X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fpipe.c;fp=src%2Fcommon%2Fpipe.c;h=0000000000000000000000000000000000000000;hp=45be43fa3833fe21966b8377a9831e6c185b7540;hb=a6bc4ca9d659caf016ef932fcd944029737ac57c;hpb=97535efaa975ca52bf02c2d5e76351bfd2e3defa

diff --git a/src/common/pipe.c b/src/common/pipe.c
deleted file mode 100644
index 45be43fa3..000000000
--- a/src/common/pipe.c
+++ /dev/null
@@ -1,468 +0,0 @@
-/*
- * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include <common/common.h>
-
-#include "pipe.h"
-
-/*
- * Lock read side of a pipe.
- */
-static void lock_read_side(struct lttng_pipe *pipe)
-{
-	pthread_mutex_lock(&pipe->read_mutex);
-}
-
-/*
- * Unlock read side of a pipe.
- */
-static void unlock_read_side(struct lttng_pipe *pipe)
-{
-	pthread_mutex_unlock(&pipe->read_mutex);
-}
-
-/*
- * Lock write side of a pipe.
- */
-static void lock_write_side(struct lttng_pipe *pipe)
-{
-	pthread_mutex_lock(&pipe->write_mutex);
-}
-
-/*
- * Unlock write side of a pipe.
- */
-static void unlock_write_side(struct lttng_pipe *pipe)
-{
-	pthread_mutex_unlock(&pipe->write_mutex);
-}
-
-/*
- * Internal function. Close read side of pipe WITHOUT locking the mutex.
- *
- * Return 0 on success else a negative errno from close(2).
- */
-static int _pipe_read_close(struct lttng_pipe *pipe)
-{
-	int ret, ret_val = 0;
-
-	LTTNG_ASSERT(pipe);
-
-	if (!lttng_pipe_is_read_open(pipe)) {
-		goto end;
-	}
-
-	do {
-		ret = close(pipe->fd[0]);
-	} while (ret < 0 && errno == EINTR);
-	if (ret < 0) {
-		PERROR("close lttng read pipe");
-		ret_val = -errno;
-	}
-	pipe->r_state = LTTNG_PIPE_STATE_CLOSED;
-
-end:
-	return ret_val;
-}
-
-/*
- * Internal function. Close write side of pipe WITHOUT locking the mutex.
- *
- * Return 0 on success else a negative errno from close(2).
- */
-static int _pipe_write_close(struct lttng_pipe *pipe)
-{
-	int ret, ret_val = 0;
-
-	LTTNG_ASSERT(pipe);
-
-	if (!lttng_pipe_is_write_open(pipe)) {
-		goto end;
-	}
-
-	do {
-		ret = close(pipe->fd[1]);
-	} while (ret < 0 && errno == EINTR);
-	if (ret < 0) {
-		PERROR("close lttng write pipe");
-		ret_val = -errno;
-	}
-	pipe->w_state = LTTNG_PIPE_STATE_CLOSED;
-
-end:
-	return ret_val;
-}
-
-static struct lttng_pipe *_pipe_create(void)
-{
-	int ret;
-	struct lttng_pipe *p;
-
-	p = zmalloc(sizeof(*p));
-	if (!p) {
-		PERROR("zmalloc pipe create");
-		goto end;
-	}
-	p->fd[0] = p->fd[1] = -1;
-
-	ret = pthread_mutex_init(&p->read_mutex, NULL);
-	if (ret) {
-		PERROR("pthread_mutex_init read lock pipe create");
-		goto error_destroy;
-	}
-	ret = pthread_mutex_init(&p->write_mutex, NULL);
-	if (ret) {
-		PERROR("pthread_mutex_init write lock pipe create");
-		goto error_destroy_rmutex;
-	}
-end:
-	return p;
-error_destroy_rmutex:
-	(void) pthread_mutex_destroy(&p->read_mutex);
-error_destroy:
-	free(p);
-	return NULL;
-}
-
-static int _pipe_set_flags(struct lttng_pipe *pipe, int flags)
-{
-	int i, ret = 0;
-
-	if (!flags) {
-		goto end;
-	}
-
-	for (i = 0; i < 2; i++) {
-		if (flags & O_NONBLOCK) {
-			ret = fcntl(pipe->fd[i], F_SETFL, O_NONBLOCK);
-			if (ret < 0) {
-				PERROR("fcntl lttng pipe %d", flags);
-				goto end;
-			}
-		}
-		if (flags & FD_CLOEXEC) {
-			ret = fcntl(pipe->fd[i], F_SETFD, FD_CLOEXEC);
-			if (ret < 0) {
-				PERROR("fcntl lttng pipe %d", flags);
-				goto end;
-			}
-		}
-		/*
-		 * We only check for O_NONBLOCK or FD_CLOEXEC, if another flag is
-		 * needed, we can add it, but for now just make sure we don't make
-		 * mistakes with the parameters we pass.
-		 */
-		if (!(flags & O_NONBLOCK) && !(flags & FD_CLOEXEC)) {
-			fprintf(stderr, "Unsupported flag\n");
-			ret = -1;
-			goto end;
-		}
-	}
-end:
-	return ret;
-}
-
-/*
- * Open a new lttng pipe and set flags using fcntl().
- *
- * Return a newly allocated lttng pipe on success or else NULL.
- */
-struct lttng_pipe *lttng_pipe_open(int flags)
-{
-	int ret;
-	struct lttng_pipe *p;
-
-	p = _pipe_create();
-	if (!p) {
-		goto error;
-	}
-
-	ret = pipe(p->fd);
-	if (ret < 0) {
-		PERROR("lttng pipe");
-		goto error;
-	}
-	p->r_state = LTTNG_PIPE_STATE_OPENED;
-	p->w_state = LTTNG_PIPE_STATE_OPENED;
-
-	ret = _pipe_set_flags(p, flags);
-	if (ret) {
-		goto error;
-	}
-
-	p->flags = flags;
-
-	return p;
-error:
-	lttng_pipe_destroy(p);
-	return NULL;
-}
-
-/*
- * Open a new lttng pipe at path and set flags using fcntl().
- *
- * Return a newly allocated lttng pipe on success or else NULL.
- */
-struct lttng_pipe *lttng_pipe_named_open(const char *path, mode_t mode,
-		int flags)
-{
-	int ret, fd_r, fd_w;
-	struct lttng_pipe *pipe;
-
-	pipe = _pipe_create();
-	if (!pipe) {
-		goto error;
-	}
-
-	ret = mkfifo(path, mode);
-	if (ret) {
-		PERROR("mkfifo");
-		goto error;
-	}
-
-	fd_r = open(path, O_RDONLY | O_NONBLOCK);
-	if (fd_r < 0) {
-		PERROR("open fifo");
-		goto error;
-	}
-	pipe->fd[0] = fd_r;
-	pipe->r_state = LTTNG_PIPE_STATE_OPENED;
-
-	fd_w = open(path, O_WRONLY | O_NONBLOCK);
-	if (fd_w < 0) {
-		PERROR("open fifo");
-		goto error;
-	}
-	pipe->fd[1] = fd_w;
-	pipe->w_state = LTTNG_PIPE_STATE_OPENED;
-
-	ret = _pipe_set_flags(pipe, flags);
-	if (ret) {
-		goto error;
-	}
-	pipe->flags = flags;
-
-	return pipe;
-error:
-	lttng_pipe_destroy(pipe);
-	return NULL;
-}
-
-/*
- * Close read side of a lttng pipe.
- *
- * Return 0 on success else a negative value.
- */
-int lttng_pipe_read_close(struct lttng_pipe *pipe)
-{
-	int ret;
-
-	LTTNG_ASSERT(pipe);
-
-	/* Handle read side first. */
-	lock_read_side(pipe);
-	ret = _pipe_read_close(pipe);
-	unlock_read_side(pipe);
-
-	return ret;
-}
-
-/*
- * Close write side of a lttng pipe.
- *
- * Return 0 on success else a negative value.
- */
-int lttng_pipe_write_close(struct lttng_pipe *pipe)
-{
-	int ret;
-
-	LTTNG_ASSERT(pipe);
-
-	lock_write_side(pipe);
-	ret = _pipe_write_close(pipe);
-	unlock_write_side(pipe);
-
-	return ret;
-}
-
-/*
- * Close both read and write side of a lttng pipe.
- *
- * Return 0 on success else a negative value.
- */
-int lttng_pipe_close(struct lttng_pipe *pipe)
-{
-	int ret, ret_val = 0;
-
-	LTTNG_ASSERT(pipe);
-
-	ret = lttng_pipe_read_close(pipe);
-	if (ret < 0) {
-		ret_val = ret;
-	}
-
-	ret = lttng_pipe_write_close(pipe);
-	if (ret < 0) {
-		ret_val = ret;
-	}
-
-	return ret_val;
-}
-
-/*
- * Close and destroy a lttng pipe object. Finally, pipe is freed.
- */
-void lttng_pipe_destroy(struct lttng_pipe *pipe)
-{
-	int ret;
-
-	if (!pipe) {
-		return;
-	}
-
-	/*
-	 * Destroy should *never* be called with a locked mutex. These must always
-	 * succeed so we unlock them after the close pipe below.
-	 */
-	ret = pthread_mutex_trylock(&pipe->read_mutex);
-	LTTNG_ASSERT(!ret);
-	ret = pthread_mutex_trylock(&pipe->write_mutex);
-	LTTNG_ASSERT(!ret);
-
-	/* Close pipes WITHOUT trying to lock the pipes. */
-	(void) _pipe_read_close(pipe);
-	(void) _pipe_write_close(pipe);
-
-	unlock_read_side(pipe);
-	unlock_write_side(pipe);
-
-	(void) pthread_mutex_destroy(&pipe->read_mutex);
-	(void) pthread_mutex_destroy(&pipe->write_mutex);
-
-	free(pipe);
-}
-
-/*
- * Read on a lttng pipe and put the data in buf of at least size count.
- *
- * Return "count" on success. Return < count on error. errno can be used
- * to check the actual error.
- */
-ssize_t lttng_pipe_read(struct lttng_pipe *pipe, void *buf, size_t count)
-{
-	ssize_t ret;
-
-	LTTNG_ASSERT(pipe);
-	LTTNG_ASSERT(buf);
-
-	lock_read_side(pipe);
-	if (!lttng_pipe_is_read_open(pipe)) {
-		ret = -1;
-		errno = EBADF;
-		goto error;
-	}
-	ret = lttng_read(pipe->fd[0], buf, count);
-error:
-	unlock_read_side(pipe);
-	return ret;
-}
-
-/*
- * Write on a lttng pipe using the data in buf and size of count.
- *
- * Return "count" on success. Return < count on error. errno can be used
- * to check the actual error.
- */
-ssize_t lttng_pipe_write(struct lttng_pipe *pipe, const void *buf,
-		size_t count)
-{
-	ssize_t ret;
-
-	LTTNG_ASSERT(pipe);
-	LTTNG_ASSERT(buf);
-
-	lock_write_side(pipe);
-	if (!lttng_pipe_is_write_open(pipe)) {
-		ret = -1;
-		errno = EBADF;
-		goto error;
-	}
-	ret = lttng_write(pipe->fd[1], buf, count);
-error:
-	unlock_write_side(pipe);
-	return ret;
-}
-
-/*
- * Return and release the read end of the pipe.
- *
- * This call transfers the ownership of the read fd of the underlying pipe
- * to the caller if it is still open.
- *
- * Returns the fd of the read end of the pipe, or -1 if it was already closed or
- * released.
- */
-int lttng_pipe_release_readfd(struct lttng_pipe *pipe)
-{
-	int ret;
-
-	if (!pipe) {
-		ret = -1;
-		goto end;
-	}
-
-	lock_read_side(pipe);
-	if (!lttng_pipe_is_read_open(pipe)) {
-		ret = -1;
-		goto end_unlock;
-	}
-	ret = pipe->fd[0];
-	pipe->fd[0] = -1;
-	pipe->r_state = LTTNG_PIPE_STATE_CLOSED;
-end_unlock:
-	unlock_read_side(pipe);
-end:
-	return ret;
-}
-
-/*
- * Return and release the write end of the pipe.
- *
- * This call transfers the ownership of the write fd of the underlying pipe
- * to the caller if it is still open.
- *
- * Returns the fd of the write end of the pipe, or -1 if it was alwritey closed
- * or released.
- */
-int lttng_pipe_release_writefd(struct lttng_pipe *pipe)
-{
-	int ret;
-
-	if (!pipe) {
-		ret = -1;
-		goto end;
-	}
-
-	lock_write_side(pipe);
-	if (!lttng_pipe_is_write_open(pipe)) {
-		ret = -1;
-		goto end_unlock;
-	}
-	ret = pipe->fd[1];
-	pipe->fd[1] = -1;
-	pipe->w_state = LTTNG_PIPE_STATE_CLOSED;
-end_unlock:
-	unlock_write_side(pipe);
-end:
-	return ret;
-}