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libc: more poll(3) wrapper fixes

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- POLLRDBAND is reported by select(2) as errorfd, not readfd;
- POLLERR is not the same as errorfd of select(2);
- flags that are not requested should not be returned.

Change-Id: I9cb3c2c260ead5a2852a2fbbc10280c2b5b0dff9
This commit is contained in:
David van Moolenbroek 2017-02-15 19:13:43 +00:00
parent 68804c208e
commit 44fdeb7a62
1 changed files with 8 additions and 6 deletions
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14
minix/lib/libc/sys/poll.c
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@ -67,11 +67,12 @@ poll(struct pollfd *p, nfds_t nfds, int timout)
if (p[i].fd > highfd)
highfd = p[i].fd;
if (p[i].events & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI))
if (p[i].events & (POLLIN|POLLRDNORM))
FD_SET(p[i].fd, &rd);
if (p[i].events & (POLLOUT|POLLWRNORM|POLLWRBAND))
FD_SET(p[i].fd, &wr);
FD_SET(p[i].fd, &except);
if (p[i].events & (POLLRDBAND|POLLPRI))
FD_SET(p[i].fd, &except);
}
tv.tv_sec = timout / 1000;
@ -87,12 +88,13 @@ poll(struct pollfd *p, nfds_t nfds, int timout)
if (p[i].fd < 0)
continue;
if (FD_ISSET(p[i].fd, &rd))
p[i].revents |= POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI;
p[i].revents |= p[i].events & (POLLIN|POLLRDNORM);
if (FD_ISSET(p[i].fd, &wr))
p[i].revents |= POLLOUT|POLLWRNORM|POLLWRBAND;
p[i].revents |=
p[i].events & (POLLOUT|POLLWRNORM|POLLWRBAND);
if (FD_ISSET(p[i].fd, &except))
p[i].revents |= POLLERR;
/* XXX: POLLHUP/POLLNVAL? */
p[i].revents |= p[i].events & (POLLRDBAND|POLLPRI);
/* XXX: POLLERR/POLLHUP/POLLNVAL? */
if (p[i].revents != 0)
rval++;
}