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2004-09-17
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#include
#include
#include
#include
#include
#include
#define BUFFER_SIZE 1048576
int 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\a",argv[0]);
exit(1);
}
if((from_fd=open(argv[1],O_RDONLY))==-1)
{
fprintf(stderr,"%s:%s:cannot open for read:%s\n",argv[0],argv[1]);
return 1;
}
if((to_fd=open(argv[2],O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR))==-1)
{
fprintf(stderr,"%s:%s:cannot open for write:%s\n",argv[1],argv[2]);
return 1;
}
int start=time((time_t *)NULL);
printf("time start:%d\n",start);
while(bytes_read=read(from_fd,buffer,BUFFER_SIZE))
{
if((bytes_read==-1)&&(errno!=EINTR)) break;
else if(bytes_read>0)
{
ptr=buffer;
while(bytes_write=write(to_fd,ptr,bytes_read))
{
if((bytes_write==-1)&&(errno!=EINTR))break;
else if(bytes_write==bytes_read) break;
else if(bytes_write>0)
{
ptr+=bytes_write;
bytes_read-=bytes_write;
}
}
if(bytes_write==-1)break;
}
}
int end=time((time_t *)NULL);
printf("time end:%d\n",end);
int get_time;
get_time=end-start;
printf("take time:%ds\n",get_time);
//out time
//closed
}
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