1 /* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
2  *
3  * GNU Library General Public License (LGPL) version 2 or later.
4  *
5  * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
6  */
7 
8 #include "_stdio.h"
9 #include <stdio_ext.h>
10 
11 
12 /* Not threadsafe. */
13 
14 /* Notes:
15  *   When setting the locking mode, glibc returns the previous setting.
16  *   glibc treats invalid locking_mode args as FSETLOCKING_INTERNAL.
17  */
18 
__fsetlocking(FILE * stream,int locking_mode)19 int __fsetlocking(FILE *stream, int locking_mode)
20 {
21 #ifdef __UCLIBC_HAS_THREADS__
22 	int current = 1 + (stream->__user_locking & 1);
23 
24 	/* Check constant assumptions.  We can't test at build time
25 	 * since these are enums. */
26 	assert((FSETLOCKING_QUERY == 0) && (FSETLOCKING_INTERNAL == 1)
27 		   && (FSETLOCKING_BYCALLER == 2));
28 
29 	__STDIO_STREAM_VALIDATE(stream);
30 	assert(((unsigned int) locking_mode) <= 2);
31 
32 	if (locking_mode != FSETLOCKING_QUERY) {
33 		stream->__user_locking = ((locking_mode == FSETLOCKING_BYCALLER)
34 								  ? 1
35 								  : _stdio_user_locking); /* 0 or 2 */
36 		__STDIO_STREAM_VALIDATE(stream);
37 	}
38 
39 	return current;
40 #else
41 	__STDIO_STREAM_VALIDATE(stream);
42 	assert(((unsigned int) locking_mode) <= 2);
43 
44 	return FSETLOCKING_INTERNAL;
45 #endif
46 }
47 libc_hidden_def(__fsetlocking)
48