1#include "stdio_impl.h"
 2
 3/* stdout.c will override this if linked */
 4static FILE *volatile dummy = 0;
 5weak_alias(dummy, __stdout_used);
 6weak_alias(dummy, __stderr_used);
 7
 8int fflush(FILE *f)
 9{
10	if (!f) {
11		int r = 0;
12		if (__stdout_used) r |= fflush(__stdout_used);
13		if (__stderr_used) r |= fflush(__stderr_used);
14
15		for (f=*__ofl_lock(); f; f=f->next) {
16			FLOCK(f);
17			if (f->wpos != f->wbase) r |= fflush(f);
18			FUNLOCK(f);
19		}
20		__ofl_unlock();
21
22		return r;
23	}
24
25	FLOCK(f);
26
27	/* If writing, flush output */
28	if (f->wpos != f->wbase) {
29		f->write(f, 0, 0);
30		if (!f->wpos) {
31			FUNLOCK(f);
32			return EOF;
33		}
34	}
35
36	/* If reading, sync position, per POSIX */
37	if (f->rpos != f->rend) f->seek(f, f->rpos-f->rend, SEEK_CUR);
38
39	/* Clear read and write modes */
40	f->wpos = f->wbase = f->wend = 0;
41	f->rpos = f->rend = 0;
42
43	FUNLOCK(f);
44	return 0;
45}
46
47weak_alias(fflush, fflush_unlocked);