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ovsdb-server: Maintain the database lock with --detach.

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Before this commit, "ovsdb-server --detach" would detach after it opened
the database file, which meant that the child process did not hold the
file lock on the database file (because a forked child process does not
inherit its parents' locks).  This commit fixes the problem by making
ovsdb-server open the database only after it has detached.  This fix, in
turn, required that daemonize() not chdir to /, because this would break
databases whose names are given relative to the current directory, and so
this commit also changes ovsdb-server to do so later.
This commit is contained in:
Ben Pfaff
2009-11-16 15:09:50 -08:00
parent b93d3b6cb2
commit eb077b264f
3 changed files with 36 additions and 4 deletions
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4
lib/daemon.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2008 Nicira Networks.
* Copyright (c) 2008, 2009 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -55,7 +55,9 @@ char *make_pidfile_name(const char *name);
void set_pidfile(const char *name);
const char *get_pidfile(void);
void set_no_chdir(void);
bool is_chdir_enabled(void);
void set_detach(void);
bool get_detach(void);
void daemonize(void);
void die_if_already_running(void);
void ignore_existing_pidfile(void);