2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program 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 General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 enum lttng_pipe_state
{
24 LTTNG_PIPE_STATE_OPENED
= 1,
25 LTTNG_PIPE_STATE_CLOSED
= 2,
29 /* Read: 0, Write: 1. */
32 * Flags of the pipe once opened. pipe(2) specifies either O_NONBLOCK or
33 * O_CLOEXEC can be used. Flags are set using fcntl(2) call.
38 * These states are protected by the operation mutex below.
40 enum lttng_pipe_state r_state
;
41 enum lttng_pipe_state w_state
;
43 /* Held for each read(2) operation. */
44 pthread_mutex_t read_mutex
;
45 /* Held for each write(2) operation. */
46 pthread_mutex_t write_mutex
;
50 * Return 1 if read side is open else 0.
52 static inline int lttng_pipe_is_read_open(struct lttng_pipe
*pipe
)
54 return pipe
->r_state
== LTTNG_PIPE_STATE_OPENED
? 1 : 0;
58 * Return 1 if write side is open else 0.
60 static inline int lttng_pipe_is_write_open(struct lttng_pipe
*pipe
)
62 return pipe
->w_state
== LTTNG_PIPE_STATE_OPENED
? 1 : 0;
65 static inline int lttng_pipe_get_readfd(struct lttng_pipe
*pipe
)
70 static inline int lttng_pipe_get_writefd(struct lttng_pipe
*pipe
)
75 struct lttng_pipe
*lttng_pipe_open(int flags
);
76 int lttng_pipe_write_close(struct lttng_pipe
*pipe
);
77 int lttng_pipe_read_close(struct lttng_pipe
*pipe
);
78 /* Close both side of pipe. */
79 int lttng_pipe_close(struct lttng_pipe
*pipe
);
80 void lttng_pipe_destroy(struct lttng_pipe
*pipe
);
82 ssize_t
lttng_pipe_read(struct lttng_pipe
*pipe
, void *buf
, size_t count
);
83 ssize_t
lttng_pipe_write(struct lttng_pipe
*pipe
, const void *buf
,
86 #endif /* LTTNG_PIPE_H */