| /* 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> |
| |
| |
| /* 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) |