signal() is unsafe, unportable, and deprecated. sigaction() is almost
always preferred. (On SysV OS'es, including Solaris, signal() resets
the signal handler to the default when the signal is received, leaving
a race condition before the handler can reassert it - sigaction does not
do this. See "Advanced Programming in the Unix Environment" or "Solaris
Systems Programming" for much greater details - Sun employees can read
either online for free through Sun's safari subscription. A shorter
online description can be read at:
http://stackoverflow.com/questions/231912/what-is-the-difference-between-sigaction-and-signal
)
I'll bet the actual cause and more correct fix is the failure to initialize
the sa_mask & sa_flags members of the sigaction struct, and the failure to
check if sigaction() returned an error.
-Alan Coopersmith- alan.coopersmith at sun.com
Sun Microsystems, Inc. - X Window System Engineering
Halton Huo wrote:
> Hi,
>
> console-kit-daemon will receive SIGPOLL when VT is switched, this will
> cause c-k-d exit. It is because the process does not go into
> handle_vt_active() as we wish.
>
> Aaron helps me find out that using signal() rather than sigaction() fix
> this issue.
>
> Refer to bug http://defect.opensolaris.org/bz/show_bug.cgi?id=11612 for
> more information.
>
> Thanks,
> Halton.
>
