Linux文件编程demo7文件操作小应用之cp命令.c

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

int main(int argc,char **argv)
{
	int fdSrc;
	int fdDes;
	
	char *readBuf = NULL;
	
	if(argc != 3){
		printf("programe error\n");
        exit(-1);		
	}
	fdSrc = open(argv[1],O_RDWR);
	int size = lseek(fdSrc,0,SEEK_END);
	lseek(fdSrc,0,SEEK_SET);
	readBuf = (char *)malloc(sizeof(char)*size+8);
	
	int n_read = read(fdSrc,readBuf,size);
	
	fdDes = open(argv[2],O_RDWR|O_CREAT|O_TRUNC,0600);
    int n_write = write(fdDes,readBuf,strlen(readBuf));
	
	close(fdSrc);
	close(fdDes);
	return 0;
} ```