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);
24 void lttng_pipe_destroy(struct lttng_pipe *pipe);
27 using uptr = std::unique_ptr<
29 lttng::memory::create_deleter_class<lttng_pipe, lttng_pipe_destroy>::deleter>;
31 /* Read: 0, Write: 1. */
34 * Flags of the pipe once opened. pipe(2) specifies either O_NONBLOCK or
35 * O_CLOEXEC can be used. Flags are set using fcntl(2) call.
40 * These states are protected by the operation mutex below.
42 enum lttng_pipe_state r_state;
43 enum lttng_pipe_state w_state;
45 /* Held for each read(2) operation. */
46 pthread_mutex_t read_mutex;
47 /* Held for each write(2) operation. */
48 pthread_mutex_t write_mutex;
52 * Return 1 if read side is open else 0.
54 static inline int lttng_pipe_is_read_open(const struct lttng_pipe *pipe)
56 return pipe->r_state == LTTNG_PIPE_STATE_OPENED ? 1 : 0;
60 * Return 1 if write side is open else 0.
62 static inline int lttng_pipe_is_write_open(const struct lttng_pipe *pipe)
64 return pipe->w_state == LTTNG_PIPE_STATE_OPENED ? 1 : 0;
67 static inline int lttng_pipe_get_readfd(const struct lttng_pipe *pipe)
72 static inline int lttng_pipe_get_writefd(const struct lttng_pipe *pipe)
77 struct lttng_pipe *lttng_pipe_open(int flags);
78 struct lttng_pipe *lttng_pipe_named_open(const char *path, mode_t mode, int flags);
79 int lttng_pipe_write_close(struct lttng_pipe *pipe);
80 int lttng_pipe_read_close(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, size_t count);
84 /* Returns and releases the read end of the pipe. */
85 int lttng_pipe_release_readfd(struct lttng_pipe *pipe);
86 /* Returns and releases the write end of the pipe. */
87 int lttng_pipe_release_writefd(struct lttng_pipe *pipe);
89 #endif /* LTTNG_PIPE_H */