10-14-2002
No.
Just to prevent annoying a legitimate user, ensure you have isolated the correct PID, and verified that the corresponding login session is indeed idle, and no longer in use.
I have never known a system to restart by killing the PID of any login session.
BTW kill -9 [PID] should be sufficient.
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LEARN ABOUT OPENSOLARIS
sd_pid_get_owner_uid
SD_PID_GET_SESSION(3) sd_pid_get_session SD_PID_GET_SESSION(3)
NAME
sd_pid_get_session, sd_pid_get_unit, sd_pid_get_owner_uid - Determine session, service or owner of a session of a specific PID
SYNOPSIS
#include <systemd/sd-login.h>
int sd_pid_get_session(pid_t pid, char** session);
int sd_pid_get_unit(pid_t pid, char** unit);
int sd_pid_get_owner_uid(pid_t pid, uid_t* uid);
DESCRIPTION
sd_pid_get_session() may be used to determine the login session identifier of a process identified by the specified process identifier. The
session identifier is a short string, suitable for usage in file system paths. Note that not all processes are part of a login session
(e.g. system service processes, user processes that are shared between multiple sessions of the same user, or kernel threads). For
processes not being part of a login session this function will fail. The returned string needs to be freed with the libc free(3) call after
use.
sd_pid_get_unit() may be used to determine the systemd unit (i.e. system service) identifier of a process identified by the specified
process identifier. The unit name is a short string, suitable for usage in file system paths. Note that not all processes are part of a
unit/service (e.g. user processes, or kernel threads). For processes not being part of a systemd unit/system service this function will
fail. The returned string needs to be freed with the libc free(3) call after use.
sd_pid_get_owner_uid() may be used to determine the Unix user identifier of the owner of the session of a process identified the specified
PID. Note that this function will succeed for user processes which are shared between multiple login sessions of the same user, where
sd_pid_get_session() will fail. For processes not being part of a login session and not being a shared process of a user this function will
fail.
If the pid paramater of any of these functions is passed as 0 the operation is executed for the calling process.
RETURN VALUE
On success these calls return 0 or a positive integer. On failure, these calls return a negative errno-style error code.
NOTES
The sd_pid_get_session(), sd_pid_get_pid(), and sd_pid_get_owner_uid() interfaces are available as shared library, which can be compiled
and linked to with the libsystemd-login pkg-config(1) file.
Note that the login session identifier as returned by sd_pid_get_session() is completely unrelated to the process session identifier as
returned by getsid(2).
SEE ALSO
systemd(1), sd-login(7), sd_session_is_active(3), getsid(2)
AUTHOR
Lennart Poettering <lennart@poettering.net>
Developer
systemd 10/07/2013 SD_PID_GET_SESSION(3)