#include "stdio_impl.h"
-static int __fflush_unlocked(FILE *f)
-{
- /* If writing, flush output. */
- if (f->wpos > f->buf && __oflow(f)) return -1;
-
- /* If reading, sync position, per POSIX */
- if (f->rpos < f->rend) f->seek(f, f->rpos-f->rend, SEEK_CUR);
- f->rpos = f->rend;
-
- /* Hook for special behavior on flush */
- if (f->flush) f->flush(f);
-
- return (f->flags & F_ERR) ? EOF : 0;
-}
-
/* stdout.c will override this if linked */
-static FILE *const __dummy = 0;
-weak_alias(__dummy, __stdout_to_flush);
+static FILE *volatile dummy = 0;
+weak_alias(dummy, __stdout_used);
+weak_alias(dummy, __stderr_used);
int fflush(FILE *f)
{
- int r;
- FILE *next;
+ if (!f) {
+ int r = 0;
+ if (__stdout_used) r |= fflush(__stdout_used);
+ if (__stderr_used) r |= fflush(__stderr_used);
+
+ for (f=*__ofl_lock(); f; f=f->next) {
+ FLOCK(f);
+ if (f->wpos != f->wbase) r |= fflush(f);
+ FUNLOCK(f);
+ }
+ __ofl_unlock();
- if (f) {
- FLOCK(f);
- r = __fflush_unlocked(f);
- FUNLOCK(f);
return r;
}
- r = __stdout_to_flush ? fflush(__stdout_to_flush) : 0;
+ FLOCK(f);
- OFLLOCK();
- for (f=ofl_head; f; f=next) {
- FLOCK(f);
- OFLUNLOCK();
- r |= __fflush_unlocked(f);
- OFLLOCK();
- next = f->next;
- FUNLOCK(f);
+ /* If writing, flush output */
+ if (f->wpos != f->wbase) {
+ f->write(f, 0, 0);
+ if (!f->wpos) {
+ FUNLOCK(f);
+ return EOF;
+ }
}
- OFLUNLOCK();
-
- return r;
+
+ /* 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_unlocked, fflush_unlocked);
+weak_alias(fflush, fflush_unlocked);