From 716d96b8eb00f0f43a01d1707cbc1d611c10454b Mon Sep 17 00:00:00 2001
From: Lukas Nykryn <lnykryn@redhat.com>
Date: Tue, 16 Apr 2013 15:58:32 +0200
Subject: [PATCH] ps: possibility to display login session for a process
Library systemd-login offers possibility to display name
of login session for specific pid.
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).
This patch adds output option "sd_session" which will
show name of session or "-", when process does not belong
to any session.
To maintain compatibility with non-systemd systems,
procps must be configured with --with-systemd option
to enable this option.
---
ps/output.c | 20 ++++++++++++++++++++
ps/ps.1 | 4 ++++
2 files changed, 24 insertions(+)
diff --git a/ps/output.c b/ps/output.c
index 39b77637..f1cf6bc0 100644
--- a/ps/output.c
+++ b/ps/output.c
@@ -1191,6 +1191,25 @@ fail:
outbuf[1] = '\0';
return 1;
}
+
+static int pr_sd_session(char *restrict const outbuf, const proc_t *restrict const pp){
+ int r;
+ size_t len;
+ char *session;
+
+ r = sd_pid_get_session(pp->tgid, &session);
+ if(r<0) goto fail;
+ len = snprintf(outbuf, COLWID, "%s", session);
+ free(session);
+ return len;
+
+fail:
+ outbuf[0] = '-';
+ outbuf[1] = '\0';
+ return 1;
+}
+
+
#endif
/****************** FLASK & seLinux security stuff **********************/
// move the bulk of this to libproc sometime
@@ -1519,6 +1538,7 @@ static const format_struct format_array[] = {
{"scnt", "SCNT", pr_nop, sr_nop, 4, 0, DEC, AN|RIGHT}, /* man page misspelling of scount? */
{"scount", "SC", pr_nop, sr_nop, 4, 0, AIX, AN|RIGHT}, /* scnt==scount, DEC claims both */
#ifdef WITH_SYSTEMD
+{"sd_session","SESSION", pr_sd_session, sr_nop, 11, 0, LNX, ET|LEFT},
{"sd_unit", "UNIT", pr_sd_unit, sr_nop, 31, 0, LNX, ET|LEFT},
#endif
{"sess", "SESS", pr_sess, sr_session, 5, 0, XXX, PO|PIDMAX|RIGHT},
diff --git a/ps/ps.1 b/ps/ps.1
index 0d66cf95..f953e23a 100644
--- a/ps/ps.1
+++ b/ps/ps.1
@@ -1489,6 +1489,10 @@ SCHED_FIFO, SCHED_RR, SCHED_BATCH, SCHED_ISO, and SCHED_IDLE are respectively
displayed as 0, 1, 2, 3, 4, and 5.
T}
+sd_session SESSION T{
+displays login session identifier of a process.
+T}
+
sd_unit UNIT T{
displays systemd unit which a process belongs to.
T}
--
2.40.0