ExternalVendorCode/serval-dna
1
0
Fork 0
mirror of https://github.com/servalproject/serval-dna.git synced 2025-01-28 23:23:54 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Special return code for "socket closed"

Browse Source 
Blocking recv calls return a special return code (-2) for notifying the socket
is closed (this information is useful for MDP socket users).

This implementation is unsatisfactory: return code should instead be consistent
with recvfrom(), that is always returning the length of received data (0 for
socket closed).
This commit is contained in:
Romain Vimont (®om) 2013-02-21 16:30:13 +01:00 committed by Jeremy Lakeman
parent 927a35d879
commit 6783656179
2 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
mdp_client.c
View File

@ -160,7 +160,7 @@ int overlay_mdp_recv(int mdp_sockfd, overlay_mdp_frame *mdp, int port, int *ttl)
mdp->packetTypeAndFlags = 0;
len = recvwithttl(mdp_sockfd, (unsigned char *)mdp, sizeof(overlay_mdp_frame), ttl, (struct sockaddr *)&recvaddr, &recvaddrlen);
if (len <= 0)
return -1; // no packet received
return -2; // no packet received
// If the received address overflowed the buffer, then it cannot have come from the server, whose
// address always fits within a struct sockaddr_un.

15
mdp_jni.c
View File

@ -300,6 +300,8 @@ Java_org_servalproject_servald_mdp_MeshSocket__1receive(JNIEnv * env,
jbyteArray jbuf, jsid;
jbyte *sid;
overlay_mdp_frame mdp;
int res;
char *msg;
/* fd = this.fd; */
fd = (*env)->GetIntField(env, this, f_meshsocket_fd);
@ -311,10 +313,15 @@ Java_org_servalproject_servald_mdp_MeshSocket__1receive(JNIEnv * env,
length = (*env)->GetIntField(env, mdppack, f_meshpacket_length);
/* Receive data. */
if (overlay_mdp_recv(fd, &mdp, localport, &ttl)) {
(*env)->ThrowNew(env, cl_meshsocketexception,
"Cannot receive data from servald");
WHY("Cannot receive data from servald");
if (res = (overlay_mdp_recv(fd, &mdp, localport, &ttl))) {
if (res == -2) {
/* Socket is closed. */
msg = "Socket closed";
} else {
msg = "Cannot receive data from servald";
}
(*env)->ThrowNew(env, cl_meshsocketexception, msg);
WHY(msg);
return;
}