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| | #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 */
WEAK_PROVIDE_DUMMY;
_Readonly_alias FILE *const __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;
OFLLOCK();
for (f=libc.ofl_head; f; f=f->next) {
FLOCK(f);
if (f->wpos > f->wbase) r |= __fflush_unlocked(f);
FUNLOCK(f);
}
OFLUNLOCK();
return r;
}
weak_alias(__fflush_unlocked, fflush_unlocked);
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