mypipe_linux.c

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/*
*
*mypipe.c 读写管道 lin shao chuan
*
*/

#include "mypipe.h"

#include <stdlib.h>
#include <unistd.h>

#include "os_def.h"
#include "mylog.h"


typedef struct __mypipe_t_
{
	int fd[2];
	HMYMEMPOOL hm;
}mypipe_t;


/*
*
*创建管道
*
*/
HMYPIPE MyPipeConstruct(HMYMEMPOOL hm)
{
	int ret = 0;
	mypipe_t * p = (mypipe_t *)MyMemPoolMalloc(hm, sizeof(*p));	
	if(NULL == p)
		return NULL;

	p->hm = hm;
	ret = pipe(p->fd);

	if(0 != ret)
	{
		LOG_WARN(("fail create pipe"));

		MyMemPoolFree(hm, p);
		return NULL;
	}
	
	return (HMYPIPE)p;
}

/*
*
*销毁管道
*
*/
void MyPipeDestruct(HMYPIPE hp)
{
	mypipe_t * p = (mypipe_t *)hp;	
	if(NULL == p)
		return;

	close(p->fd[0]);
	close(p->fd[1]);
	
	MyMemPoolFree(p->hm, p);
}

/*
*
*读管道
*
*/
size_t MyPipeRead(HMYPIPE hp, void * data, size_t data_len)
{
	mypipe_t * p = (mypipe_t *)hp;	
	if(NULL == p)
		return 0;

	return read(p->fd[0], data, data_len);
}

/*
*
*写管道
*
*/
size_t MyPipeWrite(HMYPIPE hp, void * data, size_t data_len)
{
	mypipe_t * p = (mypipe_t *)hp;	
	if(NULL == p)
		return 0;

	return write(p->fd[1], data, data_len);
}

/*
*
*获取读fd
*
*/
int MyPipeGetReadFD(HMYPIPE hp)
{
	mypipe_t * p = (mypipe_t *)hp;	
	if(NULL == p)
		return INVALID_FD;

	return p->fd[0];
}

/*
*
*获取写fd
*
*/
int MyPipeGetWriteFD(HMYPIPE hp)
{
	mypipe_t * p = (mypipe_t *)hp;	
	if(NULL == p)
		return INVALID_FD;

	return p->fd[1];
}