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procfs skeleton file should include an example write method.

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This commit is contained in:
Gregory Nutt 2017-02-15 12:40:30 -06:00
parent c67943ed1d
commit 504f677c20
1 changed files with 58 additions and 7 deletions
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65
fs/procfs/fs_skeleton.c
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@ -107,7 +107,9 @@ static int skel_open(FAR struct file *filep, FAR const char *relpath,
static int skel_close(FAR struct file *filep);
static ssize_t skel_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
/* TODO: Should not support skel_write if read-only */
static ssize_t skel_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static int skel_dup(FAR const struct file *oldp,
FAR struct file *newp);
@ -137,9 +139,12 @@ const struct procfs_operations skel_procfsoperations =
skel_open, /* open */
skel_close, /* close */
skel_read, /* read */
/* TODO: Decide if this driver supports write */
/* TODO: Decide if this procfs entry supports write access */
#if 0 /* NULL if the procfs entry does not support write access. */
NULL, /* write */
#else
skel_write, /* write */
#endif
skel_dup, /* dup */
@ -190,7 +195,6 @@ static int skel_open(FAR struct file *filep, FAR const char *relpath,
/* TODO: Initialize the context specific data here */
/* Save the open file structure as the open-specific state in
* filep->f_priv.
*/
@ -221,6 +225,10 @@ static int skel_close(FAR struct file *filep)
/****************************************************************************
* Name: skel_read
*
* Description:
* Handle read from procfs file.
*
****************************************************************************/
static ssize_t skel_read(FAR struct file *filep, FAR char *buffer,
@ -236,7 +244,51 @@ static ssize_t skel_read(FAR struct file *filep, FAR char *buffer,
priv = (FAR struct skel_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* TODO: Provide the requested data */
/* TODO: Provide the requested data.
* Take into account current filep->f_pos and 'buflen'. The read could
* require several calls to skel_read().
*/
ret = 0;
/* Update the file offset */
if (ret > 0)
{
filep->f_pos += ret;
}
return ret;
}
/****************************************************************************
* Name: skel_write
*
* Description:
* Handle write3 to procfs file.
*
****************************************************************************/
/* TODO: Should not support skel_write if read-only */
static ssize_t skel_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct skel_file_s *priv;
ssize_t ret;
finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
priv = (FAR struct skel_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* TODO: Verify that the write is within range */
/* TODO: Handle the write data as appropriate to function of file.
* Take into account current filep->f_pos and 'buflen' since the write
* may require several calls to skel_write().
*/
ret = 0;
@ -317,8 +369,7 @@ static int skel_opendir(FAR const char *relpath, FAR struct fs_dirent_s *dir)
return -ENOMEM;
}
/* TODO: Initialze context specific data */
/* TODO: Initialize context specific data */
/* Initialze base structure components */