13.2 readv & writev 函数

ch13/peek_send.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+    int sock;
+    struct sockaddr_in send_adr;
+    if (argc != 3)
+    {
+        printf("Usage : %s <IP> <port>\n", argv[0]);
+        exit(1);
+    }
+    sock = socket(PF_INET, SOCK_STREAM, 0);
+    memset(&send_adr, 0, sizeof(send_adr));
+    send_adr.sin_family = AF_INET;
+    send_adr.sin_addr.s_addr = inet_addr(argv[1]);
+    send_adr.sin_port = htons(atoi(argv[2]));
+
+    if (connect(sock, (struct sockaddr *)&send_adr, sizeof(send_adr)) == -1)
+        error_handling("connect() error");
+
+    write(sock, "123", strlen("123"));
+    close(sock);
+    return 0;
+}
+
+void error_handling(char *message)
+{
+    fputs(message, stderr);
+    fputc('\n', stderr);
+    exit(1);
+}