2 * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License, version 2.1 only,
6 * as published by the Free Software Foundation.
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "readwrite.h"
27 * lttng_read and lttng_write take care of EINTR and partial read/write.
28 * Upon success, they return the "count" received as parameter.
29 * They can return a negative value if an error occurs.
30 * If a value lower than the requested "count" is returned, it means an
32 * The error can be checked by querying errno.
35 ssize_t
lttng_read(int fd
, void *buf
, size_t count
)
43 * Deny a read count that can be bigger then the returned value max size.
44 * This makes the function to never return an overflow value.
46 if (count
> SSIZE_MAX
) {
51 ret
= read(fd
, buf
+ i
, count
- i
);
54 continue; /* retry operation */
61 } while (count
- i
> 0 && ret
> 0);
73 ssize_t
lttng_write(int fd
, const void *buf
, size_t count
)
81 * Deny a write count that can be bigger then the returned value max size.
82 * This makes the function to never return an overflow value.
84 if (count
> SSIZE_MAX
) {
89 ret
= write(fd
, buf
+ i
, count
- i
);
92 continue; /* retry operation */
99 } while (count
- i
> 0 && ret
> 0);
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