relayd: replace uses of block FDs by the fs_handle interface

[lttng-tools.git] / src / common / fs-handle.c

/*
 * Copyright (C) 2020 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation; version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <common/fs-handle-internal.h>
#include <common/fs-handle.h>
#include <common/readwrite.h>

LTTNG_HIDDEN
int fs_handle_get_fd(struct fs_handle *handle)
{
	return handle->get_fd(handle);
}

LTTNG_HIDDEN
void fs_handle_put_fd(struct fs_handle *handle)
{
	return handle->put_fd(handle);
}

LTTNG_HIDDEN
int fs_handle_unlink(struct fs_handle *handle)
{
	return handle->unlink(handle);
}

LTTNG_HIDDEN
int fs_handle_close(struct fs_handle *handle)
{
	return handle->close(handle);
}

LTTNG_HIDDEN
ssize_t fs_handle_read(struct fs_handle *handle, void *buf, size_t count)
{
	ssize_t ret;
	const int fd = fs_handle_get_fd(handle);

	if (fd < 0) {
		ret = -1;
		goto end;
	}

	ret = lttng_read(fd, buf, count);
	fs_handle_put_fd(handle);
end:
	return ret;
}

LTTNG_HIDDEN
ssize_t fs_handle_write(struct fs_handle *handle, const void *buf, size_t count)
{
	ssize_t ret;
	const int fd = fs_handle_get_fd(handle);

	if (fd < 0) {
		ret = -1;
		goto end;
	}

	ret = lttng_write(fd, buf, count);
	fs_handle_put_fd(handle);
end:
	return ret;
}

LTTNG_HIDDEN
int fs_handle_truncate(struct fs_handle *handle, off_t offset)
{
        int ret;
	const int fd = fs_handle_get_fd(handle);

	if (fd < 0) {
		ret = -1;
		goto end;
	}

	ret = ftruncate(fd, offset);
	fs_handle_put_fd(handle);
end:
	return ret;
}

LTTNG_HIDDEN
int fs_handle_seek(struct fs_handle *handle, off_t offset, int whence)
{
        int ret;
	const int fd = fs_handle_get_fd(handle);

	if (fd < 0) {
		ret = -1;
		goto end;
	}

	ret = lseek(fd, offset, whence);
	fs_handle_put_fd(handle);
end:
	return ret;
}