linux下用户程序同内核通信详解（netlink机制）

4. ./netlink/usrlink.h

/* 
 * usrlink.h 
 * 
 * Created on: 2014骞?鏈?7鏃? *  Author: cr 
 */ 
#ifndef USRLINK_H_ 
#define USRLINK_H_ 
 
#define USER_NETLINK_CMD 25 
#define MAXMSGLEN   1024 
 
typedef enum error_e { 
 NET_ERROR, 
 NET_OK, 
 NET_PARAM, 
 NET_MEM, 
 NET_SOCK, 
} netlink_err; 
 
typedef enum module_e { 
 HELLO_CMD = 1, 
} netlink_module; 
 
typedef enum type_e { 
 HELLO_SET, 
 HELLO_GET, 
} netlink_type; 
 
#endif /* USRLINK_H_ */ 

5. ./netlink/Makefile

MOD_NAME := netlink 
 
$(MOD_NAME)-objs : netlink.o 
 
-include $(MODULES_ROOT_DIR)/rules.dir 
 
.PHONY: 

6. 编译方式。

其中Makefile、rulers.dir 在Knetlink/下， netlink.c 、netlink.h 、Makefile在Knetlink/netlink/目录下。 编译时在Knetlink目录下执行Make即可

用户程序

用户程序的Makefile 这里就不放出了。 我是直接在eclipse下建的工程 自动编译的、...

1. netlink.c

/* 
 * usrlink.c 
 * 
 * Created on: 2014骞?鏈?7鏃? *  Author: cr 
 */ 
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <unistd.h> 
#include "usrlink.h" 
 
int netlink_sock_init(netlink_sock *netlink_s, int module, int protocol) 
{ 
 netlink_s->sock = socket(PF_NETLINK, SOCK_RAW, protocol); 
 if(netlink_s->sock < 0) 
  return NET_SOCK; 
 memset(&netlink_s->src, 0 ,sizeof(netlink_s->src)); 
 netlink_s->src.nl_family = AF_NETLINK; 
 netlink_s->src.nl_pid = module; 
 netlink_s->src.nl_groups = 0; 
 
 if(bind(netlink_s->sock, (struct sockaddr *)&netlink_s->src, sizeof(netlink_s->src)) < 0) 
  return NET_SOCK; 
 
 netlink_s->dest.nl_family = AF_NETLINK; 
 netlink_s->dest.nl_pid = 0; 
 netlink_s->dest.nl_groups = 0; 
 
 return NET_OK; 
} 
 
int netlink_send(netlink_sock *netlink_s, int type, char *sbuf, int slen, char *rbuf, int *rlen) 
{ 
 struct msghdr msg; 
 struct nlmsghdr *nlhdr = NULL; 
 struct iovec iov; 
 int ret; 
 
 nlhdr = (struct nlmsghdr *)malloc(NLMSG_SPACE(MAXMSGLEN)); 
 if(NULL == nlhdr) 
  return NET_MEM; 
 
 memcpy(NLMSG_DATA(nlhdr), sbuf, slen); 
 nlhdr->nlmsg_len = NLMSG_SPACE(slen); 
 nlhdr->nlmsg_pid = netlink_s->src.nl_pid; 
 nlhdr->nlmsg_type = type; 
 nlhdr->nlmsg_flags = 0; 
 
 iov.iov_base = (void *)nlhdr; 
 iov.iov_len = nlhdr->nlmsg_len; 
 
 msg.msg_name = (void *)&(netlink_s->dest); 
 msg.msg_namelen = sizeof(netlink_s->dest); 
 msg.msg_iov = &iov; 
 msg.msg_iovlen = 1; 
 
 ret = sendmsg(netlink_s->sock, &msg, 0); 
 if(ret < 0) 
 { 
  printf("Send failn"); 
  goto error; 
 } 
 ret = recvmsg(netlink_s->sock, &msg, 0); 
 if(ret < 0) 
 { 
  printf("Read failn"); 
  goto error; 
 } 
 memcpy(rbuf, NLMSG_DATA(nlhdr), nlhdr->nlmsg_len); 
 *rlen = nlhdr->nlmsg_len; 
 return NET_OK; 
 
error: 
 free(nlhdr); 
 return NET_SOCK; 
} 
 
int netlink_sock_deinit(netlink_sock *netlink_s) 
{ 
 close(netlink_s->sock); 
 memset(netlink_s, 0, sizeof(netlink_sock)); 
 return NET_OK; 
} 								 
 3/4   首页 上一页 1 2 3 4 下一页 尾页