rejise
August 23, 2001, 9:39am
1
Hi,
If we have a process p1 running and then p2 attempts to shutdown p1. Is there a means for p1 to know who has requested him to shutdown
Thanks and regards,
Neo
August 23, 2001, 9:09pm
2
Yes, most signal handleing routines have some form of data structure that tells you the name of the sending process. The example data structure from linux (below) from the sigaction man page provides a glimpse into how this is done in one OS:
The siginfo_t parameter to sa_sigaction is a struct with
siginfo_t {/ An errno value / Signal code / Sending process ID / Real user ID of sending process / Exit value or signal / User time consumed / System time consumed / Signal value / POSIX.1b signal / POSIX.1b signal / Memory location which caused fault / Band event / File descriptor */