From 5e696e022d8383bc7abe6e6ba37c2664679fe81f Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Thu, 11 Jun 2009 19:34:50 +0200 Subject: conntrackd: allow to limit the number of simultaneous child processes This patch allows to limit the number of simultaneous child processes. This is required by the next patch that replaces disposable handlers to commit and flush with permanent handlers. Signed-off-by: Pablo Neira Ayuso --- src/process.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'src/process.c') diff --git a/src/process.c b/src/process.c index 31e6e6f..c378f7a 100644 --- a/src/process.c +++ b/src/process.c @@ -22,20 +22,32 @@ static LIST_HEAD(process_list); -int fork_process_new(void (*cb)(void *data), void *data) +int fork_process_new(int type, int flags, void (*cb)(void *data), void *data) { - struct child_process *c; + struct child_process *c, *this; int pid; /* block SIGCHLD to avoid the access of the list concurrently */ sigprocmask(SIG_BLOCK, &STATE(block), NULL); + /* We only want one process of this type at the same time. This is + * useful if you want to prevent two child processes from accessing + * a shared descriptor at the same time. */ + if (flags & CTD_PROC_F_EXCL) { + list_for_each_entry(this, &process_list, head) { + if (this->type == type) { + sigprocmask(SIG_UNBLOCK, &STATE(block), NULL); + return -1; + } + } + } c = calloc(sizeof(struct child_process), 1); if (c == NULL) { sigprocmask(SIG_UNBLOCK, &STATE(block), NULL); return -1; } + c->type = type; c->cb = cb; c->data = data; c->pid = pid = fork(); -- cgit v1.2.3