int
__fflush_unlocked (_IO_FILE *fp)
{
if (fp == NULL)
return _IO_flush_all ();
else
{
CHECK_FILE (fp, EOF);
return _IO_SYNC (fp) ? EOF : 0;
}
}
_IO_FILE *
_IO_default_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len)
{
if (_IO_SYNC (fp) == EOF)
return NULL;
if (p == NULL || len == 0)
{
fp->_flags |= _IO_UNBUFFERED;
_IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0);
}
else
{
fp->_flags &= ~_IO_UNBUFFERED;
_IO_setb (fp, p, p+len, 0);
}
fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = 0;
fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_read_end = 0;
return fp;
}
FILE *
freopen64 (const char *filename, const char *mode, FILE *fp)
{
FILE *result = NULL;
char fdfilename[FD_TO_FILENAME_SIZE];
CHECK_FILE (fp, NULL);
_IO_acquire_lock (fp);
/* First flush the stream (failure should be ignored). */
_IO_SYNC (fp);
if (!(fp->_flags & _IO_IS_FILEBUF))
goto end;
int fd = _IO_fileno (fp);
const char *gfilename
= filename != NULL ? filename : fd_to_filename (fd, fdfilename);
fp->_flags2 |= _IO_FLAGS2_NOCLOSE;
_IO_file_close_it (fp);
_IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps;
if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL)
fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;
result = _IO_file_fopen (fp, gfilename, mode, 0);
fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE;
if (result != NULL)
result = __fopen_maybe_mmap (result);
if (result != NULL)
{
/* unbound stream orientation */
result->_mode = 0;
if (fd != -1 && _IO_fileno (result) != fd)
{
/* At this point we have both file descriptors already allocated,
so __dup3 will not fail with EBADF, EINVAL, or EMFILE. But
we still need to check for EINVAL and, due Linux internal
implementation, EBUSY. It is because on how it internally opens
the file by splitting the buffer allocation operation and VFS
opening (a dup operation may run when a file is still pending
'install' on VFS). */
if (__dup3 (_IO_fileno (result), fd,
(result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0
? O_CLOEXEC : 0) == -1)
{
_IO_file_close_it (result);
result = NULL;
goto end;
}
__close (_IO_fileno (result));
_IO_fileno (result) = fd;
}
}
else if (fd != -1)
__close (fd);
end:
_IO_release_lock (fp);
return result;
}
