在Linux下复制文件出错

[jdf1025]

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <string.h>
#include <fcntl.h>
#include "ourhdr.h"

#ifndef MAP_FILE
#define MAP_FILE 0
#endif

int main(int argc, char *argv[])
{
int fdin, fdout;
char *src, *dst;
struct stat statbuf;

if(argc!=3)
{
err_quit("usage : a.out <fromfile><tofile>");
}
if((fdin=open(argv[1], O_RDONLY))<0)
{
err_sys("can't open %s for reading", argv[1]);
}
if((fdout=open(argv[2], O_RDWR|O_CREAT|O_TRUNC, FILE_MODE))<0)
{
err_sys("can't creat %s for writing",argv[2]);
}
if(fstat(fdin, &statbuf)<0)
{
err_sys("fstat error");
}
if(lseek(fdout, statbuf.st_size-1, SEEK_SET)==-1)
{
err_sys("lseek error");
}
if(write(fdout, "", 1)!=1)
{
err_sys("write error");
}
if((src=mmap(0,statbuf.st_size, PROT_READ,
MAP_FILE|MAP_SHARED, fdin, 0))==(caddr_t)-1)
{
err_sys("mmap error for input");
}

if((dst=mmap(0, statbuf.st_size, PROT_READ|PROT_WRITE,
MAP_FILE|MAP_SHARED, fdout, 0))==(caddr_t)-1)
{
err_sys("mmap error for output");
}

memcpy(dst, src, statbuf.st_size);

exit(0);
}

在dst=mmap这个地方有问题，希望 解决，谢谢！

[南气子水]

if((dst=mmap(0, statbuf.st_size, PROT_READ|PROT_WRITE,
MAP_FILE|MAP_SHARED, fdout, 0))==(caddr_t)-1)

[qq120848369]

没看出错, 哪里错了?

[proorck6]

我喜欢用system函数，调用shell完成这个功能。