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it unlocks many cool features!
- #include "stdio_impl.h"
- static int __fflush_unlocked(FILE *f)
- {
- /* If writing, flush output */
- if (f->wpos > f->wbase) {
- f->write(f, 0, 0);
- if (!f->wpos) return EOF;
- }
- /* If reading, sync position, per POSIX */
- if (f->rpos < f->rend) f->seek(f, f->rpos-f->rend, SEEK_CUR);
- /* Clear read and write modes */
- f->wpos = f->wbase = f->wend = 0;
- f->rpos = f->rend = 0;
- return 0;
- }
- /* stdout.c will override this if linked */
- static FILE *volatile dummy = 0;
- weak_alias(dummy, __stdout_used);
- int fflush(FILE *f)
- {
- int r;
- if (f) {
- FLOCK(f);
- r = __fflush_unlocked(f);
- FUNLOCK(f);
- return r;
- }
- r = __stdout_used ? fflush(__stdout_used) : 0;
- for (f=*__ofl_lock(); f; f=f->next) {
- FLOCK(f);
- if (f->wpos > f->wbase) r |= __fflush_unlocked(f);
- FUNLOCK(f);
- }
- __ofl_unlock();
- return r;
- }
- weak_alias(__fflush_unlocked, fflush_unlocked);
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