tech-kern archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: Adding pulse support to gpio(4), gpioctl(8)

>> Well, you need to open it first, before you can to ioctl, and if
>> only one process can open it, only one process can ioctl it, right?
> Wrong.


> Multiple threads can ioctl and nobody prevents one from having a
> single process with multiple threads (pthreads, if you like).

Not only that, but even without threading, there are at least two ways
I can think of offhand that a file descriptor, once opened, can end up
in multiple processes' open file tables: fork() and SCM_RIGHTS.  (There
are probably others, too.)

/~\ The ASCII                             Mouse
\ / Ribbon Campaign
 X  Against HTML      
/ \ Email!           7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B

Home | Main Index | Thread Index | Old Index