| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; only version 2 |
| 7 | * of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <config.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <lttngerr.h> |
| 22 | #include "ust-comm.h" |
| 23 | |
| 24 | /* |
| 25 | * Send msg containing a command to an UST application via sock and wait for |
| 26 | * the reply. Caller must free() the reply structure sent back. |
| 27 | * |
| 28 | * Return the replied structure or NULL. |
| 29 | */ |
| 30 | struct lttcomm_ust_reply *ustcomm_send_command(int sock, |
| 31 | struct lttcomm_ust_msg *msg) |
| 32 | { |
| 33 | ssize_t len; |
| 34 | struct lttcomm_ust_reply *reply; |
| 35 | |
| 36 | /* Extra safety */ |
| 37 | if (msg == NULL || sock < 0) { |
| 38 | goto error; |
| 39 | } |
| 40 | |
| 41 | DBG2("Sending UST command %d to sock %d", msg->cmd, sock); |
| 42 | |
| 43 | /* Send UST msg */ |
| 44 | len = lttcomm_send_unix_sock(sock, msg, sizeof(*msg)); |
| 45 | if (len < 0) { |
| 46 | goto error; |
| 47 | } |
| 48 | |
| 49 | reply = malloc(sizeof(struct lttcomm_ust_reply)); |
| 50 | if (reply == NULL) { |
| 51 | perror("malloc ust reply"); |
| 52 | goto error; |
| 53 | } |
| 54 | |
| 55 | DBG2("Receiving UST reply on sock %d", sock); |
| 56 | |
| 57 | /* Get UST reply */ |
| 58 | len = lttcomm_recv_unix_sock(sock, reply, sizeof(*reply)); |
| 59 | if (len < 0 || len < sizeof(*reply)) { |
| 60 | goto error; |
| 61 | } |
| 62 | |
| 63 | return reply; |
| 64 | |
| 65 | error: |
| 66 | return NULL; |
| 67 | } |