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ps: possibility to display login session for a process

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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.
This commit is contained in:
Lukas Nykryn 2013-04-16 15:58:32 +02:00
parent 7ab5d33c5c
commit 716d96b8eb
2 changed files with 24 additions and 0 deletions
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20
ps/output.c
View File

@ -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},

4
ps/ps.1
View File

@ -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}