1 files changed, 103 insertions, 0 deletions
diff --git a/src/process.c b/src/process.c
new file mode 100644
index 0000000..9b9734c
--- /dev/null
+++ b/src/process.c
@@ -0,0 +1,103 @@
+/*
+ * (C) 2009 by Pablo Neira Ayuso <pablo@netfilter.org>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <signal.h>
+#include "conntrackd.h"
+#include "process.h"
+
+static LIST_HEAD(process_list);
+
+int fork_process_new(int type, int flags, void (*cb)(void *data), void *data)
+{
+	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();
+
+	if (c->pid > 0)
+		list_add(&c->head, &process_list);
+
+	sigprocmask(SIG_UNBLOCK, &STATE(block), NULL);
+
+	return pid;
+}
+
+int fork_process_delete(int pid)
+{
+	struct child_process *this, *tmp;
+
+	list_for_each_entry_safe(this, tmp, &process_list, head) {
+		if (this->pid == pid) {
+			list_del(&this->head);
+			if (this->cb) {
+				this->cb(this->data);
+			}
+			free(this);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static const char *process_type_to_name[CTD_PROC_MAX] = {
+	[CTD_PROC_ANY]		= "any",
+	[CTD_PROC_FLUSH]	= "flush",
+	[CTD_PROC_COMMIT]	= "commit",
+};
+
+void fork_process_dump(int fd)
+{
+	struct child_process *this;
+	char buf[4096];
+	int size = 0;
+
+	sigprocmask(SIG_BLOCK, &STATE(block), NULL);
+	list_for_each_entry(this, &process_list, head) {
+		size += snprintf(buf+size, sizeof(buf),
+				 "PID=%u type=%s\n",
+				 this->pid,
+				 this->type < CTD_PROC_MAX ?
+				 process_type_to_name[this->type] : "unknown");
+	}
+	sigprocmask(SIG_UNBLOCK, &STATE(block), NULL);
+
+	send(fd, buf, size, 0);
+}