Linux通信-unix通信

1 unix通信unix通信不经过协议栈处理，效率高2 源码path为绑定文件路径：例如'/tmp/ValinkGpsUnix'int unix_init(char *path){ int socketfd = -1; int ret = 0; int recvBufSize; socklen_t socketlen; struct sockaddr_un socket_addr; if(NULL == path){ debug(DEBUG_ERROR, "%s[%d] error\n", __func__, __LINE__); return -1; } //create  socket fd socketfd = socket(AF_UNIX, SOCK_DGRAM, 0); if(socketfd debug(DEBUG_ERROR, "%s[%d] error\n", __func__, __LINE__); return -1; } unlink(path); memset(&socket_addr, 0, sizeof(socket_addr)); socket_addr.sun_family = AF_UNIX; strncpy(socket_addr.sun_path, path, sizeof(socket_addr.sun_path)-1); //bind fd to socket_addr ret = bind(socketfd, (struct sockaddr*)&socket_addr, sizeof(socket_addr)); if(ret debug(DEBUG_ERROR, "%s[%d] error\n", __func__, __LINE__); return -1; }         socketlen = sizeof(recvBufSize); recvBufSize = UNIX_SIZE; ret = setsockopt(socketfd, SOL_SOCKET, SO_RCVBUF, &recvBufSize, socketlen); if(ret debug(DEBUG_ERROR, "%s[%d] error\n", __func__, __LINE__); return -1; }    return socketfd;}int unix_send(int fd, char *path, unsigned int length, char *data){ int res = 0; int sendlen = length; char *msgptr = data; int failurecount =0; struct sockaddr_un socket_addr; socklen_t socketlen; if(NULL == path || NULL == data){ debug(DEBUG_ERROR, "%s[%d] error\n", __func__, __LINE__); return -1; } socketlen = sizeof(socket_addr); memset(&socket_addr, 0, sizeof(socket_addr)); socket_addr.sun_family = AF_UNIX; strncpy(socket_addr.sun_path, path, sizeof(socket_addr.sun_path)-1); while((sendlen > 0) && (failurecount             res = sendto(fd, (void *)msgptr,  sendlen, 0, (struct sockaddr *)(&socket_addr), socketlen);   if(res > 0){ sendlen = (length - res); msgptr += res; }else{ failurecount ++; debug(DEBUG_ERROR,"%s[%d]Send retry !!\n", __func__, __LINE__); continue; } } if((failurecount > FAILURE_COUNT) && (sendlen > 0)){ debug(DEBUG_ERROR, "%s[%d] error\n", __func__, __LINE__); return -1; } return 0;}