07-22-2009
Need explanation of 'who -d' output
Can someone tell me what the output of 'who -d' is ?
What's causing the process in the list to be there ?
What can be done to get rid of / fix those process ?
Are those process simple problems, important or urgent onces ?
I am asking because while looking for another 'who' option, I saw that '-d' one and when I tried it it listed close to 50 process in it on a server that has been rebooted less then one month ago. From a Google search I see that they are somekind of dead process left from init/users (???) but do not fully understand what they are, where they come from, if they are normal and what can be done about them.
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setpgrp(2) System Calls Manual setpgrp(2)
NAME
setpgrp - set process group ID
SYNOPSIS
DESCRIPTION
If the calling process is not already a session leader, sets the process group ID of the calling process to the process ID of the calling
process. If creates a new session, then the new session has no controlling terminal.
The function has no effect when the calling process is a session leader.
Security Restrictions
Some or all of the actions associated with this system call may require privileges. See privileges(5) for more information.
RETURN VALUE
Upon successful completion, returns the new process group ID.
ERRORS
If fails, no changes occur and (see errno(2)) is set to one of the following values:
The calling process is already a process group leader or
the process group ID of a process other than the calling process matches the process ID of the calling process.
The calling process does not have sufficient privileges.
SEE ALSO
exec(2), fork(2), getpid(2), getsid(2), kill(2), setpgrp3(2), setsid(2), privileges(5), <unistd.h>.
STANDARDS CONFORMANCE
setpgrp(2)