On 12/27/2010 07:16 PM, David Kuehling wrote: >>>>>> "Xiangfu" == Xiangfu Liu <[email protected]> writes: > >> On 12/27/2010 05:30 PM, David Kuehling wrote: >>>>> one question about ioctl(1, TIOCSCTTY, (char *)1); the first "1" >>>> means > /dev/tty1, right?? what is the meaning of "(char *)1"? >>> It means stdout (the file descriptor, not the stream). As Alan >>> pointed out, we could (and should) replace this with constant >>> STDOUT_FILENO as defined in unistd.h >>> > >> then I have another question. :) why you pass "STDOUT" to "ioctl(1, >> TIOCSCTTY, ...)", I cann't find any document about "ioctl(1, >> TIOCSCTTY, ...)" . > > Because standard input/output is connected to the linux terminal device > (in this case /dev/tty0 since gmenu2x was started by init for the first > terminal). > > When SDL initialized its keyboard input system, it issues > ioctl(fd,TIOSCTTY,0) to the terminal device, disabling it as controlling > terminal. ioctl(1,TIOSCTTY,1) undoes that, but seems to only work if we > create a new session via setsid() first. > > does that answer your question?
thanks for the answer. > It means stdout (the file descriptor, not the stream). As Alan pointed > out, we could (and should) replace this with constant STDOUT_FILENO as > defined in unistd.h > just create another commit: "using STDOUT_FILENO, remove tcsetpgrp" http://qi-hw.com/p/gmenu2x/bfe772b > > cheers, > > David -- Best Regards Xiangfu -- Qi RSS feed, http://en.qi-hardware.com/feed/rss20.xml -- _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
