07-17-2002
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I don't use CDE. But if your program is getting a SIGHUP, there is a way to find out why. You can use sigaction() to install a signal handler. A signal handler installed by sigaction will be called with a pointer to a siginfo structure. The handler can examine the values in the structure to figure out why the signal arrived. Of particular interest are si_pid (sending process ID) and si_uid (sending user ID). The handler could log this info. It could even run "ps" for the pid in question and log that. Then after it exits, you will know exactly why.
And a process can always call getpgrp() to get its own process group id. And it can call getsid() to get the process group id of its session leader.
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LEARN ABOUT NETBSD
killpg
KILLPG(3) BSD Library Functions Manual KILLPG(3)
NAME
killpg -- send signal to a process group
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h>
int
killpg(pid_t pgrp, int sig);
DESCRIPTION
killpg() sends the signal sig to the process group pgrp. See sigaction(2) for a list of signals. If pgrp is 0, killpg() sends the signal to
the sending process's process group.
The sending process and members of the process group must have the same effective user ID, or the sender must be the super-user. As a single
special case the continue signal SIGCONT may be sent to any process that is a descendant of the current process.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
killpg() will fail and no signal will be sent if:
[EINVAL] sig is not a valid signal number.
[ESRCH] No process can be found in the process group specified by pgrp.
[ESRCH] The process group was given as 0 but the sending process does not have a process group.
[EPERM] The sending process is not the super-user and one or more of the target processes has an effective user ID different from
that of the sending process.
SEE ALSO
getpgrp(2), kill(2), sigaction(2)
HISTORY
The killpg() function call appeared in 4.0BSD.
BSD
June 2, 1993 BSD