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libc: honor poll() event flags POLLRDNORM etc. 

Fixes empty read file-descriptor sets in fetchurl_lwip/lxip.

Issue #3499
This commit is contained in:
Christian Helmuth 2019-10-02 16:25:23 +02:00
parent 97df705e53
commit 291587f545
1 changed files with 5 additions and 9 deletions
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14
repos/libports/src/lib/libc/poll.cc
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@ -1,6 +1,7 @@
/*
* \brief poll() implementation
* \author Josef Soentgen
* \author Christian Helmuth
* \author Emery Hemingway
* \date 2012-07-12
*/
@ -56,8 +57,7 @@ poll(struct pollfd fds[], nfds_t nfds, int timeout)
for (i = 0; i < nfds; i++) {
fd = fds[i].fd;
if (fd >= (int)FD_SETSIZE) {
/*errno = EINVAL;*/
return -1;
return Libc::Errno(EINVAL);
}
maxfd = MAX(maxfd, fd);
}
@ -72,11 +72,11 @@ poll(struct pollfd fds[], nfds_t nfds, int timeout)
fd = fds[i].fd;
if (fd == -1)
continue;
if (fds[i].events & POLLIN) {
if (fds[i].events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
FD_SET(fd, &readfds);
FD_SET(fd, &exceptfds);
}
if (fds[i].events & POLLOUT) {
if (fds[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
FD_SET(fd, &writefds);
FD_SET(fd, &exceptfds);
}
@ -89,7 +89,7 @@ poll(struct pollfd fds[], nfds_t nfds, int timeout)
tvp = &tv;
}
ret = select(maxfd + 1, &readfds, &writefds, &exceptfds, tvp);
/*saved_errno = errno;*/
/* scan through select results and set poll() flags */
for (i = 0; i < nfds; i++) {
fd = fds[i].fd;
@ -107,10 +107,6 @@ poll(struct pollfd fds[], nfds_t nfds, int timeout)
}
}
/*
if (ret == -1)
errno = saved_errno;
*/
return ret;
}