fs: Add file_pipe function
so pty don't need call nx_pipe and then file_detach Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: Ibb8d108abd76bafe53897e5fca35babcf3e1bae9
This commit is contained in:
Xiang Xiao
archer
parent
4d4cba41f6
commit
a24ff44ae6
@ -158,6 +158,83 @@ static int pipe_close(FAR struct file *filep)
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return ret;
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}
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/****************************************************************************
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* Name: pipe_register
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****************************************************************************/
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static int pipe_register(size_t bufsize, int flags,
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FAR char *devname, size_t namesize)
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{
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FAR struct pipe_dev_s *dev;
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int pipeno;
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int ret;
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/* Get exclusive access to the pipe allocation data */
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ret = nxsem_wait(&g_pipesem);
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if (ret < 0)
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{
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goto errout;
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}
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/* Allocate a minor number for the pipe device */
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pipeno = pipe_allocate();
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if (pipeno < 0)
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{
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ret = pipeno;
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goto errout_with_sem;
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}
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/* Create a pathname to the pipe device */
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snprintf(devname, namesize, "/dev/pipe%d", pipeno);
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/* Check if the pipe device has already been created */
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if ((g_pipecreated & (1 << pipeno)) == 0)
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{
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/* No.. Allocate and initialize a new device structure instance */
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dev = pipecommon_allocdev(bufsize);
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if (!dev)
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{
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ret = -ENOMEM;
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goto errout_with_pipe;
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}
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dev->d_pipeno = pipeno;
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/* Register the pipe device */
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ret = register_driver(devname, &pipe_fops, 0666, (FAR void *)dev);
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if (ret != 0)
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{
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nxsem_post(&g_pipesem);
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goto errout_with_dev;
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}
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/* Remember that we created this device */
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g_pipecreated |= (1 << pipeno);
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}
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nxsem_post(&g_pipesem);
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return OK;
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errout_with_dev:
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pipecommon_freedev(dev);
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errout_with_pipe:
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pipe_free(pipeno);
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errout_with_sem:
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nxsem_post(&g_pipesem);
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errout:
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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@ -186,66 +263,57 @@ static int pipe_close(FAR struct file *filep)
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*
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****************************************************************************/
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int nx_pipe(int fd[2], size_t bufsize, int flags)
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int file_pipe(FAR struct file *filep[2], size_t bufsize, int flags)
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{
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FAR struct pipe_dev_s *dev = NULL;
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char devname[16];
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int pipeno;
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int ret;
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/* Get exclusive access to the pipe allocation data */
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/* Register a new pipe device */
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ret = nxsem_wait(&g_pipesem);
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ret = pipe_register(bufsize, flags, devname, sizeof(devname));
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if (ret < 0)
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{
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goto errout;
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return ret;
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}
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/* Allocate a minor number for the pipe device */
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/* Get a write file descriptor */
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pipeno = pipe_allocate();
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if (pipeno < 0)
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ret = file_open(filep[1], devname, O_WRONLY | flags);
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if (ret < 0)
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{
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nxsem_post(&g_pipesem);
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ret = pipeno;
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goto errout;
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goto errout_with_driver;
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}
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/* Create a pathname to the pipe device */
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/* Get a read file descriptor */
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snprintf(devname, sizeof(devname), "/dev/pipe%d", pipeno);
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/* Check if the pipe device has already been created */
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if ((g_pipecreated & (1 << pipeno)) == 0)
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ret = file_open(filep[0], devname, O_RDONLY | flags);
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if (ret < 0)
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{
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/* No.. Allocate and initialize a new device structure instance */
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dev = pipecommon_allocdev(bufsize);
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if (!dev)
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{
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nxsem_post(&g_pipesem);
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ret = -ENOMEM;
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goto errout_with_pipe;
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}
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dev->d_pipeno = pipeno;
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/* Register the pipe device */
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ret = register_driver(devname, &pipe_fops, 0666, (FAR void *)dev);
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if (ret != 0)
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{
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nxsem_post(&g_pipesem);
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goto errout_with_dev;
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}
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/* Remember that we created this device */
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g_pipecreated |= (1 << pipeno);
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goto errout_with_wrfd;
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}
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nxsem_post(&g_pipesem);
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return OK;
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errout_with_wrfd:
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file_close(filep[1]);
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errout_with_driver:
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unregister_driver(devname);
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return ret;
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}
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int nx_pipe(int fd[2], size_t bufsize, int flags)
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{
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char devname[16];
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int ret;
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/* Register a new pipe device */
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ret = pipe_register(bufsize, flags, devname, sizeof(devname));
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if (ret < 0)
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{
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return ret;
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}
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/* Get a write file descriptor */
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@ -272,17 +340,6 @@ errout_with_wrfd:
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errout_with_driver:
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unregister_driver(devname);
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errout_with_dev:
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if (dev)
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{
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pipecommon_freedev(dev);
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}
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errout_with_pipe:
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pipe_free(pipeno);
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errout:
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return ret;
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}
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@ -1080,8 +1080,8 @@ static int pty_unlink(FAR struct inode *inode)
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int pty_register(int minor)
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{
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FAR struct pty_devpair_s *devpair;
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int pipe_a[2];
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int pipe_b[2];
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FAR struct file *pipe_a[2];
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FAR struct file *pipe_b[2];
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char devname[16];
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int ret;
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@ -1118,56 +1118,24 @@ int pty_register(int minor)
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* pipe_b: Master sink, slave source (RX, master-to-slave)
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*/
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ret = nx_pipe(pipe_a, CONFIG_PSEUDOTERM_TXBUFSIZE, 0);
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pipe_a[0] = &devpair->pp_master.pd_src;
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pipe_a[1] = &devpair->pp_slave.pd_sink;
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ret = file_pipe(pipe_a, CONFIG_PSEUDOTERM_TXBUFSIZE, 0);
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if (ret < 0)
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{
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goto errout_with_devpair;
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}
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ret = nx_pipe(pipe_b, CONFIG_PSEUDOTERM_RXBUFSIZE, 0);
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pipe_b[0] = &devpair->pp_slave.pd_src;
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pipe_b[1] = &devpair->pp_master.pd_sink;
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ret = file_pipe(pipe_b, CONFIG_PSEUDOTERM_RXBUFSIZE, 0);
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if (ret < 0)
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{
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goto errout_with_pipea;
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}
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/* Detach the pipe file descriptors (closing them in the process)
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*
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* fd[0] is for reading;
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* fd[1] is for writing.
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*/
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ret = file_detach(pipe_a[0], &devpair->pp_master.pd_src);
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if (ret < 0)
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{
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goto errout_with_pipeb;
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}
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pipe_a[0] = -1;
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ret = file_detach(pipe_a[1], &devpair->pp_slave.pd_sink);
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if (ret < 0)
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{
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goto errout_with_pipeb;
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}
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pipe_a[1] = -1;
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ret = file_detach(pipe_b[0], &devpair->pp_slave.pd_src);
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if (ret < 0)
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{
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goto errout_with_pipeb;
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}
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pipe_b[0] = -1;
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ret = file_detach(pipe_b[1], &devpair->pp_master.pd_sink);
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if (ret < 0)
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{
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goto errout_with_pipeb;
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}
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pipe_b[1] = -1;
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/* Register the slave device
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*
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* BSD style (deprecated): /dev/ttypN
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@ -1215,42 +1183,12 @@ errout_with_slave:
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unregister_driver(devname);
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errout_with_pipeb:
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if (pipe_b[0] >= 0)
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{
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close(pipe_b[0]);
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}
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else
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{
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file_close(&devpair->pp_master.pd_src);
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}
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if (pipe_b[1] >= 0)
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{
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close(pipe_b[1]);
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}
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else
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{
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file_close(&devpair->pp_slave.pd_sink);
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}
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file_close(pipe_b[0]);
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file_close(pipe_b[1]);
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errout_with_pipea:
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if (pipe_a[0] >= 0)
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{
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close(pipe_a[0]);
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}
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else
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{
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file_close(&devpair->pp_slave.pd_src);
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}
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if (pipe_a[1] >= 0)
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{
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close(pipe_a[1]);
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}
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else
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{
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file_close(&devpair->pp_master.pd_sink);
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}
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file_close(pipe_a[0]);
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file_close(pipe_a[1]);
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errout_with_devpair:
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nxsem_destroy(&devpair->pp_exclsem);
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@ -1492,6 +1492,7 @@ int nx_unlink(FAR const char *pathname);
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****************************************************************************/
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#if defined(CONFIG_PIPES) && CONFIG_DEV_PIPE_SIZE > 0
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int file_pipe(FAR struct file *filep[2], size_t bufsize, int flags);
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int nx_pipe(int fd[2], size_t bufsize, int flags);
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#endif
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