FILE *
_freopen64_r (struct _reent *ptr,
const char *file,
const char *mode,
register FILE *fp)
{
register int f;
int flags, oflags, oflags2;
int e = 0;
CHECK_INIT (ptr, fp);
/* We can't use the _newlib_flockfile_XXX macros here due to the
interlocked locking with the sfp_lock. */
#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
int __oldcancel;
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &__oldcancel);
#endif
oflags2 = fp->_flags2;
if (!(oflags2 & __SNLK))
_flockfile (fp);
if ((flags = __sflags (ptr, mode, &oflags)) == 0)
{
if (!(oflags2 & __SNLK))
_funlockfile (fp);
#ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT
pthread_setcancelstate (__oldcancel, &__oldcancel);
#endif
_fclose_r (ptr, fp);
return NULL;
}
/*
* Remember whether the stream was open to begin with, and
* which file descriptor (if any) was associated with it.
* If it was attached to a descriptor, defer closing it,
* so that, e.g., freopen("/dev/stdin", "r", stdin) works.
* This is unnecessary if it was not a Unix file.
*/
if (fp->_flags == 0)
fp->_flags = __SEOF; /* hold on to it */
else
{
if (fp->_flags & __SWR)
_fflush_r (ptr, fp);
/*
* If close is NULL, closing is a no-op, hence pointless.
* If file is NULL, the file should not be closed.
*/
if (fp->_close != NULL && file != NULL)
fp->_close (ptr, fp->_cookie);
}
/*
* Now get a new descriptor to refer to the new file, or reuse the
* existing file descriptor if file is NULL.
*/
if (file != NULL)
{
f = _open64_r (ptr, (char *) file, oflags, 0666);
e = __errno_r(ptr);
}
else
{
#ifdef HAVE_FCNTL
int oldflags;
/*
* Reuse the file descriptor, but only if the new access mode is
* equal or less permissive than the old. F_SETFL correctly
* ignores creation flags.
*/
f = fp->_file;
if ((oldflags = _fcntl_r (ptr, f, F_GETFL, 0)) == -1
|| ! ((oldflags & O_ACCMODE) == O_RDWR
|| ((oldflags ^ oflags) & O_ACCMODE) == 0)
|| _fcntl_r (ptr, f, F_SETFL, oflags) == -1)
f = -1;
#else
/* We cannot modify without fcntl support. */
f = -1;
#endif
#ifdef __SCLE
/*
* F_SETFL doesn't change textmode. Don't mess with modes of ttys.
*/
if (0 <= f && ! isatty (f)
&& setmode (f, oflags & (O_BINARY | O_TEXT)) == -1)
f = -1;
#endif
if (f < 0)
{
e = EBADF;
if (fp->_close != NULL)
fp->_close (ptr, fp->_cookie);
}
}
/*
* Finish closing fp. Even if the open succeeded above,
* we cannot keep fp->_base: it may be the wrong size.
* This loses the effect of any setbuffer calls,
* but stdio has always done this before.
*/
if (fp->_flags & __SMBF)
_free_r (ptr, (char *) fp->_bf._base);
fp->_w = 0;
fp->_r = 0;
fp->_p = NULL;
fp->_bf._base = NULL;
fp->_bf._size = 0;
fp->_lbfsize = 0;
if (HASUB (fp))
FREEUB (ptr, fp);
fp->_ub._size = 0;
if (HASLB (fp))
FREELB (ptr, fp);
fp->_lb._size = 0;
fp->_flags &= ~__SORD;
fp->_flags2 &= ~__SWID;
memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
if (f < 0)
{ /* did not get it after all */
__sfp_lock_acquire ();
fp->_flags = 0; /* set it free */
__errno_r(ptr) = e; /* restore in case _close clobbered */
if (!(oflags2 & __SNLK))
_funlockfile (fp);
#ifndef __SINGLE_THREAD__
__lock_close_recursive (fp->_lock);
#endif
__sfp_lock_release ();
#if !defined (__SINGLE_THREAD__) && defined (_POSIX_THREADS)
pthread_setcancelstate (__oldcancel, &__oldcancel);
#endif
return NULL;
}
fp->_flags = flags;
fp->_file = f;
fp->_cookie = (void *) fp;
fp->_read = __sread;
fp->_write = __swrite64;
fp->_seek = __sseek;
fp->_seek64 = __sseek64;
fp->_close = __sclose;
#ifdef __SCLE
if (__stextmode(fp->_file))
fp->_flags |= __SCLE;
#endif
fp->_flags |= __SL64;
if (!(oflags2 & __SNLK))
_funlockfile (fp);
#if !defined (__SINGLE_THREAD__) && defined (_POSIX_THREADS)
pthread_setcancelstate (__oldcancel, &__oldcancel);
#endif
return fp;
}
EXPORT_C
void funlockfile(FILE *fp)
{
_funlockfile(fp);
}
