2 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
11 #include <common/macros.hpp>
12 #include <common/make-unique-wrapper.hpp>
15 #include <sys/types.h>
17 enum lttng_pipe_state {
18 LTTNG_PIPE_STATE_OPENED = 1,
19 LTTNG_PIPE_STATE_CLOSED = 2,
22 /* Close both side of pipe. */
23 int lttng_pipe_close(struct lttng_pipe *pipe);
26 static void _lttng_pipe_close_wrapper(lttng_pipe *pipe)
28 lttng_pipe_close(pipe);
31 using uptr = std::unique_ptr<
33 lttng::details::create_unique_class<lttng_pipe, _lttng_pipe_close_wrapper>::deleter>;
35 /* Read: 0, Write: 1. */
38 * Flags of the pipe once opened. pipe(2) specifies either O_NONBLOCK or
39 * O_CLOEXEC can be used. Flags are set using fcntl(2) call.
44 * These states are protected by the operation mutex below.
46 enum lttng_pipe_state r_state;
47 enum lttng_pipe_state w_state;
49 /* Held for each read(2) operation. */
50 pthread_mutex_t read_mutex;
51 /* Held for each write(2) operation. */
52 pthread_mutex_t write_mutex;
56 * Return 1 if read side is open else 0.
58 static inline int lttng_pipe_is_read_open(const struct lttng_pipe *pipe)
60 return pipe->r_state == LTTNG_PIPE_STATE_OPENED ? 1 : 0;
64 * Return 1 if write side is open else 0.
66 static inline int lttng_pipe_is_write_open(const struct lttng_pipe *pipe)
68 return pipe->w_state == LTTNG_PIPE_STATE_OPENED ? 1 : 0;
71 static inline int lttng_pipe_get_readfd(const struct lttng_pipe *pipe)
76 static inline int lttng_pipe_get_writefd(const struct lttng_pipe *pipe)
81 struct lttng_pipe *lttng_pipe_open(int flags);
82 struct lttng_pipe *lttng_pipe_named_open(const char *path, mode_t mode,
84 int lttng_pipe_write_close(struct lttng_pipe *pipe);
85 int lttng_pipe_read_close(struct lttng_pipe *pipe);
86 void lttng_pipe_destroy(struct lttng_pipe *pipe);
88 ssize_t lttng_pipe_read(struct lttng_pipe *pipe, void *buf, size_t count);
89 ssize_t lttng_pipe_write(struct lttng_pipe *pipe, const void *buf,
91 /* Returns and releases the read end of the pipe. */
92 int lttng_pipe_release_readfd(struct lttng_pipe *pipe);
93 /* Returns and releases the write end of the pipe. */
94 int lttng_pipe_release_writefd(struct lttng_pipe *pipe);
96 #endif /* LTTNG_PIPE_H */