ps: possibility to display uid of session owner for a process

Library systemd-login offers possibility to display the Unix
user identifier of the owner of the session of a process.
This information will also be displayed for user processes which
are shared between multiple login sessions of the same user,
where sd_session will be blank.

This patch adds output option "sd_ouid" which will show
user UID or "-", when there is no owner for a process.

To maintain compatibility with non-systemd systems,
procps must be configured with --with-systemd option
to enable this option.

diff --git a/ps/output.c b/ps/output.c
index f1cf6bc03226e95d73a59b39c42fbbd822fa94ac..012f5b6938cb14ca77a27784abeea00f743b0efe 100644 (file)
--- a/ps/output.c
+++ b/ps/output.c
@@ -1209,6 +1209,21 @@ fail:
   return 1;
 }
 
+static int pr_sd_ouid(char *restrict const outbuf, const proc_t *restrict const pp){
+  int r;
+  size_t len;
+  uid_t ouid;
+
+  r = sd_pid_get_owner_uid(pp->tgid, &ouid);
+  if(r<0) goto fail;
+  return snprintf(outbuf, COLWID, "%d", ouid);
+
+fail:
+  outbuf[0] = '-';
+  outbuf[1] = '\0';
+  return 1;
+}
+
 
 #endif
 /****************** FLASK & seLinux security stuff **********************/
@@ -1538,6 +1553,7 @@ 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_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},
 #endif

diff --git a/ps/ps.1 b/ps/ps.1
index f953e23ad1ee6da34272e351cbcf4fef3186e770..7d2ce73fe093827f702407a10931323195d5353f 100644 (file)
--- 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_ouid        OWNER   T{
+displays the Unix user identifier of the owner of the session of a process.
+T}
+
 sd_session     SESSION T{
 displays login session identifier of a process.
 T}