文件上传，多进程并发链接，多线程并发链接

文件上传代码
main.c

#include"head.h"
#define SER_IP "192.168.8.101"
int main(int argc, const char *argv[])
{
	int ucfd =socket(AF_INET,SOCK_DGRAM,0);
	if(ucfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	struct sockaddr_in ucin;
	ucin.sin_family = AF_INET;
	ucin.sin_port = htons(69);
	ucin.sin_addr.s_addr = inet_addr(SER_IP);
	struct sockaddr_in usin;
	socklen_t rlen=sizeof(usin),slen=sizeof(ucin);
	char buf[516];
	short *pa=(short*)buf;
	*pa=htons(2);
//	printf("pa=%d\n",*pa);
	char *pb=buf+2;
	strcpy(pb,argv[1]);
	char *pc=buf+2+strlen(pb)+1;
	strcpy(pc,"octet");
	size_t buf_len =2+strlen(pb)+1+strlen(pc)+1;
	sendto(ucfd,buf,buf_len,0,(struct sockaddr*)&ucin,slen);
	char back_codes[4];
	recvfrom(ucfd,back_codes,sizeof(back_codes),0,(struct sockaddr*)&usin,&rlen);
	if(connect(ucfd,(struct sockaddr*)&usin,rlen)<0)
	{
		ERR_MSG("connect");
		return -1;
	}
	short make_code,c_code;
	make_code = ntohs(*(short*)back_codes);
	c_code =ntohs(*(short*)(back_codes+2));	int fd = open(argv[1],O_RDONLY);
	size_t res;
	int i=0;
	while(1)
	{		
		bzero(back_codes,4);
		bzero(buf,sizeof(buf));
		short *bc=(short*)buf;
		*bc = htons(3);
		short *bb=(short*)(buf+2);
		i++;
		*bb =htons(i);
		res = read(fd,buf+4,512);
		send(ucfd,buf,sizeof(buf),0);
		recv(ucfd,back_codes,sizeof(back_codes),0);
		make_code = ntohs(*(short*)back_codes);
		c_code =ntohs(*(short*)(back_codes+2));
		if(make_code!=4||c_code!=i){
			printf("error\n");
			break;
		}
		if(res<512)
		{
			printf("success\n");
			break;
		}
	}
	printf("%d\n",i);
	close(fd);
	close(ucfd);
	return 0;
}

并发进程代码
main.c

#include"head.h"
void call_back(int argc){
	while (waitpid(-1,NULL,WNOHANG)>0);
}
void myson(int);
int main(int argc, const char *argv[])
{
	signal(17,call_back);
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0){
		ERR_MSG("socket");
		return -1;
	}
	int reuse=1;
	if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	struct sockaddr_in sina;
	sina.sin_family = AF_INET;
	sina.sin_port  =htons(PORT);
	sina.sin_addr.s_addr = inet_addr(IP_ADDR);
	if(bind(sfd,(struct sockaddr*)&sina,sizeof(sina))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("success:%d\n",__LINE__);
	if(listen(sfd,99)<0)
	{
		perror("listen");
		return -1;
	}
	struct sockaddr_in csin;
	socklen_t len = sizeof(csin);
	while (1)
	{
		int newfd=accept(sfd,(struct sockaddr *)&csin,&len);
		if(0==fork())
		{
			close(sfd);
			myson(newfd);
			exit(0);
		}
		close(newfd);
	}
	if(close(sfd)<0)
	{
		perror("close");
		return -1;
	}
	return 0;
}
void myson(int newfd){
	char buf[128]="";
	ssize_t res,resa;
	while (1)
	{
		bzero(buf,sizeof(buf));
		res=recv(newfd,buf,sizeof(buf),0);
		if(res>0){
			printf("%s\n",buf);
			resa = send(newfd,buf,sizeof(buf),0);
			if(resa<0)
			{
				printf("send erro\n");
				break;
			}else if(resa==0)
			{
				printf("close\n");
				break;
			}
		}else if(res<0)
		{
			ERR_MSG("recv");
			break;
		}else{
			printf("dui duan guan bi\n");
			break;
		}
	}
	if(close(newfd)<0)
	{
		perror("newfd");
	}
}

并发线程代码
main.c

#include"head.h"
void* myson(void*);
int main(int argc, const char *argv[])
{
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0){
		ERR_MSG("socket");
		return -1;
	}
	int reuse=1;
	if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	struct sockaddr_in sina;
	sina.sin_family = AF_INET;
	sina.sin_port  =htons(PORT);
	sina.sin_addr.s_addr = inet_addr(IP_ADDR);
	if(bind(sfd,(struct sockaddr*)&sina,sizeof(sina))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("success:%d\n",__LINE__);
	if(listen(sfd,99)<0)
	{
		perror("listen");
		return -1;
	}
	struct sockaddr_in csin;
	socklen_t len = sizeof(csin);
	int newfd;
	pthread_t pid;
	while(1){
		newfd=accept(sfd,(struct sockaddr *)&csin,&len);
		if(pthread_create(&pid,NULL,myson,&newfd)<0)
		{
			perror("create");
			continue;
		}
		pthread_detach(pid);
	}
	if(close(sfd)<0)
	{
		perror("close");
		return -1;
	}
	return 0;
}
void* myson(void*agrc){
	int newfd=*(int*)agrc;
	char buf[128]="";
	size_t res,resa;
	while (1)
	{
		bzero(buf,sizeof(buf));
		res=recvfrom(newfd,buf,sizeof(buf),0,NULL,NULL);
		if(res>0){
			printf("%s\n",buf);
			resa = send(newfd,buf,sizeof(buf),0);
			if(resa<0)
			{
				printf("send erro\n");
				break;
			}else if(resa==0)
			{
				printf("close\n");
				break;
			}
		}else if(res<0)
		{
			ERR_MSG("recv");
			break;
		}else{
			printf("dui duan guan bi\n");
			break;
		}
	}
	if(close(newfd)<0)
	{
		perror("newfd");
	}
	pthread_exit(NULL);
}