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/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
*
* GNU Library General Public License (LGPL) version 2 or later.
*
* Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
*/
#include "_stdio.h"
#include <stdio_ext.h>
libc_hidden_proto(__fsetlocking)
/* Not threadsafe. */
/* Notes:
* When setting the locking mode, glibc returns the previous setting.
* glibc treats invalid locking_mode args as FSETLOCKING_INTERNAL.
*/
int __fsetlocking(FILE *stream, int locking_mode)
{
#ifdef __UCLIBC_HAS_THREADS__
int current = 1 + (stream->__user_locking & 1);
/* Check constant assumptions. We can't test at build time
* since these are enums. */
assert((FSETLOCKING_QUERY == 0) && (FSETLOCKING_INTERNAL == 1)
&& (FSETLOCKING_BYCALLER == 2));
__STDIO_STREAM_VALIDATE(stream);
assert(((unsigned int) locking_mode) <= 2);
if (locking_mode != FSETLOCKING_QUERY) {
stream->__user_locking = ((locking_mode == FSETLOCKING_BYCALLER)
? 1
: _stdio_user_locking); /* 0 or 2 */
__STDIO_STREAM_VALIDATE(stream);
}
return current;
#else
__STDIO_STREAM_VALIDATE(stream);
assert(((unsigned int) locking_mode) <= 2);
return FSETLOCKING_INTERNAL;
#endif
}
libc_hidden_def(__fsetlocking)
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