test.c

socket程序大家见多了

#ifndef AUTO_SCRIPTE
#define AUTO_SCRIPTE

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>

#include <sys/stat.h>
#include <sys/select.h>
#include <sys/time.h>
#include <time.h>
#include <sys/mman.h>

#include <fcntl.h>
#include <errno.h>

#define DEV_PATH            "/dev/test"

typedef enum _IOCTL_CMD
{
	IOCTL_SET_SOCKET_FD     =   0x7F,       /*用户态向内核态 SET一个socket 描述字*/
	IOCTL_TEST_OPTION       =   0x80,       /*用来测试的IOCTL选项*/
	IOCTL_SEND_UDP_PACKET   =   0x81,       /*发送一个 UDP 数据报文*/
	IOCTL_WRITE_UDP_PACKET  =   0x82,       /*write 一个UDP数据报文，结果同上*/
	IOCTL_SEND_TCP_PACKET   =   0x83,       /*发送TCP数据报文*/

} ioctl_cmd_enum;


/*
 *  发送数据包的数据结构
 *  TCP同 调用了connect 函数的UDP只需要前面4个参数够了
 *  而没有connect 的 UDP套件字描述符，需要填充后面两个参数
 */
typedef struct _SEND_PACKET_INFO_
{
	unsigned int  fd;
	unsigned char *data;
	unsigned int  len;
	unsigned int  flags;  

	struct sockaddr addr;
	unsigned int  addr_len;

} send_packet_info_t;

send_packet_info_t  send_packet_info;

int sock_dev_fd = -1;


int main( int argc, char *argv[] )
{
	int tmp_fd = -1, ret = -1;
	int index;
	int value = 0;
	unsigned char *tmp_text = NULL;
   
	if( argc == 2 )
		value	= atoi( argv[1] );
	
	sock_dev_fd = open( DEV_PATH, O_RDWR );
	if( 0 > sock_dev_fd )
	{
		fprintf( stderr, "Open %s failed: %s\n", DEV_PATH, strerror( errno ) );
		return -1;
	}
		
	tmp_text = ( unsigned char* )mmap( 0, 1024, PROT_READ | PROT_WRITE, MAP_SHARED, sock_dev_fd, 0 );
	if( MAP_FAILED == tmp_text )
	{
		fprintf( stderr, "mmap failed: %s.\n", strerror( errno ) );
		goto out;
	}	
	
	//tmp_text[3] = 'z';
	//tmp_text[4] = 'y';
	for( index=0; index < 20; index++ )
		printf( "%2x \n", tmp_text[index] );
	
	munmap( tmp_text, 0 );

	ioctl( sock_dev_fd, 0x44, NULL );
out:
	
	close( sock_dev_fd );
	
	return 0;
}

#endif /*#ifdef AUTO_SCRIPTE*/