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tests/webserver: rework locking of pid file.

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Michael
This commit is contained in:
Michael Adam 2009-09-10 10:27:00 +02:00
parent 449af292dc
commit 974be68476
1 changed files with 27 additions and 5 deletions
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32
tests/scripts/webserver.pl
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@ -171,15 +171,37 @@ sub reopen_logs() {
} }
sub get_pid_lock() { sub get_pid_lock() {
open LOCKFILE, "> $pid_file" or # first make sure the file exists
die "Error opening pid-file $pid_file: $!"; open(LOCKFILE_W, ">> $pid_file") or
die "Error opening pid file '$pid_file' for writing: $!";
# open for reading and try to lock:
open(LOCKFILE, "< $pid_file") or
die "Error opening pid file '$pid_file' for reading: $!";
unless (flock(LOCKFILE, LOCK_EX|LOCK_NB)) { unless (flock(LOCKFILE, LOCK_EX|LOCK_NB)) {
my $other_pid = qx(cat $pid_file); print "pid file '$pid_file' is already locked.\n";
print "Webserver is already running (pid $other_pid)"; my $other_pid = <LOCKFILE>;
if (!defined($other_pid)) {
print "Error reading from pid file.\n";
} else {
chomp($other_pid);
if (!$other_pid) {
print "pid file is empty.\n";
} else {
print "Webserver is already running with pid '$other_pid'.\n";
}
}
close LOCKFILE;
exit(0); exit(0);
} }
print LOCKFILE "$$"; # now re-open for recreating the file and write our pid
close(LOCKFILE_W);
open(LOCKFILE_W, "> $pid_file") or
die "Error opening pid file '$pid_file' for writing: $!";
LOCKFILE_W->autoflush(1);
print LOCKFILE_W "$$";
close(LOCKFILE_W);
} }
sub release_pid_lock() { sub release_pid_lock() {