I am calling poll() and the result is 2 while only one
of the revent fields is non-zero.
This is on FreeBSD 8.
Inspection of the code in sys_generic.c
and uipc_socket.c indicates that selrecord is being called
twice for poll sockets and that pollrescan is counting
the number of td->td_sel entries which are ready and
returning the result. I am concerned that there are 2
entries for the poll socket because of the comments
in selsetbits (sys_generic.c) which are:
* XXX Check for a duplicate set. This can occur because a
* socket calls selrecord() twice for each poll() call
* resulting in two selfds per real fd. selrescan() will
* call selsetbits twice as a result.
This check is not being done for poll().
Thanx,
jplevyak @ acm org
jplevyak @ apache org
of the revent fields is non-zero.
This is on FreeBSD 8.
Inspection of the code in sys_generic.c
and uipc_socket.c indicates that selrecord is being called
twice for poll sockets and that pollrescan is counting
the number of td->td_sel entries which are ready and
returning the result. I am concerned that there are 2
entries for the poll socket because of the comments
in selsetbits (sys_generic.c) which are:
* XXX Check for a duplicate set. This can occur because a
* socket calls selrecord() twice for each poll() call
* resulting in two selfds per real fd. selrescan() will
* call selsetbits twice as a result.
This check is not being done for poll().
Thanx,
jplevyak @ acm org
jplevyak @ apache org