mailing list of musl libc

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 #include <stdio_impl.h>

int __toread(FILE *f)
{
	f->mode |= f->mode-1;
	if (f->wpos > f->buf) f->write(f, 0, 0);
	f->wpos = f->wbase = f->wend = 0;
	if (f->flags & (F_EOF|F_NORD)) {
		if (f->flags & F_NORD) f->flags |= F_ERR;
		return EOF;
	}
	f->rpos = f->rend = f->buf;
	return 0;
}

WEAK_PROVIDE_DUMMY;
_Readonly_alias int const __towrite_used;

void __stdio_exit(void);

void __seek_on_exit()
{
	if (!__towrite_used) __stdio_exit();
}