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ps: possibility to display systemd user unit for a process

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Library systemd-login offers possibility to display
name of systemd user unit for specific pid. Note that not all
processes are part of a user unit.

This patch adds output option "sd_uunit" which will
show name of user unit or "-", when process does not belong
to any user unit. This is similar to "sd_unit" but applies
to user units instead of system units.

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 2013-04-22 12:56:02 +02:00
parent 4c1536d5f1
commit 38e8087d55
2 changed files with 23 additions and 0 deletions
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19
ps/output.c
View File

@ -1240,6 +1240,24 @@ fail:
outbuf[1] = '\0';
return 1;
}
static int pr_sd_uunit(char *restrict const outbuf, const proc_t *restrict const pp){
int r;
size_t len;
char *unit;
r = sd_pid_get_user_unit(pp->tgid, &unit);
if(r<0) goto fail;
len = snprintf(outbuf, COLWID, "%s", unit);
free(unit);
return len;
fail:
outbuf[0] = '-';
outbuf[1] = '\0';
return 1;
}
#endif
/****************** FLASK & seLinux security stuff **********************/
// move the bulk of this to libproc sometime
@ -1572,6 +1590,7 @@ static const format_struct format_array[] = {
{"sd_ouid", "OWNER", pr_sd_ouid, sr_nop, 5, 0, LNX, ET|LEFT},
{"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},
{"sd_uunit", "UUNIT", pr_sd_uunit, sr_nop, 31, 0, LNX, ET|LEFT},
#endif
{"sess", "SESS", pr_sess, sr_session, 5, 0, XXX, PO|PIDMAX|RIGHT},
{"session", "SESS", pr_sess, sr_session, 5, 0, LNX, PO|PIDMAX|RIGHT},

4
ps/ps.1
View File

@ -1505,6 +1505,10 @@ sd_unit UNIT T{
displays systemd unit which a process belongs to.
T}
sd_uunit UUNIT T{
displays systemd user unit which a process belongs to.
T}
sess SESS T{
session ID or, equivalently, the process ID of the session leader. (alias
.BR session , \ sid ).