Don't report back error on syscalls fail for -a -k

[lttng-tools.git] / src / common / sessiond-comm / sessiond-comm.c

diff --git a/src/common/sessiond-comm/sessiond-comm.c b/src/common/sessiond-comm/sessiond-comm.c
index aa24e82ddff31d80f6d0d15fe969aca8dc80f49e..11319f333e84f34d30a75132d981444d136f7e24 100644 (file)
--- a/src/common/sessiond-comm/sessiond-comm.c
+++ b/src/common/sessiond-comm/sessiond-comm.c
@@ -2,18 +2,18 @@
  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; only version 2 of the License.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2 only,
+ * as published by the Free Software Foundation.
  * 
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  * 
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA  02111-1307, USA.
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _GNU_SOURCE
@@ -60,6 +60,7 @@ static const char *lttcomm_readable_code[] = {
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible",
        [ 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_CHAN_EXIST) ] = "Kernel channel already exists",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
@@ -101,6 +102,11 @@ static const char *lttcomm_readable_code[] = {
        [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "Tracing the kernel requires a root lttng-sessiond daemon and \"tracing\" group user membership",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STARTED) ] = "Tracing already started",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STOPPED) ] = "Tracing already stopped",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_ENOSYS) ] = "Kernel event type not supported",
+
        [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready",
        [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds",
        [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds",
@@ -116,6 +122,7 @@ static const char *lttcomm_readable_code[] = {
        [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM",
        [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE",
        [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found",
+       [ LTTCOMM_ERR_INDEX(LTTCOMM_INVALID) ] = "Invalid parameter",
 };
 
 /*
@@ -263,7 +270,9 @@ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
        msg.msg_iov = iov;
        msg.msg_iovlen = 1;
 
-       ret = recvmsg(sock, &msg, MSG_WAITALL);
+       do {
+               ret = recvmsg(sock, &msg, MSG_WAITALL);
+       } while (ret < 0 && errno == EINTR);
        if (ret < 0) {
                PERROR("recvmsg");
        }
@@ -291,7 +300,13 @@ ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
 
        ret = sendmsg(sock, &msg, 0);
        if (ret < 0) {
-               PERROR("sendmsg");
+               /*
+                * Only warn about EPIPE when quiet mode is deactivated.
+                * We consider EPIPE as expected.
+                */
+               if (errno != EPIPE || !lttng_opt_quiet) {
+                       PERROR("sendmsg");
+               }
        }
 
        return ret;
@@ -354,9 +369,17 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
        msg.msg_iov = iov;
        msg.msg_iovlen = 1;
 
-       ret = sendmsg(sock, &msg, 0);
+       do {
+               ret = sendmsg(sock, &msg, 0);
+       } while (ret < 0 && errno == EINTR);
        if (ret < 0) {
-               PERROR("sendmsg");
+               /*
+                * Only warn about EPIPE when quiet mode is deactivated.
+                * We consider EPIPE as expected.
+                */
+               if (errno != EPIPE || !lttng_opt_quiet) {
+                       PERROR("sendmsg");
+               }
        }
        return ret;
 }
@@ -389,7 +412,9 @@ ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
        msg.msg_control = recv_fd;
        msg.msg_controllen = sizeof(recv_fd);
 
-       ret = recvmsg(sock, &msg, 0);
+       do {
+               ret = recvmsg(sock, &msg, 0);
+       } while (ret < 0 && errno == EINTR);
        if (ret < 0) {
                PERROR("recvmsg fds");
                goto end;
@@ -467,11 +492,18 @@ ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
        LTTNG_SOCK_SET_PID_CRED(creds, getpid());
 #endif /* __linux__ */
 
-       ret = sendmsg(sock, &msg, 0);
+       do {
+               ret = sendmsg(sock, &msg, 0);
+       } while (ret < 0 && errno == EINTR);
        if (ret < 0) {
-               PERROR("sendmsg");
+               /*
+                * Only warn about EPIPE when quiet mode is deactivated.
+                * We consider EPIPE as expected.
+                */
+               if (errno != EPIPE || !lttng_opt_quiet) {
+                       PERROR("sendmsg");
+               }
        }
-
        return ret;
 }
 
@@ -511,7 +543,9 @@ ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
        msg.msg_controllen = sizeof(anc_buf);
 #endif /* __linux__ */
 
-       ret = recvmsg(sock, &msg, 0);
+       do {
+               ret = recvmsg(sock, &msg, 0);
+       } while (ret < 0 && errno == EINTR);
        if (ret < 0) {
                PERROR("recvmsg fds");
                goto end;