Current File : //usr/share/systemtap/runtime/transport/transport.h
#ifndef _TRANSPORT_TRANSPORT_H_ /* -*- linux-c -*- */
#define _TRANSPORT_TRANSPORT_H_
/** @file transport.h
* @brief Header file for stp transport
*/
#include "transport_msgs.h"
/* The size of print buffers. This limits the maximum */
/* amount of data a print can send. */
#define STP_BUFFER_SIZE 8192
/* STP_CTL_BUFFER_SIZE is the maximum size of a message */
/* exchanged on the control channel. */
#if STP_TRANSPORT_VERSION == 1
/* Old transport sends print output on control channel */
#define STP_CTL_BUFFER_SIZE STP_BUFFER_SIZE
#else
#define STP_CTL_BUFFER_SIZE 384
#endif
static unsigned _stp_nsubbufs;
static unsigned _stp_subbuf_size;
static pid_t _stp_target;
static int _stp_transport_init(void);
static void _stp_transport_close(void);
static int _stp_lock_transport_dir(void);
static void _stp_unlock_transport_dir(void);
static struct dentry *_stp_get_root_dir(void);
static struct dentry *_stp_get_module_dir(void);
static int _stp_transport_fs_init(const char *module_name);
static void _stp_transport_fs_close(void);
static void _stp_attach(void);
static void _stp_detach(void);
static void _stp_handle_start(struct _stp_msg_start *st);
static uid_t _stp_uid;
static gid_t _stp_gid;
static atomic_t _stp_ctl_attached;
static int _stp_bufsize;
enum _stp_transport_state {
STP_TRANSPORT_STOPPED,
STP_TRANSPORT_INITIALIZED,
STP_TRANSPORT_RUNNING,
};
/*
* All transports must provide the following functions.
*/
/*
* _stp_transport_get_state
*
* This function returns the current transport state.
*/
static enum _stp_transport_state _stp_transport_get_state(void);
/*
* _stp_transport_data_fs_init
*
* This function allocates any buffers needed, creates files,
* etc. needed for this transport.
*/
static int _stp_transport_data_fs_init(void);
/*
* _stp_transport_data_fs_start
*
* This function actually starts the transport.
*/
static void _stp_transport_data_fs_start(void);
/*
* _stp_transport_data_fs_start
*
* This function stops the transport without doing any cleanup.
*/
static void _stp_transport_data_fs_stop(void);
/*
* _stp_transport_data_fs_close
*
* This function cleans up items created by
* _stp_transport_data_fs_init().
*/
static void _stp_transport_data_fs_close(void);
/*
* _stp_transport_data_fs_overwrite - set data overwrite mode
* overwrite: boolean
*
* When in overwrite mode and the transport buffers are full, older
* data gets overwritten.
*/
static void _stp_transport_data_fs_overwrite(int overwrite);
/*
* _stp_data_write_reserve - reserve bytes
* size_request: number of bytes to reserve
* entry: allocated buffer is returned here
*
* This function attempts to reserve size_request number of bytes,
* returning the number of bytes actually reserved. The allocated
* buffer is returned in entry. Note that the number of bytes
* allocated may be less than the number of bytes requested.
*/
static size_t _stp_data_write_reserve(size_t size_request, void **entry);
/*
* _stp_data_entry_data - return data pointer from entry
* entry: entry
*
* This function returns the data pointer from entry.
*/
static unsigned char *_stp_data_entry_data(void *entry);
/*
* _stp_data_write_commit -
* entry: pointer returned by _stp-data_write_reserve()
*
* This function notifies the transport that the bytes in entry are
* ready to be written.
*/
static int _stp_data_write_commit(void *entry);
#endif /* _TRANSPORT_TRANSPORT_H_ */
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