromium.org>

Add the opposite of mapping, so that we can unmap and avoid running out of
address space.

Signed-off-by: Simon Glass <sjg@chromium.org>

It is useful to map a file into memory so that it can be accessed using
simple pointers. Add a function to support this.

Signed-off-by: Simon Glass <sjg@chromium.org>

Add a function to return the size of a file. This is useful in situations
where we need to allocate memory for it before reading it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>