You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.3 KiB
64 lines
1.3 KiB
/**
|
|
* my implementation of a ringbuffer.
|
|
* It maps a shared memory object twice directly following
|
|
* thus make it possible to read and write from any
|
|
* position within the buffer without the nasty wrap
|
|
* calculations.
|
|
* This is achived because the same memory region is mapped
|
|
* at the two addresses.
|
|
*/
|
|
#ifndef __RINGBUFFER_H__
|
|
#define __RINGBUFFER_H__
|
|
|
|
#include <ctype.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
|
|
#include "class.h"
|
|
|
|
#define ECBUFOVFL 100
|
|
|
|
#ifndef TRUE
|
|
#define TRUE ((void *)1)
|
|
#endif
|
|
|
|
#ifndef FALSE
|
|
#define FALSE ((void *)0)
|
|
#endif
|
|
|
|
CLASS(Cbuf) {
|
|
char * shm_name; // shared memory identifier
|
|
|
|
char * data;
|
|
void * lock;
|
|
|
|
size_t bsize;
|
|
size_t bused;
|
|
|
|
size_t write;
|
|
size_t read;
|
|
};
|
|
|
|
ssize_t cbufRead(Cbuf, int fd);
|
|
ssize_t cbufWrite(Cbuf, int fd);
|
|
|
|
char * cbufGetLine(Cbuf);
|
|
char * cbufGetData(Cbuf, size_t);
|
|
char * cbufSetData(Cbuf, const void *, size_t);
|
|
|
|
char * cbufGetRead(Cbuf this);
|
|
char * cbufGetWrite(Cbuf this);
|
|
char * cbufMemchr(Cbuf this, int c);
|
|
size_t cbufAddrIndex(Cbuf this, const void * c);
|
|
void cbufIncRead(Cbuf this, size_t n);
|
|
void cbufIncWrite(Cbuf this, size_t n);
|
|
size_t cbufGetFree(Cbuf this);
|
|
char cbufIsEmpty(Cbuf this);
|
|
void cbufSkipNonAlpha(Cbuf this);
|
|
void * cbufIsLocked(Cbuf this);
|
|
void cbufLock(Cbuf this);
|
|
void cbufRelease(Cbuf this);
|
|
|
|
#endif // __RINGBUFFER_H__
|
|
|
|
// vim: set ts=4 sw=4:
|