759 lines
18 KiB
C
759 lines
18 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2012-09-30 Bernard first version.
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* 2017-11-08 JasonJiaJie fix memory leak issue when close a pipe.
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*/
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#include <rthw.h>
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#include <rtdevice.h>
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#include <stdint.h>
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#include <sys/errno.h>
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#if defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_POSIX_PIPE)
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#include <unistd.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <sys/ioctl.h>
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#include <dfs_file.h>
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/**
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* @brief This function will open a pipe.
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*
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* @param fd is the file descriptor.
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*
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* @return Return the operation status.
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* When the return value is 0, it means the operation is successful.
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* When the return value is -1, it means the file descriptor is invalid.
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* When the return value is -RT_ENOMEM, it means insufficient memory allocation failed.
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*/
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static int pipe_fops_open(struct dfs_fd *fd)
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{
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int rc = 0;
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rt_device_t device;
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rt_pipe_t *pipe;
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pipe = (rt_pipe_t *)fd->data;
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if (!pipe) return -1;
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device = &(pipe->parent);
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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if (device->ref_count == 0)
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{
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pipe->fifo = rt_ringbuffer_create(pipe->bufsz);
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if (pipe->fifo == RT_NULL)
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{
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rc = -RT_ENOMEM;
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goto __exit;
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}
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}
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switch (fd->flags & O_ACCMODE)
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{
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case O_RDONLY:
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pipe->readers ++;
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break;
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case O_WRONLY:
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pipe->writers ++;
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break;
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case O_RDWR:
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pipe->readers ++;
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pipe->writers ++;
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break;
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}
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device->ref_count ++;
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__exit:
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rt_mutex_release(&(pipe->lock));
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return rc;
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}
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/**
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* @brief This function will close a pipe.
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*
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* @param fd is the file descriptor.
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*
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* @return Return the operation status.
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* When the return value is 0, it means the operation is successful.
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* When the return value is -1, it means the file descriptor is invalid.
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*/
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static int pipe_fops_close(struct dfs_fd *fd)
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{
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rt_device_t device;
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rt_pipe_t *pipe;
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pipe = (rt_pipe_t *)fd->data;
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if (!pipe) return -1;
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device = &(pipe->parent);
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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switch (fd->flags & O_ACCMODE)
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{
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case O_RDONLY:
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pipe->readers --;
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break;
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case O_WRONLY:
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pipe->writers --;
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break;
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case O_RDWR:
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pipe->readers --;
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pipe->writers --;
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break;
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}
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if (pipe->writers == 0)
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{
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rt_wqueue_wakeup(&(pipe->reader_queue), (void*)(POLLIN | POLLERR | POLLHUP));
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}
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if (pipe->readers == 0)
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{
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rt_wqueue_wakeup(&(pipe->writer_queue), (void*)(POLLOUT | POLLERR | POLLHUP));
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}
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if (device->ref_count == 1)
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{
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if (pipe->fifo != RT_NULL)
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rt_ringbuffer_destroy(pipe->fifo);
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pipe->fifo = RT_NULL;
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}
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device->ref_count --;
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rt_mutex_release(&(pipe->lock));
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if (device->ref_count == 0 && pipe->is_named == RT_FALSE)
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{
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/* delete the unamed pipe */
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rt_pipe_delete(device->parent.name);
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}
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return 0;
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}
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/**
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* @brief This function will get the pipe space size depends on the command.
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*
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* @param fd is the file descriptor.
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*
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* @param cmd is the command. It determines what data will get.
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*
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* FIONREAD The command to get the number of bytes in the pipe.
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*
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* FIONWRITE The command to get the number of bytes can be written to the pipe.
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*
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* @param args is the pointer to the data to store the read data.
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*
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* @return Return the operation status.
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* When the return value is 0, it means the operation is successful.
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* When the return value is -EINVAL, it means the command is invalid.
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*/
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static int pipe_fops_ioctl(struct dfs_fd *fd, int cmd, void *args)
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{
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rt_pipe_t *pipe;
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int ret = 0;
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pipe = (rt_pipe_t *)fd->data;
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switch (cmd)
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{
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case FIONREAD:
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*((int*)args) = rt_ringbuffer_data_len(pipe->fifo);
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break;
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case FIONWRITE:
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*((int*)args) = rt_ringbuffer_space_len(pipe->fifo);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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/**
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* @brief This function will read data from pipe.
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*
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* @param fd is the file descriptor.
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*
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* @param buf is the buffer to store the read data.
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*
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* @param count is the length of data to be read.
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*
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* @return Return the length of data read.
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* When the return value is 0, it means O_NONBLOCK is enabled and there is no thread that has the pipe open for writing.
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* When the return value is -EAGAIN, it means there are no data to be read.
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*/
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static int pipe_fops_read(struct dfs_fd *fd, void *buf, size_t count)
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{
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int len = 0;
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rt_pipe_t *pipe;
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pipe = (rt_pipe_t *)fd->data;
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/* no process has the pipe open for writing, return end-of-file */
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if (pipe->writers == 0)
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return 0;
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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while (1)
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{
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if (pipe->writers == 0)
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{
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goto out;
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}
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len = rt_ringbuffer_get(pipe->fifo, buf, count);
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if (len > 0)
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{
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break;
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}
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else
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{
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if (fd->flags & O_NONBLOCK)
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{
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len = -EAGAIN;
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goto out;
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}
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rt_mutex_release(&pipe->lock);
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rt_wqueue_wakeup(&(pipe->writer_queue), (void*)POLLOUT);
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rt_wqueue_wait(&(pipe->reader_queue), 0, -1);
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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}
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}
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/* wakeup writer */
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rt_wqueue_wakeup(&(pipe->writer_queue), (void*)POLLOUT);
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out:
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rt_mutex_release(&pipe->lock);
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return len;
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}
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/**
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* @brief This function will write data to pipe.
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*
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* @param fd is the file descriptor.
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*
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* @param buf is a pointer to the data buffer to be written.
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*
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* @param count is the length of data to be write.
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*
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* @return Return the length of data written.
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* When the return value is -EAGAIN, it means O_NONBLOCK is enabled and there are no space to be written.
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* When the return value is -EPIPE, it means there is no thread that has the pipe open for reading.
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*/
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static int pipe_fops_write(struct dfs_fd *fd, const void *buf, size_t count)
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{
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int len;
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rt_pipe_t *pipe;
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int wakeup = 0;
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int ret = 0;
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uint8_t *pbuf;
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pipe = (rt_pipe_t *)fd->data;
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if (pipe->readers == 0)
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{
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ret = -EPIPE;
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goto out;
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}
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if (count == 0)
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return 0;
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pbuf = (uint8_t*)buf;
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rt_mutex_take(&pipe->lock, -1);
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while (1)
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{
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if (pipe->readers == 0)
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{
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if (ret == 0)
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ret = -EPIPE;
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break;
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}
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len = rt_ringbuffer_put(pipe->fifo, pbuf, count - ret);
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ret += len;
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pbuf += len;
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wakeup = 1;
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if (ret == count)
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{
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break;
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}
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else
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{
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if (fd->flags & O_NONBLOCK)
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{
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if (ret == 0)
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{
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ret = -EAGAIN;
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}
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break;
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}
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}
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rt_mutex_release(&pipe->lock);
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rt_wqueue_wakeup(&(pipe->reader_queue), (void*)POLLIN);
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/* pipe full, waiting on suspended write list */
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rt_wqueue_wait(&(pipe->writer_queue), 0, -1);
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rt_mutex_take(&pipe->lock, -1);
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}
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rt_mutex_release(&pipe->lock);
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if (wakeup)
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{
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rt_wqueue_wakeup(&(pipe->reader_queue), (void*)POLLIN);
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}
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out:
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return ret;
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}
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/**
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* @brief This function will get the pipe status.
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*
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* @param fd is the file descriptor.
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*
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* @param req is the request type.
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*
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* @return mask of the pipe status.
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* POLLIN means there is data to be read.
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* POLLHUP means there is no thread that occupied the pipe to open for writing.
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* POLLOUT means there is space to be written.
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* POLLERR means there is no thread that occupied the pipe to open for reading.
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*/
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static int pipe_fops_poll(struct dfs_fd *fd, rt_pollreq_t *req)
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{
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int mask = 0;
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rt_pipe_t *pipe;
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int mode = 0;
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pipe = (rt_pipe_t *)fd->data;
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rt_poll_add(&(pipe->reader_queue), req);
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rt_poll_add(&(pipe->writer_queue), req);
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switch (fd->flags & O_ACCMODE)
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{
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case O_RDONLY:
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mode = 1;
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break;
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case O_WRONLY:
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mode = 2;
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break;
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case O_RDWR:
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mode = 3;
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break;
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}
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if (mode & 1)
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{
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if (rt_ringbuffer_data_len(pipe->fifo) != 0)
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{
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mask |= POLLIN;
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}
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if (pipe->writers == 0)
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{
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mask |= POLLHUP;
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}
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}
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if (mode & 2)
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{
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if (rt_ringbuffer_space_len(pipe->fifo) != 0)
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{
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mask |= POLLOUT;
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}
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if (pipe->readers == 0)
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{
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mask |= POLLERR;
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}
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}
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return mask;
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}
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static const struct dfs_file_ops pipe_fops =
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{
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pipe_fops_open,
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pipe_fops_close,
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pipe_fops_ioctl,
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pipe_fops_read,
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pipe_fops_write,
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RT_NULL,
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RT_NULL,
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RT_NULL,
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pipe_fops_poll,
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};
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#endif /* defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_POSIX_PIPE) */
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/**
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* @brief This function will open the pipe and actually creates the pipe buffer.
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*
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* @param device is a pointer to the pipe device descriptor.
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*
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* @param oflag is the open method, but it is not used yet.
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*
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* @return Return the operation status.
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* When the return value is RT_EOK, the operation is successful.
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* When the return value is -RT_EINVAL, it means the device handle is empty.
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* When the return value is -RT_ENOMEM, it means insufficient memory allocation failed.
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*/
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static rt_err_t rt_pipe_open(rt_device_t device, rt_uint16_t oflag)
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{
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rt_pipe_t *pipe = (rt_pipe_t *)device;
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rt_err_t ret = RT_EOK;
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if (device == RT_NULL)
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{
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ret = -RT_EINVAL;
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goto __exit;
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}
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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if (pipe->fifo == RT_NULL)
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{
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pipe->fifo = rt_ringbuffer_create(pipe->bufsz);
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if (pipe->fifo == RT_NULL)
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{
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ret = -RT_ENOMEM;
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}
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}
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rt_mutex_release(&(pipe->lock));
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__exit:
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return ret;
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}
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/**
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* @brief This function will close the pipe and release the pipe buffer.
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*
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* @param device is a pointer to the pipe device descriptor.
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*
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* @return Return the operation status.
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* When the return value is RT_EOK, the operation is successful.
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* When the return value is -RT_EINVAL, it means the device handle is empty.
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*/
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static rt_err_t rt_pipe_close(rt_device_t device)
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{
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rt_pipe_t *pipe = (rt_pipe_t *)device;
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if (device == RT_NULL) return -RT_EINVAL;
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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if (device->ref_count == 1)
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{
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rt_ringbuffer_destroy(pipe->fifo);
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pipe->fifo = RT_NULL;
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}
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rt_mutex_release(&(pipe->lock));
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return RT_EOK;
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}
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/**
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* @brief This function will read the specified length of data from the pipe.
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*
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* @param device is a pointer to the pipe device descriptor.
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*
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* @param pos is a parameter compatible with POSIX standard interface (currently meaningless, just pass in 0).
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*
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* @param buffer is a pointer to the buffer to store the read data.
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*
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* @param count is the length of data to be read.
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*
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* @return Return the length of data read.
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* When the return value is 0, it means the pipe device handle is empty or the count is 0.
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*/
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static rt_size_t rt_pipe_read(rt_device_t device, rt_off_t pos, void *buffer, rt_size_t count)
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{
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uint8_t *pbuf;
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rt_size_t read_bytes = 0;
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rt_pipe_t *pipe = (rt_pipe_t *)device;
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if (device == RT_NULL)
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{
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rt_set_errno(EINVAL);
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return 0;
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}
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if (count == 0) return 0;
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pbuf = (uint8_t*)buffer;
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rt_mutex_take(&(pipe->lock), RT_WAITING_FOREVER);
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while (read_bytes < count)
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{
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int len = rt_ringbuffer_get(pipe->fifo, &pbuf[read_bytes], count - read_bytes);
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if (len <= 0) break;
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read_bytes += len;
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}
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rt_mutex_release(&pipe->lock);
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return read_bytes;
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}
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/**
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* @brief This function will write the specified length of data to the pipe.
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*
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* @param device is a pointer to the pipe device descriptor.
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*
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* @param pos is a parameter compatible with POSIX standard interface (currently meaningless, just pass in 0).
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*
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* @param buffer is a pointer to the data buffer to be written.
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*
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* @param count is the length of data to be written.
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*
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* @return Return the length of data written.
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* When the return value is 0, it means the pipe device handle is empty or the count is 0.
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*/
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static rt_size_t rt_pipe_write(rt_device_t device, rt_off_t pos, const void *buffer, rt_size_t count)
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{
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uint8_t *pbuf;
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rt_size_t write_bytes = 0;
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rt_pipe_t *pipe = (rt_pipe_t *)device;
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if (device == RT_NULL)
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{
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rt_set_errno(EINVAL);
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return 0;
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}
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if (count == 0) return 0;
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pbuf = (uint8_t*)buffer;
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rt_mutex_take(&pipe->lock, -1);
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while (write_bytes < count)
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{
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int len = rt_ringbuffer_put(pipe->fifo, &pbuf[write_bytes], count - write_bytes);
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if (len <= 0) break;
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write_bytes += len;
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}
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rt_mutex_release(&pipe->lock);
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return write_bytes;
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}
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/**
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* @brief This function is not used yet.
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*
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* @param dev is not used yet.
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*
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* @param cmd is not used yet.
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*
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* @param args is not used yet.
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*
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* @return Always return RT_EOK.
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*/
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static rt_err_t rt_pipe_control(rt_device_t dev, int cmd, void *args)
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{
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return RT_EOK;
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}
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#ifdef RT_USING_DEVICE_OPS
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const static struct rt_device_ops pipe_ops =
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{
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RT_NULL,
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rt_pipe_open,
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rt_pipe_close,
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rt_pipe_read,
|
|
rt_pipe_write,
|
|
rt_pipe_control,
|
|
};
|
|
#endif /* RT_USING_DEVICE_OPS */
|
|
|
|
/**
|
|
* @brief This function will initialize a pipe device.
|
|
* The system allocates a pipe handle from dynamic heap memory, initializes the pipe handle
|
|
* with the specified value, and registers the pipe device with the system.
|
|
*
|
|
* @param name is the name of pipe device.
|
|
*
|
|
* @param bufsz is the size of pipe buffer.
|
|
*
|
|
* @return Return the pointer to the pipe device.
|
|
* When the return value is RT_NULL, it means the initialization failed.
|
|
*/
|
|
rt_pipe_t *rt_pipe_create(const char *name, int bufsz)
|
|
{
|
|
rt_pipe_t *pipe;
|
|
rt_device_t dev;
|
|
|
|
pipe = (rt_pipe_t *)rt_malloc(sizeof(rt_pipe_t));
|
|
if (pipe == RT_NULL) return RT_NULL;
|
|
|
|
rt_memset(pipe, 0, sizeof(rt_pipe_t));
|
|
pipe->is_named = RT_TRUE; /* initialize as a named pipe */
|
|
rt_mutex_init(&(pipe->lock), name, RT_IPC_FLAG_PRIO);
|
|
rt_wqueue_init(&(pipe->reader_queue));
|
|
rt_wqueue_init(&(pipe->writer_queue));
|
|
|
|
RT_ASSERT(bufsz < 0xFFFF);
|
|
pipe->bufsz = bufsz;
|
|
|
|
dev = &(pipe->parent);
|
|
dev->type = RT_Device_Class_Pipe;
|
|
#ifdef RT_USING_DEVICE_OPS
|
|
dev->ops = &pipe_ops;
|
|
#else
|
|
dev->init = RT_NULL;
|
|
dev->open = rt_pipe_open;
|
|
dev->read = rt_pipe_read;
|
|
dev->write = rt_pipe_write;
|
|
dev->close = rt_pipe_close;
|
|
dev->control = rt_pipe_control;
|
|
#endif
|
|
|
|
dev->rx_indicate = RT_NULL;
|
|
dev->tx_complete = RT_NULL;
|
|
|
|
if (rt_device_register(&(pipe->parent), name, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE) != 0)
|
|
{
|
|
rt_free(pipe);
|
|
return RT_NULL;
|
|
}
|
|
#if defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_POSIX_PIPE)
|
|
dev->fops = (void*)&pipe_fops;
|
|
#endif
|
|
|
|
return pipe;
|
|
}
|
|
|
|
/**
|
|
* @brief This function will delete a pipe device.
|
|
* The system will release the pipe handle and unregister the pipe device from the system.
|
|
*
|
|
* @param pipe is the pointer to the pipe device.
|
|
*
|
|
* @return Return the operation status.
|
|
* When the return value is 0, it means the operation is successful.
|
|
* When the return value is -RT_EINVAL, it means the pipe device is not found or the device isn't a pipe.
|
|
* When the return value is -RT_EBUSY, it means the pipe device is busy.
|
|
*/
|
|
int rt_pipe_delete(const char *name)
|
|
{
|
|
int result = 0;
|
|
rt_device_t device;
|
|
|
|
device = rt_device_find(name);
|
|
if (device)
|
|
{
|
|
if (device->type == RT_Device_Class_Pipe)
|
|
{
|
|
rt_pipe_t *pipe;
|
|
|
|
if (device->ref_count != 0)
|
|
{
|
|
return -RT_EBUSY;
|
|
}
|
|
|
|
pipe = (rt_pipe_t *)device;
|
|
|
|
rt_mutex_detach(&(pipe->lock));
|
|
rt_device_unregister(device);
|
|
|
|
/* close fifo ringbuffer */
|
|
if (pipe->fifo)
|
|
{
|
|
rt_ringbuffer_destroy(pipe->fifo);
|
|
pipe->fifo = RT_NULL;
|
|
}
|
|
rt_free(pipe);
|
|
}
|
|
else
|
|
{
|
|
result = -RT_EINVAL;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
result = -RT_EINVAL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#if defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_POSIX_PIPE)
|
|
/**
|
|
* @brief This function will creat a anonymous pipe.
|
|
*
|
|
* @param fildes[0] is the read handle.
|
|
* fildes[1] is the write handle.
|
|
*
|
|
* @return Return the operation status.
|
|
* When the return value is 0, it means the operation is successful.
|
|
* When the return value is -1, it means the operation is failed.
|
|
*/
|
|
int pipe(int fildes[2])
|
|
{
|
|
rt_pipe_t *pipe;
|
|
char dname[RT_NAME_MAX];
|
|
char dev_name[RT_NAME_MAX * 4];
|
|
static int pipeno = 0;
|
|
|
|
rt_snprintf(dname, sizeof(dname), "pipe%d", pipeno++);
|
|
|
|
pipe = rt_pipe_create(dname, RT_USING_POSIX_PIPE_SIZE);
|
|
if (pipe == RT_NULL)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
pipe->is_named = RT_FALSE; /* unamed pipe */
|
|
rt_snprintf(dev_name, sizeof(dev_name), "/dev/%s", dname);
|
|
fildes[0] = open(dev_name, O_RDONLY, 0);
|
|
if (fildes[0] < 0)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
fildes[1] = open(dev_name, O_WRONLY, 0);
|
|
if (fildes[1] < 0)
|
|
{
|
|
close(fildes[0]);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief This function will create a named pipe.
|
|
*
|
|
* @param path is the name of pipe device.
|
|
*
|
|
* @param mode is not used yet.
|
|
*
|
|
* @return Return the operation status.
|
|
* When the return value is 0, it means the operation is successful.
|
|
* When the return value is -1, it means the operation is failed.
|
|
*/
|
|
int mkfifo(const char *path, mode_t mode)
|
|
{
|
|
rt_pipe_t *pipe;
|
|
|
|
pipe = rt_pipe_create(path, RT_USING_POSIX_PIPE_SIZE);
|
|
if (pipe == RT_NULL)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* defined(RT_USING_POSIX_DEVIO) && defined(RT_USING_POSIX_PIPE) */
|