我有一个复制程序,需要检查两个文件的i节点值,如果它们匹配,则该程序不应复制该文件(该文件不应复制到自身)。
我在这里有一些代码可以复制文件
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#define BUFFERSIZE 4096
#define COPYMODE 0644
void oops(char *, char *);
int main(int ac, char *av[])
{
int in_fd, out_fd, n_chars;
char buf[BUFFERSIZE];
int same = 1;
struct stat fileStat;
/* check args */
if ( ac != 3 ){
fprintf( stderr, "usage: %s source destination\n", *av);
exit(1);
}
/* open files */
if ( (in_fd=open(av[1], O_RDONLY)) == -1 )
oops("Cannot open ", av[1]);
if ( (out_fd=creat( av[2], COPYMODE)) == -1 )
oops( "Cannot creat", av[2]);
/* copy files */
while ( (n_chars = read(in_fd , buf, BUFFERSIZE)) > 0 )
if ( write( out_fd, buf, n_chars ) != n_chars )
oops("Write error to ", av[2]);
if ( n_chars == -1 )
oops("Read error from ", av[1]);
/* close files */
if ( close(in_fd) == -1 || close(out_fd) == -1 )
oops("Error closing files","");
}