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#include "stdio_impl.h"
/* stdout.c will override this if linked */
static FILE *volatile dummy = 0;
weak_alias(dummy, __stdout_used);
int fflush(FILE *f)
{
if (!f) {
int r = __stdout_used ? fflush(__stdout_used) : 0;
for (f=*__ofl_lock(); f; f=f->next) {
FLOCK(f);
if (f->wpos != f->wbase) r |= fflush(f);
FUNLOCK(f);
}
__ofl_unlock();
return r;
}
FLOCK(f);
/* If writing, flush output */
if (f->wpos != f->wbase) {
f->write(f, 0, 0);
if (!f->wpos) {
FUNLOCK(f);
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;
FUNLOCK(f);
return 0;
}
weak_alias(fflush, fflush_unlocked);
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