Fix: check for kernel session metadata during init
[lttng-tools.git] / src / common / readwrite.h
1 #ifndef LTTNG_COMMON_READWRITE_H
2 #define LTTNG_COMMON_READWRITE_H
3
4 /*
5 * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 *
7 * This library is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License, version 2.1 only,
9 * as published by the Free Software Foundation.
10 *
11 * This library is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this library; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <unistd.h>
22
23 /*
24 * lttng_read and lttng_write take care of EINTR and partial read/write.
25 * Upon success, they return the "count" received as parameter.
26 * They can return a negative value if an error occurs.
27 * If a value lower than the requested "count" is returned, it means an
28 * error occured.
29 * The error can be checked by querying errno.
30 */
31 ssize_t lttng_read(int fd, void *buf, size_t count);
32 ssize_t lttng_write(int fd, const void *buf, size_t count);
33
34 #endif /* LTTNG_COMMON_READWRITE_H */
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