#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <stdio.h>#include <errno.h>#define BUFFER_SIZE 1024int main(int argc,char *argv[]){int from_fd,to_fd;int bytes_read,bytes_write;char buffer[BUFFER_SIZE];char *ptr;if(argc!=3){fprintf(stderr,"usage:%s fromfile tofile\n",argv[0]);exit(1);}if(from_fd=open(argv[1],O_RDONLY|O_NONBLOCK)==-1){fprintf(stderr,"open %s error!\n",argv[1]);exit(1);}memset(buffer, 0x00,sizeof(buffer));printf("read_start....\n");bytes_read=read(from_fd,buffer,BUFFER_SIZE);printf("bytes_read=[%d],buffer=[%s]\n", bytes_read,buffer);}這個是3.c文件，編譯 gcc -o 33 3.c；執(zhí)行 ./33 a.c(其中a.c中的內(nèi)容是'hello world')；但是程序執(zhí)行到最后的時候就阻塞掉了，不知道為啥? 各位大蝦幫幫忙if(argc!=3){fprintf(stderr,"usage:%s fromfile tofile\n",argv[0]);exit(1);}這段代碼去掉，不好意思。