RELAY_OPEN(9) relay interface support RELAY_OPEN(9)NAME
relay_open - create a new relay channel
struct rchan * relay_open(const char * base_filename, struct dentry * parent, size_t subbuf_size, size_t n_subbufs,
struct rchan_callbacks * cb, void * private_data);
base name of files to create, NULL for buffering only
dentry of parent directory, NULL for root directory or buffer
size of sub-buffers
number of sub-buffers
client callback functions
Returns channel pointer if successful, NULL otherwise.
Creates a channel buffer for each cpu using the sizes and attributes specified. The created channel buffer files will be named
base_filename0...base_filenameN-1. File permissions will be S_IRUSR.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 RELAY_OPEN(9)
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DEBUGFS_CREATE_BOOL(9) The debugfs filesystem DEBUGFS_CREATE_BOOL(9)NAME
debugfs_create_bool - create a debugfs file that is used to read and write a boolean value
struct dentry * debugfs_create_bool(const char * name, umode_t mode, struct dentry * parent, u32 * value);
a pointer to a string containing the name of the file to create.
the permission that the file should have
a pointer to the parent dentry for this file. This should be a directory dentry if set. If this parameter is NULL, then the file will
be created in the root of the debugfs filesystem.
a pointer to the variable that the file should read to and write from.
This function creates a file in debugfs with the given name that contains the value of the variable value. If the mode variable is so set,
it can be read from, and written to.
This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the debugfs_remove function when the file is
to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, NULL will be
If debugfs is not enabled in the kernel, the value -ENODEV will be returned. It is not wise to check for this value, but rather, check for
NULL or !NULL instead as to eliminate the need for #ifdef in the calling code.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 DEBUGFS_CREATE_BOOL(9)
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