libubox组件（1）——usock

一：相关API介绍

1.相关源码文件：usocket.h usocket.c

2.类型标志

#define USOCK_TCP 0
#define USOCK_UDP 1
#define USOCK_SERVER        0x0100
#define USOCK_NOCLOEXEC        0x0200
#define USOCK_NONBLOCK        0x0400
#define USOCK_NUMERIC        0x0800
#define USOCK_IPV6ONLY        0x2000
#define USOCK_IPV4ONLY        0x4000
#define USOCK_UNIX        0x8000
3.接口函数
/**
 * 创建一个新的网络sock
 * 
 * @param type - 类型标志
 * @param host - 作为server表示绑定本地地址；作为client表示需连接的地址
 * @param service - 端口
 * @return - sock fd > 0； 错误 < 0
 */

int usock(int type, const char *host, const char *service);

二：实例
server代码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libubox/usock.h>

int main()
{
    struct sockaddr_in cli_addr;
    socklen_t len = sizeof(struct sockaddr);
    int type = USOCK_TCP | USOCK_SERVER  | USOCK_NOCLOEXEC | USOCK_IPV4ONLY;
    const char *host = "CarRadio";
    const char *service = "8000";
    char recv_buf[1024] = {0};
    int connect_fd, u_fd = usock(type, host, service);
    if (u_fd < 0) {
        perror("usock");
        return -1;
    }
    while (1) {
        connect_fd = accept(u_fd, (struct sockaddr *)(&cli_addr), &len);
        if (connect_fd < 0) {
            perror("accept");
            return -1;
        }
        printf("client_addr: %s
", inet_ntoa(cli_addr.sin_addr));
        recv(connect_fd, recv_buf, 1024, 0);
        printf("recv %s
", recv_buf);
        close(connect_fd);
    }

    return 0;
}

 

client代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <libubox/usock.h>

int main()
{
    struct sockaddr cli_addr;
    socklen_t len = sizeof(struct sockaddr);
    int type = USOCK_TCP  | USOCK_NOCLOEXEC | USOCK_IPV4ONLY;
    const char *host = "CarRadio";
    const char *service = "8000";
    char recv_buf[1024] = {0};
    int c_fd = usock(type, host, service);    /* create a linker socket*/
    if (c_fd < 0) {
        perror("usock");
        return -1;
    }
    send(c_fd, "helloworld", 10, 0);
    sleep(10);
    close(c_fd);
    return 0;
}

 

 

makefile文件：

include $(TOPDIR)/rules.mk

PKG_NAME:=usocket
PKG_RELEASE:=1.0.0

PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk

define Package/$(PKG_NAME)
    CATEGORY:=Utilities
    SUBMENU:=Demo
    DEPENDS:=+libubox
    TITLE:= usocket test project.
endef

define Package/$(PKG_NAME)/description
    If you can't figure out what this program does, you're probably
    brain-dead and need immediate medical attention.
endef


define Build/Prepare
    mkdir -p $(PKG_BUILD_DIR)
    $(CP) ./src/* $(PKG_BUILD_DIR)/
endef

define Package/$(PKG_NAME)/install
    $(INSTALL_DIR) $(1)/bin
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/userver $(1)/bin/
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/uclient $(1)/bin/
endef

$(eval $(call BuildPackage,$(PKG_NAME)))

 

 

以上代码是一个简单的TCP测试代码

运行结果：

client_addr: 192.168.2.254

recv helloworld