Linux下利用sendfile函数传输文件

#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <assert.h>#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <sys/sendfile.h>int main(){const char *ip="127.0.0.1";int port=12345;const char *file_name="main.c";int filefd=open(file_name,O_RDONLY);assert(filefd>0);struct stat stat_buf;fstat(filefd,&stat_buf);struct sockaddr_in address;bzero(&address,sizeof(address));address.sin_family=AF_INET;inet_pton(AF_INET,ip,&address.sin_addr);address.sin_port=htons(port);int sock=socket(PF_INET,SOCK_STREAM,0);assert(sock>0);int ret=bind(sock,(struct sockaddr *)&address,sizeof(address));assert(ret!=-1);ret=listen(sock,5);struct sockaddr_in client;socklen_t client_addrlength=sizeof(client);int connfd=accept(sock,(struct sockaddr *)&client,&client_addrlength);if(connfd<0){printf("Errorno is:%d",errno);}else{sendfile(connfd,filefd,NULL,stat_buf.st_size);close(connfd);}close(sock);return 0;}

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