Initial work for kernel tracing support

[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.c

diff --git a/liblttsessiondcomm/liblttsessiondcomm.c b/liblttsessiondcomm/liblttsessiondcomm.c
index ddee7bcae512bc4a116506c3bc054a378117c0fc..d1e38898501c7ab74a60c36199a087e69c6466ee 100644 (file)
--- a/liblttsessiondcomm/liblttsessiondcomm.c
+++ b/liblttsessiondcomm/liblttsessiondcomm.c
@@ -54,6 +54,12 @@ static const char *lttcomm_readable_code[] = {
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
        [ 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",
@@ -271,3 +277,41 @@ int lttcomm_close_unix_sock(int sock)
 
        return ret;
 }
+
+/*
+ *  lttcomm_send_fds_unix_sock
+ *
+ *  Send multiple fds on a unix socket.
+ */
+ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len)
+{
+       struct msghdr msg;
+       struct cmsghdr *cmptr;
+       struct iovec iov[1];
+       ssize_t ret = -1;
+       unsigned int sizeof_fds = nb_fd * sizeof(int);
+       char tmp[CMSG_SPACE(sizeof_fds)];
+
+       memset(&msg, 0, sizeof(msg));
+
+       msg.msg_control = (caddr_t)tmp;
+       msg.msg_controllen = CMSG_LEN(sizeof_fds);
+
+       cmptr = CMSG_FIRSTHDR(&msg);
+       cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
+       cmptr->cmsg_level = SOL_SOCKET;
+       cmptr->cmsg_type = SCM_RIGHTS;
+       memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
+
+       iov[0].iov_base = buf;
+       iov[0].iov_len = len;
+       msg.msg_iov = iov;
+       msg.msg_iovlen = 1;
+
+       ret = sendmsg(sock, &msg, 0);
+       if (ret < 0) {
+               perror("sendmsg");
+       }
+
+       return ret;
+}