[ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
[ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
[ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket",
+ [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found",
[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists",
[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
[ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
[ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed",
+ [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found",
+ [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed",
[ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready",
[ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds",
[ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds",
return ret;
}
+
+/*
+ * Receives a single fd from socket.
+ *
+ * Returns the size of received data
+ */
+ssize_t lttcomm_recv_fds_unix_sock(int sock, void *buf, int *fds,
+ size_t nb_fd, size_t len)
+{
+ struct iovec iov[1];
+ int data_fd, i, ret = 0;
+ struct cmsghdr *cmsg;
+ char recv_fd[CMSG_SPACE(sizeof(int))];
+ struct msghdr msg = { 0 };
+ union {
+ unsigned char vc[4];
+ int vi;
+ } tmp;
+
+ /* Prepare to receive the structures */
+ iov[0].iov_base = &data_fd;
+ iov[0].iov_len = sizeof(data_fd);
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = recv_fd;
+ msg.msg_controllen = sizeof(recv_fd);
+
+ ret = recvmsg(sock, &msg, 0);
+ if (ret < 0) {
+ perror("recvmsg fds");
+ goto end;
+ }
+
+ if (ret != sizeof(data_fd)) {
+ fprintf(stderr, "Error: Received %d bytes, expected %ld",
+ ret, sizeof(data_fd));
+ goto end;
+ }
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg) {
+ fprintf(stderr, "Error: Invalid control message header");
+ ret = -1;
+ goto end;
+ }
+
+ if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
+ fprintf(stderr, "Didn't received any fd");
+ ret = -1;
+ goto end;
+ }
+
+ /* this is our fd */
+ for (i = 0; i < sizeof(int); i++) {
+ tmp.vc[i] = CMSG_DATA(cmsg)[i];
+ }
+
+ ret = tmp.vi;
+
+end:
+ return ret;
+}