qemu-e2k/storage-daemon
Hanna Reitz 9d8f8233b9 qsd: Unlink absolute PID file path
After writing the PID file, we register an atexit() handler to unlink it
when the process terminates.  However, if the process has changed its
working directory in the meantime (e.g. in os_setup_post() when
daemonizing), this will not work when the PID file path was relative.
Therefore, pass the absolute path (created with realpath()) to the
unlink() call in the atexit() handler.

(realpath() needs a path pointing to an existing file, so we cannot use
it before qemu_write_pidfile().)

Reproducer:
$ cd /tmp
$ qemu-storage-daemon --daemonize --pidfile qsd.pid
$ file qsd.pid
qsd.pid: ASCII text
$ kill $(cat qsd.pid)
$ file qsd.pid
qsd.pid: ASCII text

(qsd.pid should be gone after the process has terminated.)

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2092322
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220609122701.17172-2-hreitz@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2022-07-12 14:30:38 +02:00
..
qapi qapi/qom: Add ObjectOptions for authz-* 2021-03-19 10:17:13 +01:00
meson.build storage-daemon: Add missing build dependency to the vhost-user-blk-test 2021-08-11 13:39:50 +02:00
qemu-storage-daemon.c qsd: Unlink absolute PID file path 2022-07-12 14:30:38 +02:00