/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011 EfficiOS Inc.
+ * Copyright (C) 2011 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, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * 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.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _LGPL_SOURCE
* Receive data of size len in put that data into the buf param. Using recvmsg
* API. Only use with sockets set in non-blocking mode.
*
+ * NOTE: EPIPE errors are NOT reported. This call expects the socket to be in a
+ * poll set. The poll loop will handle the EPIPE original cause.
+ *
* Return the size of received data.
*/
LTTNG_HIDDEN
goto retry;
} else {
/*
- * Only warn about EPIPE when quiet mode is
- * deactivated.
- * We consider EPIPE as expected.
+ * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected.
*/
- if (errno != EPIPE || !lttng_opt_quiet) {
- PERROR("recvmsg");
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EPIPE) {
+ /*
+ * Nothing was recv.
+ */
+ ret = 0;
+ goto end;
}
+
+ /* Unexpected error */
+ PERROR("recvmsg");
+ ret = -1;
goto end;
}
}
- ret = len;
+
end:
return ret;
}
* of the function is that this one does not retry to send on partial sends,
* except if the interruption was caused by a signal (EINTR).
*
+ * NOTE: EPIPE errors are NOT reported. This call expects the socket to be in a
+ * poll set. The poll loop will handle the EPIPE original cause.
+ *
* Return the size of sent data.
*/
LTTNG_HIDDEN
goto retry;
} else {
/*
- * Only warn about EPIPE when quiet mode is
- * deactivated.
- * We consider EPIPE as expected.
+ * We consider EPIPE and EAGAIN/EWOULDBLOCK as expected.
*/
- if (errno != EPIPE || !lttng_opt_quiet) {
- PERROR("sendmsg");
+ if (errno == EAGAIN || errno == EWOULDBLOCK ||
+ errno == EPIPE) {
+ /*
+ * This can happen in non blocking mode.
+ * Nothing was sent.
+ */
+ ret = 0;
+ goto end;
}
+
+ /* Unexpected error */
+ PERROR("sendmsg");
+ ret = -1;
goto end;
}
}
- ret = len;
end:
return ret;
}