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