C 服务器突然终止(非套接字上的套接字操作)
在运行此代码时,我没有看到打印的再见,而是在输入“Hello”时,它以“非套接字上的套接字操作”作为错误终止。此外,当我从客户端发送消息时(使用localhost ubuntu/多个控制台)。我只能看到来自第二个控制台(客户端)的消息向上,但不是从第一个客户端开始。当消息显示后,连接终止。对于第一个客户端,它只是等待 c语言中的服务器代码C 服务器突然终止(非套接字上的套接字操作),c,sockets,gnu,C,Sockets,Gnu,在运行此代码时,我没有看到打印的再见,而是在输入“Hello”时,它以“非套接字上的套接字操作”作为错误终止。此外,当我从客户端发送消息时(使用localhost ubuntu/多个控制台)。我只能看到来自第二个控制台(客户端)的消息向上,但不是从第一个客户端开始。当消息显示后,连接终止。对于第一个客户端,它只是等待 c语言中的服务器代码 #include <stdio.h> #include <sys/time.h> #include <sys/types.h&g
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#define PORT "3490"
#define STDIN 0
#define STDOUT 1
char *opt;
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
int main(void)
{
fd_set master;
fd_set read_fds;
int fdmax;
// master file descriptor list
// temp file descriptor list for select()
// maximum file descriptor number
int listener;
// listening socket descriptor
int newfd;
// newly accept()ed socket descriptor
struct sockaddr_storage remoteaddr; // client address
socklen_t addrlen;
char buf[256];
int nbytes;
// buffer for client data
char remoteIP[INET6_ADDRSTRLEN];
int yes=1;
int i, j, rv;
// for setsockopt() SO_REUSEADDR, below
struct addrinfo hints, *ai, *p;
FD_ZERO(&master);
FD_ZERO(&read_fds);
// clear the master and temp sets
// get us a socket and bind it
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ((rv = getaddrinfo(NULL, PORT, &hints, &ai)) != 0) {
fprintf(stderr, "selectserver: %s\n", gai_strerror(rv));
exit(1);
}
for(p = ai; p != NULL; p = p->ai_next) {
listener = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (listener < 0) {
continue;
}
// lose the pesky "address already in use" error message
setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
if (bind(listener, p->ai_addr, p->ai_addrlen) < 0) {
close(listener);
continue;
}
break;
}
// if we got here, it means we didn't get bound
if (p == NULL) {
fprintf(stderr, "selectserver: failed to bind\n");
exit(2);
}
freeaddrinfo(ai); // all done with this
// listen
if (listen(listener, 10) == -1) {
perror("listen");
exit(3);
}
// add the listener to the master set
FD_SET(listener, &master);
FD_SET(STDIN,&master);
// keep track of the biggest file descriptor
fdmax = listener; // so far, it's this one
// main loop
for(;;) {
read_fds = master; // copy it
if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
perror("select");
exit(4);
}
// run through the existing connections looking for data to read
for(i = 0; i <= fdmax; i++) {
if (FD_ISSET(i, &read_fds)) { // we got one!!
if (i == listener) {
// handle new connections
addrlen = sizeof remoteaddr;
newfd = accept(listener,
(struct sockaddr *)&remoteaddr,
&addrlen);
if (newfd == -1) {
perror("accept");
} else {
FD_SET(newfd, &master); // add to master set
if (newfd > fdmax) {
// keep track of the max
fdmax = newfd;
}
printf("selectserver: new connection from %s on "
"socket %d\n",inet_ntop(remoteaddr.ss_family,
get_in_addr((struct sockaddr*)&remoteaddr),
remoteIP, INET6_ADDRSTRLEN),
newfd);
}
} else {
// handle data from a client
if ((nbytes = recv(i, buf, sizeof buf, 0)) <= 0) {
// got error or connection closed by client
if (nbytes == 0) {
// connection closed
printf("selectserver: socket %d hung up\n", i);
} else {
perror("recv");
}
close(i); // bye!
FD_CLR(i, &master); // remove from master set
} else {
if(i==STDIN){
printf("Goodbye");
}
// we got some data from a client
for(j = 0; j <= fdmax; j++) {
// send to everyone!
if (FD_ISSET(j, &master)) {
// except the listener and ourselves
if (j != listener && j != i) {
if (send(j, buf, nbytes, 0) == -1) {
perror("send");
}
}
}
}
}
} // END handle data from client
} // END got new incoming connection
} // END looping through file descriptors
} // END for(;;)--and you thought it would never end!
return 0;
}
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#定义端口“3490”
#定义标准0
#定义标准输出1
字符*opt;
void*get\u in\u addr(结构sockaddr*sa)
{
如果(sa->sa_族==AF_INET){
return&(((struct sockaddr_in*)sa)->sin_addr);
}
返回((结构sockaddr_in6*)sa)->sin6_addr);
}
内部主(空)
{
fd_集主控器;
fd_设置读取_fds;
int-fdmax;
//主文件描述符列表
//select()的临时文件描述符列表
//最大文件描述符数
int侦听器;
//侦听套接字描述符
int-newfd;
//新添加的套接字描述符
struct sockaddr\u storage remoteaddr;//客户端地址
索克伦·阿德伦;
char-buf[256];
整数字节;
//客户端数据缓冲区
char remoteIP[INET6_ADDRSTRLEN];
int yes=1;
int i,j,rv;
//对于setsockopt(),请参见下文
结构addrinfo提示,*ai,*p;
FD_零和主设备;
FD_零(&read_fds);
//清除主设置和临时设置
//给我们拿个插座绑起来
memset(提示和提示,0,提示大小);
hits.ai_family=AF_unsec;
hits.ai_socktype=SOCK_流;
hits.ai_flags=ai_被动;
if((rv=getaddrinfo(NULL、端口、提示和ai))!=0){
fprintf(标准,“选择服务器:%s\n”,gai_strerror(rv));
出口(1);
}
for(p=ai;p!=NULL;p=p->ai\u下一步){
侦听器=套接字(p->ai_系列,p->ai_socktype,p->ai_协议);
if(侦听器<0){
继续;
}
//丢失令人讨厌的“地址已在使用”错误消息
setsockopt(监听器,SOL_套接字,SO_REUSEADDR,&yes,sizeof(int));
if(绑定(侦听器,p->ai_addr,p->ai_addrlen)<0){
关闭(侦听器);
继续;
}
打破
}
//如果我们到了这里,就意味着我们没有被束缚
if(p==NULL){
fprintf(stderr,“selectserver:绑定失败\n”);
出口(2);
}
freeaddrinfo(ai);//所有这些都完成了
//听
如果(侦听器,10)=-1){
佩罗尔(“倾听”);
出口(3);
}
//将侦听器添加到主集
FD_集(侦听器和主控器);
FD_装置(标准和主);
//跟踪最大的文件描述符
fdmax=listener;//到目前为止,是这个
//主回路
对于(;;){
read_fds=master;//复制它
如果(选择(fdmax+1,&read_-fds,NULL,NULL,NULL)=-1){
佩罗(“选择”);
出口(4);
}
//运行现有连接,查找要读取的数据
对于(i=0;i fdmax){
//跟踪最大值
fdmax=newfd;
}
printf(“在上选择服务器:来自%s的新连接”
“套接字%d\n”,inet\u ntop(remoteaddr.ss\u系列,
在地址中获取地址((结构sockaddr*)和远程地址),
remoteIP,iNet 6_ADDRSTRLEN),
新FD);
}
}否则{
//处理来自客户端的数据
如果((n字节=recv(i,buf,sizeof buf,0))sin_addr);
}
返回((结构sockaddr_in6*)sa)->sin6_addr);
}
void servcl_memset(){
memset(&hints,0,sizeof(hints));
hits.ai_family=AF_unsec;
hits.ai_socktype=SOCK_STREAM;
}
void cl_connect()
{
对于(ptr=loadinfo;ptr!=NULL;ptr=ptr->ai_next){
如果((侦听sd=socket(ptr->ai_系列,ptr->ai_socktype,ptr->ai_协议))=-1){
perror(“客户端:套接字”);
继续;
}
如果(连接(侦听、ptr->ai地址、ptr->ai地址)=-1){
关闭(收听sd);
perror(“客户:连接”);
继续;
}
打破
}
如果(ptr==NULL){
fprintf(stderr,“客户端:连接失败(绑定)\n”);
出口(0);
}
inet_ntop(ptr->ai_系列,get_in_addr((struct sockaddr*)ptr->ai_addr),s,sizeof s);
printf(“客户端:连接到%s\n”,s);
freeaddrinfo(loadinfo);//使用此结构完成所有操作
}
void init_套接字(){
对于(ptr=loadinfo;ptr!=NULL;ptr=ptr->ai_next){
如果((侦听sd=socket(ptr->ai_系列,ptr->ai_socktype,ptr->ai_协议))=-1){
perror(“服务器:套接字”);
继续;
}
rc=setsockopt(监听sd、SOL_套接字、SO_REUSEADDR、(char*)&on、sizeof(on));
if(rc<0)
{
perror(“setsockopt()失败”);
关闭(收听sd);
继续;
}
rc=bind(监听sd、ptr->ai地址、ptr->ai地址);
if(rc<0)
{
perror(“绑定()失败”);
关闭(收听sd);
继续;
}
打破
}//结束
如果(ptr==NULL){
fprintf(stderr,“客户端/服务器:连接失败(绑定)\n”);
出口(0);
}
freeaddrinfo(loadinfo);//使用此结构完成所有操作
}
void unblock(){
rc=ioctl(监听、飞行生物、(字符*)&on);
if(rc<0)
{
perror(“ioctl()失败”);
关闭(收听sd);
出口(-1);
}
}
void sock_listen(){
rc=监听(监听,32);
if(rc<0)
{
perror(“listen()失败”);
关闭(收听sd);
出口(-1);
}
/*************************************************************/
/*初始化主fd_集合
*/
/*************************************************************/
FD_零点和主_集);
max_sd=监听;
FD_集(0和主_集);
FD_集(监听_-sd和主_集);
}
无效连接超时(){
timeout.tv_sec=3*60;
timeout.tv_usec=0;
}
/*void client_listen(){
做
{
memcpy(&working_set,&master_set,sizeof(master_set));
printf(“正在等待选择()…\n”);
rc=select(最大sd+1,工作集,空,空,超时);
if(rc<0)
{
perror(“选择()失败”);
打破
}
如果(rc==0)
{
printf(“select()超时。结束程序。\n”);
打破
}
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/time.h>
#define TRUE 1
#define FALSE 0
//Var
int mode,info;
int PORT;
char *ip_host;
int i,len,rc,on=1;
int listen_sd,max_sd,new_sd;
int desc_ready,end_server=FALSE;
int close_conn;
char buffer[256];
//struct sockaddr_in addr;
struct timeval timeout;
fd_set master_set,working_set;
struct sockaddr_storage remoteaddr; // client addres//s
socklen_t addrlen;
char remoteIP[INET6_ADDRSTRLEN];
char s[INET6_ADDRSTRLEN];
struct addrinfo hints, *loadinfo, *ptr;
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
void servcl_memset(){
memset(&hints, 0, sizeof(hints));
hints.ai_family= AF_UNSPEC;
hints.ai_socktype= SOCK_STREAM;
}
void cl_connect()
{
for(ptr = loadinfo; ptr != NULL; ptr = ptr->ai_next) {
if ((listen_sd = socket(ptr->ai_family, ptr->ai_socktype,ptr->ai_protocol)) == -1) {
perror("client: socket");
continue;
}
if (connect(listen_sd, ptr->ai_addr, ptr->ai_addrlen) == -1) {
close(listen_sd);
perror("client: connect");
continue;
}
break;
}
if (ptr == NULL) {
fprintf(stderr, "client: failed to connect(bind)\n");
exit(0);
}
inet_ntop(ptr->ai_family, get_in_addr((struct sockaddr *)ptr->ai_addr),s, sizeof s);
printf("client: connecting to %s\n", s);
freeaddrinfo(loadinfo); // all done with this structure
}
void init_socket(){
for(ptr = loadinfo; ptr != NULL; ptr = ptr->ai_next) {
if ((listen_sd = socket(ptr->ai_family, ptr->ai_socktype,ptr->ai_protocol)) == -1) {
perror("server: socket");
continue;
}
rc = setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR,(char *)&on, sizeof(on));
if (rc < 0)
{
perror("setsockopt() failed");
close(listen_sd);
continue;
}
rc = bind(listen_sd,ptr->ai_addr,ptr->ai_addrlen);
if (rc < 0)
{
perror("bind() failed");
close(listen_sd);
continue;
}
break;
}//End For
if (ptr == NULL) {
fprintf(stderr, "client/server: failed to connect(bind)\n");
exit(0);
}
freeaddrinfo(loadinfo); // all done with this structure
}
void unblock(){
rc = ioctl(listen_sd, FIONBIO, (char *)&on);
if (rc < 0)
{
perror("ioctl() failed");
close(listen_sd);
exit(-1);
}
}
void sock_listen(){
rc = listen(listen_sd, 32);
if (rc < 0)
{
perror("listen() failed");
close(listen_sd);
exit(-1);
}
/*************************************************************/
/* Initialize the master fd_set
*/
/*************************************************************/
FD_ZERO(&master_set);
max_sd = listen_sd;
FD_SET(0,&master_set);
FD_SET(listen_sd, &master_set);
}
void conn_timeout(){
timeout.tv_sec = 3 * 60;
timeout.tv_usec = 0;
}
/*void client_listen(){
do
{
memcpy(&working_set, &master_set, sizeof(master_set));
printf("Waiting on select()...\n");
rc = select(max_sd + 1, &working_set, NULL, NULL, &timeout);
if (rc < 0)
{
perror(" select() failed");
break;
}
if (rc == 0)
{
printf(" select() timed out. End program.\n");
break;
}
desc_ready = rc;
*/
void start_listen(){
do
{
memcpy(&working_set, &master_set, sizeof(master_set));
printf("Waiting on select()...\n");
rc = select(max_sd + 1, &working_set, NULL, NULL, &timeout);
if (rc < 0)
{
perror(" select() failed");
break;
}
if (rc == 0)
{
printf(" select() timed out. End program.\n");
break;
}
desc_ready = rc;
for (i=0; i <= max_sd && desc_ready > 0; ++i)
{
if (FD_ISSET(i, &working_set))
{
desc_ready -= 1;
if (i == listen_sd)
{
printf(" Listening socket is readable\n");
do
{
addrlen = sizeof remoteaddr;
new_sd = accept(listen_sd, (struct sockaddr *)&remoteaddr,&addrlen);
if (new_sd < 0)
{
if (errno != EWOULDBLOCK)
{
perror(" accept() failed");
end_server = TRUE;
}
break;
}
printf(" New incoming connection - %d\n", new_sd);
printf("selectserver: new connection from %s on "
"socket %d\n",
inet_ntop(remoteaddr.ss_family,
get_in_addr((struct sockaddr*)&remoteaddr),
remoteIP, INET6_ADDRSTRLEN),
new_sd);
FD_SET(new_sd, &master_set);
if (new_sd > max_sd)
max_sd = new_sd;
} while (new_sd != -1);
}
else
{
printf(" Descriptor %d is readable\n", i);
close_conn = FALSE;
//do
//{
rc = read(i, buffer, sizeof(buffer)-1);
if (rc < 0)
{
if (errno != EWOULDBLOCK)
{
perror(" recv() failed");
close_conn = TRUE;
}
break;
}
if (rc == 0)
{
printf(" Connection closed\n");
close_conn = TRUE;
break;
}
len = rc;
printf(" %d bytes received\n", len);
if (i==0)i=1;
rc = write(i, buffer, len);
if (i==1)i=0;
if (rc < 0)
{
perror(" send() failed");
close_conn = TRUE;
break;
}
//} while (TRUE);
if (close_conn)
{
close(i);
FD_CLR(i, &master_set);
if (i == max_sd)
{
while (FD_ISSET(max_sd, &master_set) == FALSE)
max_sd -= 1;
}
}
} /* End of existing connection is readable */
} /* End of if (FD_ISSET(i, &working_set)) */
} /* End of loop through selectable descriptors */
end_server==TRUE;} while (end_server == FALSE);
}
void conn_close(){
for (i=0; i <= max_sd; ++i)
{
if (FD_ISSET(i, &master_set))
close(i);
}
}
void cl_socket() {
printf("Please enter the message: ");
do
{
memcpy(&working_set, &master_set, sizeof(master_set));
printf("Waiting on select()...\n");
rc = select(max_sd + 1, &working_set, NULL, NULL,NULL);
if (rc < 0)
{
perror(" select() failed");
break;
}
desc_ready = rc;
for (i=0; i <= max_sd && desc_ready > 0; ++i)
{
if (FD_ISSET(i, &working_set))
{
desc_ready -= 1;
printf(" Descriptor %d is readable\n", i);
close_conn = FALSE;
do
{
fgets(buffer,255,stdin);
rc = write(listen_sd, buffer,strlen(buffer));
if (rc < 0)
{
perror(" send() failed");
close_conn = TRUE;
}
rc = read(listen_sd, buffer, sizeof(buffer)-1);
if (rc < 0)
{
if (errno != EWOULDBLOCK)
{
perror(" recv() failed");
close_conn = TRUE;
}
}
if (rc == 0)
{
printf(" Connection closed\n");
close_conn = TRUE;
}
len = rc;
printf(" %d bytes received\n", len);
} while (TRUE);
if (close_conn)
{
close(i);
FD_CLR(i, &master_set);
if (i == max_sd)
{
while (FD_ISSET(max_sd, &master_set) == FALSE)
max_sd -= 1;
}
}
}//Working set
}//For loop
end_server==TRUE;} while (end_server == FALSE);
}
main(int argc,char * argv[])
{
mode=atoi(argv[1]);
PORT=atoi(argv[2]);
ip_host=(argv[3]);
servcl_memset();
if (mode ==1){
printf("In client mode\n");
if ((info = getaddrinfo(argv[3], argv[2], &hints, &loadinfo)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(info));
return 1;
}
cl_connect();
unblock();
conn_timeout();
cl_socket();
conn_close();
}
else {
printf("In server mode\n");
hints.ai_flags=AI_PASSIVE;
if ((info = getaddrinfo(NULL, argv[2], &hints, &loadinfo)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(info));
return 1;
}
init_socket();
unblock();
sock_listen();
conn_timeout();
start_listen();
conn_close();
}
}
/*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(const char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
close(sockfd);
return 0;
}