1 #include "stdio_impl.h"
2
3 /* stdout.c will override this if linked */
4 static FILE *volatile dummy = 0;
5 weak_alias(dummy, __stdout_used);
6 weak_alias(dummy, __stderr_used);
7
fflush(FILE * f)8 int 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
47 weak_alias(fflush, fflush_unlocked);
48