#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
#define MYPORT 80
#define BACKLOG 10
void sigchld_handler(int s)
{
while(wait(NULL) >0)
}
int main(void)
{
int sockfd, new_fd
struct sockaddr_in my_addr
struct sockaddr_in their_addr
int sin_size
struct sigaction sa
int yes=1
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket")
exit(1)
}
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
perror("setsockopt")
exit(1)
}
my_addr.sin_family = AF_INET
my_addr.sin_port = htons(MYPORT)
my_addr.sin_addr.s_addr = INADDR_ANY
memset(&(my_addr.sin_zero), '\0', 8 )
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
perror("bind")
exit(1)
}
if (listen(sockfd, BACKLOG) == -1) {
perror("listen")
exit(1)
}
sigemptyset(&sa.sa_mask)
sa.sa_flags = SA_RESTART
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction")
exit(1)
}
while(1) { // main accept() loop
sin_size = sizeof(struct sockaddr_in)
if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
perror("accept")
continue
}
printf("server: got connection from %s\n",inet_ntoa(their_addr.sin_addr))
if (!fork()) { // this is the child process
close(sockfd)// child doesn't need the listener
if (send(new_fd, "Hello, world!\n", 14, 0) == -1)
perror("send")
close(new_fd)
exit(0)
}
close(new_fd)
}
return 0
}
用c语言实现文件自动下载并且解压1.自动下载 http://abc.com/test.rar 也可以下载FTP://abc.com/test.rar2.下载完成后自动解压到本路径下相同的文件夹里面，如：test.rar就是test文件夹3.如果test文件夹已经存在并且里面有内容就直接覆盖4.软件运行的时候提示用户输入存储路径5.下载过程中显示下载进度6.一个好的编程会在适当的地方加上适当的注释以上功能我已经用wget+winrar的做成批处理可以运行了，但是希望用C语言来实现先送50分，如果实现了在加送50分，不希望吧分数留给系统希望采纳
