08-23-2001
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:
Quote:
The siginfo_t parameter to sa_sigaction is a struct with
the following elements
siginfo_t {
int si_signo; /* Signal number */
int si_errno; /* An errno value */
int si_code; /* Signal code */
pid_t si_pid; /* Sending process ID */
uid_t si_uid; /* Real user ID of sending process */
int si_status; /* Exit value or signal */
clock_t si_utime; /* User time consumed */
clock_t si_stime; /* System time consumed */
sigval_t si_value; /* Signal value */
int si_int; /* POSIX.1b signal */
void * si_ptr; /* POSIX.1b signal */
void * si_addr; /* Memory location which caused fault */
int si_band; /* Band event */
int si_fd; /* File descriptor */
}
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SHUTDOWN(8) System Manager's Manual SHUTDOWN(8)
NAME
shutdown - close down the system at a given time
SYNOPSIS
shutdown [ -k ] [ -r ] [ -h ] [ -f ] [ -n ] time [ warning-message ... ]
DESCRIPTION
Shutdown provides an automated shutdown procedure which a super-user can use to notify users nicely when the system is shutting down, sav-
ing them from system administrators, hackers, and gurus, who would otherwise not bother with niceties.
Time is the time at which shutdown will bring the system down and may be the word now (indicating an immediate shutdown) or specify a
future time in one of two formats: +number and hour:min. The first form brings the system down in number minutes and the second brings the
system down at the time of day indicated (as a 24-hour clock).
At intervals which get closer together as apocalypse approaches, warning messages are displayed at the terminals of all users on the sys-
tem. Five minutes before shutdown, or immediately if shutdown is in less than 5 minutes, logins are disabled by creating /etc/nologin and
writing a message there. If this file exists when a user attempts to log in, login(1) prints its contents and exits. The file is removed
just before shutdown exits.
At shutdown time a message is written in the system log, containing the time of shutdown, who ran shutdown and the reason. Then a termi-
nate signal is sent to init to bring the system down to single-user state. Alternatively, if -r, -h, or -k was used, then shutdown will
exec reboot(8), halt(8), or avoid shutting the system down (respectively). (If it isn't obvious, -k is to make people think the system is
going down!)
With the -f option, shutdown arranges, in the manner of fastboot(8), that when the system is rebooted the file systems will not be checked.
The -n option prevents the normal sync(2) before stopping.
The time of the shutdown and the warning message are placed in /etc/nologin and should be used to inform the users about when the system
will be back up and why it is going down (or anything else).
FILES
/etc/nologin tells login not to let anyone log in
SEE ALSO
login(1), reboot(8), fastboot(8)
BUGS
Only allows you to kill the system between now and 23:59 if you use the absolute time for shutdown.
4th Berkeley Distribution November 16, 1996 SHUTDOWN(8)