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
1: #define USOCK_TCP 0
2: #define USOCK_UDP 1
3: #define USOCK_SERVER 0x0100
4: #define USOCK_NOCLOEXEC 0x0200
5: #define USOCK_NONBLOCK 0x0400
6: #define USOCK_NUMERIC 0x0800
7: #define USOCK_IPV6ONLY 0x2000
8: #define USOCK_IPV4ONLY 0x4000
9: #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
1: #include <stdio.h>
2: #include <stdlib.h>
3: #include <string.h>
4: #include <sys/types.h> /* See NOTES */
5: #include <sys/socket.h>
6: #include <netinet/in.h>
7: #include <arpa/inet.h>
8: #include <libubox/usock.h>
9:
10: int main()
11: {
12: struct sockaddr_in cli_addr;
13: socklen_t len = sizeof(struct sockaddr);
14: int type = USOCK_TCP | USOCK_SERVER | USOCK_NOCLOEXEC | USOCK_IPV4ONLY;
15: const char *host = "CarRadio";
16: const char *service = "8000";
17: char recv_buf[1024] = {0};
18: int connect_fd, u_fd = usock(type, host, service);
19: if (u_fd < 0) {
20: perror("usock");
21: return -1;
22: }
23: while (1) {
24: connect_fd = accept(u_fd, (struct sockaddr *)(&cli_addr), &len);
25: if (connect_fd < 0) {
26: perror("accept");
27: return -1;
28: }
29: printf("client_addr: %s\n", inet_ntoa(cli_addr.sin_addr));
30: recv(connect_fd, recv_buf, 1024, 0);
31: printf("recv %s\n", recv_buf);
32: close(connect_fd);
33: }
34:
35: return 0;
36: }
37:
client代码：
1: #include <stdio.h>
2: #include <stdlib.h>
3: #include <string.h>
4: #include <sys/types.h> /* See NOTES */
5: #include <sys/socket.h>
6: #include <libubox/usock.h>
7:
8: int main()
9: {
10: struct sockaddr cli_addr;
11: socklen_t len = sizeof(struct sockaddr);
12: int type = USOCK_TCP | USOCK_NOCLOEXEC | USOCK_IPV4ONLY;
13: const char *host = "CarRadio";
14: const char *service = "8000";
15: char recv_buf[1024] = {0};
16: int c_fd = usock(type, host, service); /* create a linker socket*/
17: if (c_fd < 0) {
18: perror("usock");
19: return -1;
20: }
21: send(c_fd, "helloworld", 10, 0);
22: sleep(10);
23: close(c_fd);
24: return 0;
25: }
makefile文件：
1: include $(TOPDIR)/rules.mk
2:
3: PKG_NAME:=usocket
4: PKG_RELEASE:=1.0.0
5:
6: PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
7:
8: include $(INCLUDE_DIR)/package.mk
9:
10: define Package/$(PKG_NAME)
11: CATEGORY:=Utilities
12: SUBMENU:=Demo
13: DEPENDS:=+libubox
14: TITLE:= usocket test project.
15: endef
16:
17: define Package/$(PKG_NAME)/description
18: If you can't figure out what this program does, you're probably
19: brain-dead and need immediate medical attention.
20: endef
21:
22:
23: define Build/Prepare
24: mkdir -p $(PKG_BUILD_DIR)
25: $(CP) ./src/* $(PKG_BUILD_DIR)/
26: endef
27:
28: define Package/$(PKG_NAME)/install
29: $(INSTALL_DIR) $(1)/bin
30: $(INSTALL_BIN) $(PKG_BUILD_DIR)/userver $(1)/bin/
31: $(INSTALL_BIN) $(PKG_BUILD_DIR)/uclient $(1)/bin/
32: endef
33:
34: $(eval $(call BuildPackage,$(PKG_NAME)))
35:
36:
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
