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Jason Andryuk
b72682c602
Replace the perl locking check with stat(1). Stat is able to fstat stdin (file descriptor 0) when passed '-' as an argument. This is now used to check $_lockfd. stat(1) support for '-' was introduced to coreutils in 2009. After A releases its lock, script B will return from flock and execute stat. Since the lockfile has been removed by A, stat prints an error to stderr and exits non-zero. Redirect stderr to /dev/null to avoid filling /var/log/xen/xen-hotplug.log with "No such file or directory" messages. Placing the stat call inside the "if" condition ensures we only check the stat output when the command completed successfully. This change removes the only runtime dependency of the xen toolstack on perl. Suggested-by: Ian Jackson <ian.jackson@citrix.com> Signed-off-by: Jason Andryuk <jandryuk@gmail.com> Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>