poll implemenation on linux vs poll implementation on solaris
c, linux, solaris
Solution
Both, Linux and Solaris, used to fail to set POLLIN for EOF on some types of files, especially pipes. A common workaround was checking for POLLHUP and POLLIN together. As far as I know, the Linux core developers kept it that way (probably intended), whilst the Solaris fellows changed that behavior to use POLLIN POLLEOF.
However, this should be no issue for your application: In order to increase an application's portability, one would always check for both flags in the bit-mask.
Cheers!
Problem
During debugging our application in linux enviroment we can observe that some events - `POLLHUP|POLLIN` occur only on linux. Our application uses unix sockets. When we do: ``` ret = poll(xpoll->pfd, xpoll->pfd_count, xpoll_timeout); ``` strace shows: ``` poll([{fd=4, events=POLLIN|POLLPRI|POLLERR|POLLHUP}, {fd=6, events=POLLIN|POLLPRI|POLLERR|POLLHUP}, {fd=7, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 3, 16) = 1 ([{fd=7, revents=POLLIN|POLLHUP}]) ``` That situation never occurs in solaris (same application): struss shows: ``` 2463/3: fd=569 ev=POLLIN|POLLPRI|POLLERR|POLLHUP rev=0 2463/3: fd=639 ev=POLLIN|POLLPRI|POLLERR|POLLHUP rev=0 2463/3: fd=631 ev=POLLIN|POLLPRI|POLLERR|POLLHUP rev=POLLIN 2463/3: fd=1160 ev=POLLIN|POLLPRI|POLLERR|POLLHUP rev=0 2463/3: fd=400 ev=POLLIN|POLLPRI|POLLERR|POLLHUP rev=0 ``` Can You please explain me what is the difference between poll in solaris and poll in liunx ? Thx in advance for all answers.