added lecture

TMP/Practice/lecture23.10/socket.c

@@ -0,0 +1,64 @@
+#include<sys/types.h>
+#include<sys/socket.h>
+#include<netinet/in.h>
+#include<netdb.h>
+#include<stdio.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<string.h>
+
+#define DATA "exit"
+
+int main(int argc, char *argv[]){
+    int sock;
+    socklen_t length;
+    struct sockaddr_in server;
+    int msgsock;
+    char buf[1024];
+    int rval;
+    sock = socket(AF_INET, SOCK_STREAM, 0);
+    if(sock == -1){
+        perror("opening stream socket");
+        exit(1);
+    }
+    server.sin_family = AF_INET;
+    server.sin_addr.s_addr = htoml(INADDR_ANY;
+    if(argc == 2){
+        server.sin_port = htons(atoi(argv[1]));
+    }
+    else{
+        server.sin_port = 0;
+    }
+    if(bind(sock, (struct sockaddr *) &server, sizeof server) == -1){
+        perror("binding stream socket");
+        exit(1);
+    }
+    length = sizeof server;
+    if(getsockname(sock,(struct sockaddr *) &server, &length) == -1){
+        perror("getting socket name");
+        exit(1);
+    }
+    printf("socket port %d\n", ntohs(server.sin_port));
+    listen(sock, 5);
+    do{
+        if((msgsock = accept(sock,(struct sockaddr *) NULL, (socklen_t *) NULL)) == -1){
+            perror("accept");
+        }
+        else
+            do{
+                memset(buf,0,sizeof buf);
+                if((rval = read(msgsock, buf, 1024)) == -1)
+                    perror("reading stream message");
+                dprintf(1, "-[%d]\n", rval);
+                if(rval == 0){
+                    printf("connecting finished\n");
+                }
+                else{
+                    dprintf(1,"[%s]\n", buf);
+                }
+            }while((rval > 0) && (strcmp(buf,FIN)));
+            close(msgsock);
+
+    }while(strcmp(buf,FIN));
+    exit(0);
+}