diff options
Diffstat (limited to 'iptables/xshared.h')
| -rw-r--r-- | iptables/xshared.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/iptables/xshared.h b/iptables/xshared.h index d8a697ae..539e6c24 100644 --- a/iptables/xshared.h +++ b/iptables/xshared.h @@ -86,7 +86,28 @@ extern struct xtables_match *load_proto(struct iptables_command_state *); extern int subcmd_main(int, char **, const struct subcommand *); extern void xs_init_target(struct xtables_target *); extern void xs_init_match(struct xtables_match *); -bool xtables_lock(int wait, struct timeval *wait_interval); + +/** + * Values for the iptables lock. + * + * A value >= 0 indicates the lock filedescriptor. Other values are: + * + * XT_LOCK_UNSUPPORTED : The system does not support locking, execution will + * proceed lockless. + * + * XT_LOCK_BUSY : The lock was held by another process. xtables_lock only + * returns this value when |wait| == false. If |wait| == true, xtables_lock + * will not return unless the lock has been acquired. + * + * XT_LOCK_NOT_ACQUIRED : We have not yet attempted to acquire the lock. + */ +enum { + XT_LOCK_BUSY = -1, + XT_LOCK_UNSUPPORTED = -2, + XT_LOCK_NOT_ACQUIRED = -3, +}; +extern int xtables_lock(int wait, struct timeval *tv); +extern void xtables_unlock(int lock); int parse_wait_time(int argc, char *argv[]); void parse_wait_interval(int argc, char *argv[], struct timeval *wait_interval); |