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我刚开始学习网络编程。我的第一个程序非常简单：连接后，服务器程序显示客户端程序发送的内容（字符）。一切正常，直到他们连接。起初，我没有使用putc将发送循环：简单的网络编程程序 - 不工作
while((c = getc(stdin)) != '\n')
putc(c, (FILE *) connection);
和接收一个与GETC：
while((c = getc((FILE *) connection)) != '\n')
putc(c, stdout);
连接后，我得到一个分段错误。然后，我尝试使用派：
while(1) {
memset(str, null, strlen(memset));
while(((c = getc(stdin)) != '\n') && sizeof(str) <= 100) {
strcat(str, (char *) c); // cast to char * is to make gcc happy
}
send(connection, (void *) str, sizeof(str), (int) NULL);
}
和recv：
while((stat = recv(connection,str,100,0)) != 0) {
printf("\nReceived %d bytes of data from %s: %s", stat, client, str);
}
现在的recv（）返回不断-1，errno设置为107。这是什么意思？我在哪里做错了？顺便说一句，我使用Linux和gcc。
非常感谢您的帮助！ :)
编辑：即使我使用的getc（）和putc（），我与插座（连接），然后我连接（）（客户端）。服务器在获得连接（使用socket（））bind（）s后，listen（）s和accept（）s。对不起，如果我ometted。
这里的服务器代码：
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
void main(int argc, char *argv[])
{
struct addrinfo hint;
struct addrinfo *servinfo, *count;
struct sockaddr_storage conn_addr;
struct sockaddr host;
int connessione;
int stat;
int conn_sock;
int conn_size;
int success;
int c;
char t[INET_ADDRSTRLEN];
char str[100];
char *client;
if(argc != 1 && strcmp(argv[1], "aiuto") == 0) {
printf("%s(porta)\n",argv[0]);
printf("porta: specifica su quale porta installarsi\n");
exit(-1);
}
memset(&hint,0,sizeof hint);
hint.ai_family = AF_INET;
hint.ai_socktype = SOCK_STREAM;
hint.ai_flags = AI_PASSIVE;
if((stat = getaddrinfo(NULL, argv[1], &hint, &servinfo)) != 0) {
printf("\n[FATAL]: getaddrinfo: %s",gai_strerror(stat));
exit(-1);
}
success = 0;
for(count = servinfo; count != NULL; count = count->ai_next) {
if((connessione = socket(count->ai_family, count->ai_socktype, count->ai_protocol)) <= 0)
continue;
if((stat = bind(connessione, count->ai_addr, count->ai_addrlen)) == 0) {
success = 1;
break;
}
else {
continue;
}
}
if(success == 0) {
printf("\n[FATAL]: Unable to bind()!\n");
exit(-1);
}
else {
printf("\n[DEBUG]: %s: listening...", argv[0]);
}
servinfo = count;
freeaddrinfo(count);
if(listen(connessione, 20) == -1) {
printf("\n[FATAL]: listen: %s (%d)\n", gai_strerror(errno), errno);
close(connessione);
exit(-1);
}
conn_size = sizeof(conn_addr);
if(accept(connessione, (struct sockaddr *) &conn_addr, &conn_size) == -1) {
printf("\n[FATAL]: accept: %s", gai_strerror(errno));
close(connessione);
exit(-1);
}
client = (char *) malloc(INET_ADDRSTRLEN * sizeof(char));
client = inet_ntop(servinfo->ai_family, &conn_addr, t, INET_ADDRSTRLEN);
printf("\n[DEBUG]: %s: connection accepted: %s", argv[0], client);
while((stat = recv(connessione,str,100,0)) != 0) {
printf("\nReceived %d bytes of data from %s: %s", stat,client, str);
}
printf("\n[DEBUG]: connection closed by %s\n",client);
}
和客户端的代码：
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
void main(int argc, char *argv[])
{
struct addrinfo hint;
struct addrinfo *servinfo, *count;
struct sockaddr_storage conn_addr;
struct sockaddr host;
int connessione;
int stat;
int conn_sock;
int conn_size;
int success;
int c;
char t[INET_ADDRSTRLEN];
char *indirizzo;
char str[100];
memset(&hint,0,sizeof hint);
host.sa_family = AF_INET;
if(inet_pton(host.sa_family, argv[1], (void *) host.sa_data) == -1) {
printf("\n[FATAL]: pton: %s (%d)\n", gai_strerror(errno), errno);
exit(-1);
}
hint.ai_family = AF_INET;
hint.ai_socktype = SOCK_STREAM;
hint.ai_flags = AI_PASSIVE;
hint.ai_addr = &host;
if((stat = getaddrinfo(argv[1], argv[2], &hint, &servinfo)) != 0) {
printf("[FATAL]: getaddrinfo: %s\n",gai_strerror(stat));
exit(-1);
}
success = 0;
for(count = servinfo; count != NULL; count = count->ai_next) {
if((connessione = socket(count->ai_family, count->ai_socktype, count->ai_protocol)) == -1)
continue;
if(connect(connessione, count->ai_addr, count->ai_addrlen) != -1) {
success = 1;
break;
}
}
if(success == 0) {
printf("\n[FATAL]: impossibile trovare l'host specificato\n");
exit(-1);
}
servinfo = count;
freeaddrinfo(count);
indirizzo = (char *) malloc(INET_ADDRSTRLEN * sizeof(char));
indirizzo = inet_ntop(servinfo->ai_family, &conn_addr, t, INET_ADDRSTRLEN);
printf("\n[DEBUG]: %s: connesso a: %s\n",argv[0], indirizzo);
while(1) {
strcpy(str,"buffer for data to send");
while(((c = getc(stdin)) != '\n') && sizeof(str) <= 100) {
strcat(str, (char *) c);
}
send(connessione, (void *) str, sizeof(str), (int) NULL);
}
}
在结束...
它完美！感谢大家。 :)
如何使用期望文件句柄的函数进行网络编程？ '连接'的价值是什么？基本上，你应该使用'套接字/发送/接收'。 – KevinDTimm 2010-12-06 18:42:56
Linux上的107是“ENOTCONN”。代码'getc（（FILE *）connection））'看起来很可疑：'连接'的类型是什么？ – vanza 2010-12-06 18:44:07
int。用socket（）获得。 – BlackBear 2010-12-06 18:50:32