int file_dup(FAR struct file *filep, int minfd)
{
int fd2;
/* Verify that fd is a valid, open file descriptor */
if (!DUP_ISOPEN(filep))
{
return -EBADF;
}
/* Increment the reference count on the contained inode */
inode_addref(filep->f_inode);
/* Then allocate a new file descriptor for the inode */
fd2 = files_allocate(filep->f_inode, filep->f_oflags, filep->f_pos, minfd);
if (fd2 < 0)
{
inode_release(filep->f_inode);
return -EMFILE;
}
return fd2;
}
int dup2(int fildes1, int fildes2)
#endif
{
FAR struct filelist *list;
/* Get the thread-specific file list */
list = sched_getfiles();
if (!list)
{
set_errno(EMFILE);
return ERROR;
}
/* Verify that fildes is a valid, open file descriptor */
if (!DUP_ISOPEN(fildes1, list))
{
set_errno(EBADF);
return ERROR;
}
/* Handle a special case */
if (fildes1 == fildes2)
{
return fildes1;
}
/* Verify fildes2 */
if ((unsigned int)fildes2 >= CONFIG_NFILE_DESCRIPTORS)
{
set_errno(EBADF);
return ERROR;
}
return files_dup(&list->fl_files[fildes1], &list->fl_files[fildes2]);
}