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* poll.cc: Add bounds checking for file descriptors. Return POLLNVAL

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if fd is invalid. Return POLLERR for each valid fd if cygwin_select
        returned with error.
        include/sys/poll.h: Change POLLERR comment according to above change.
This commit is contained in:
Corinna Vinschen 2000-08-11 12:51:47 +00:00
parent 7b972f5da5
commit e82d75cc2b
3 changed files with 30 additions and 20 deletions
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7
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,10 @@
Fri Aug 11 14:47:00 2000 Corinna Vinschen <corinna@vinschen.de>
* poll.cc: Add bounds checking for file descriptors. Return POLLNVAL
if fd is invalid. Return POLLERR for each valid fd if cygwin_select
returned with error.
include/sys/poll.h: Change POLLERR comment according to above change.
Thu Aug 10 21:54:29 2000 Christopher Faylor <cgf@cygnus.com>
* syslog.cc (syslog): Use a less malloc-intensive method for allocating

2
winsup/cygwin/include/sys/poll.h
View File

@ -18,7 +18,7 @@ __BEGIN_DECLS
#define POLLIN 1 /* Set if data to read. */
#define POLLPRI 2 /* Set if urgent data to read. */
#define POLLOUT 4 /* Set if writing data wouldn't block. */
#define POLLERR 8 /* An error occured, not used by Cygwin. */
#define POLLERR 8 /* An error occured. */
#define POLLHUP 16 /* Shutdown or close happened. */
#define POLLNVAL 32 /* Invalid file descriptor. */

9
winsup/cygwin/poll.cc
View File

@ -25,7 +25,8 @@ poll (struct pollfd *fds, unsigned int nfds, int timeout)
FD_ZERO (&except_fds);
for (unsigned int i = 0; i < nfds; ++i)
if (!dtable.not_open (fds[i].fd))
if (fds[i].fd < FD_SETSIZE
&& !dtable.not_open (fds[i].fd))
{
FD_SET (fds[i].fd, &open_fds);
if (fds[i].events & POLLIN)
@ -41,13 +42,15 @@ poll (struct pollfd *fds, unsigned int nfds, int timeout)
int ret = cygwin_select (max_fd + 1, &read_fds, &write_fds, &except_fds,
timeout < 0 ? NULL : &tv);
if (ret >= 0)
for (unsigned int i = 0; i < nfds; ++i)
{
if (!FD_ISSET (fds[i].fd, &open_fds))
if (fds[i].fd >= FD_SETSIZE
|| !FD_ISSET (fds[i].fd, &open_fds))
fds[i].revents = POLLNVAL;
else if (dtable.not_open(fds[i].fd))
fds[i].revents = POLLHUP;
else if (ret < 0)
fds[i].revents = POLLERR;
else
{
fds[i].revents = 0;