net: Define named constant for nlmsg_seq

For better readability.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

include/libnetlink.h

@@ -59,6 +59,8 @@ struct rtattr {
 
 #define NLMSG_MIN_TYPE          0x10    /* < 0x10: reserved control messages */
 
+#define CR_NLMSG_SEQ		24680	/* arbitrary chosen */
+
 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 extern int nlmsg_receive(char *buf, int len, int (*cb)(struct nlmsghdr *));
 

libnetlink.c

@@ -23,7 +23,7 @@ int nlmsg_receive(char *buf, int len, int (*cb)(struct nlmsghdr *))
 	struct nlmsghdr *hdr;
 
 	for (hdr = (struct nlmsghdr *)buf; NLMSG_OK(hdr, len); hdr = NLMSG_NEXT(hdr, len)) {
-		if (hdr->nlmsg_seq != 24680)
+		if (hdr->nlmsg_seq != CR_NLMSG_SEQ)
 			continue;
 		if (hdr->nlmsg_type == NLMSG_DONE)
 			return 0;

sockets.c

@@ -333,7 +333,7 @@ static int collect_unix_sockets(int nl)
 	req.hdr.nlmsg_len = sizeof(req);
 	req.hdr.nlmsg_type = SOCK_DIAG_BY_FAMILY;
 	req.hdr.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
-	req.hdr.nlmsg_seq = 24680;
+	req.hdr.nlmsg_seq = CR_NLMSG_SEQ;
 	req.r.sdiag_family = AF_UNIX;
 	req.r.udiag_states = -1; /* All */
 	req.r.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_VFS | UDIAG_SHOW_PEER | UDIAG_SHOW_ICONS | UDIAG_SHOW_RQLEN;