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Bug #971

w(1) is confused by screen

Added by River Tarnell over 8 years ago. Updated over 8 years ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
cmd - userland programs
Start date:
2011-04-28
Due date:
% Done:

0%

Estimated time:
Difficulty:
Tags:

Description

Correct output from 'w' when using screen in non-login mode:

login% w
  2:41pm  up 23 day(s), 15:11,  3 users,  load average: 0.38, 0.32, 0.33
User     tty           login@  idle   JCPU   PCPU  what
river    pts/8        Wed11am  2:00     11      6  -zsh
river    pts/9        Wed 2pm                      -zsh
river    pts/11       Wed11am            2      2  screen -rd

When switching one screen window to logged in mode (:login on), it continues to print 3 users, although there are now 4:

login% w
  2:41pm  up 23 day(s), 15:11,  3 users,  load average: 0.34, 0.31, 0.33
User     tty           login@  idle   JCPU   PCPU  what
river    pts/8        Wed11am  2:00     11      6  -zsh
river    pts/9        Wed 2pm                      -zsh
river    pts/11       Wed11am            2      2  screen -rd
river    pts/12        2:41pm         1:52   1:52  epic5 felicity__ irc.freenode.ne

Output from 'who' for comparison:

river      pts/8        Apr 27 11:47    (ilythia.tcx.org.uk)
river      pts/9        Apr 27 14:05    (ilythia.tcx.org.uk)
river      pts/11       Apr 27 11:40    (ilythia.tcx.org.uk)
river      pts/12       Apr 28 14:41    (:pts/11:S.0)

History

#1

Updated by Albert Lee over 8 years ago

Quote attributed to Bryan: "Unbelievably, for utmp entries which correspond to running processes (thatis, utmp entries of type USER_PROCESS), the e_exit field is zero ifthe entry was created by superuser, or NONROOT_USR otherwise (I'mnot making this up). NONROOT_USR is #define'd to be 2 (despite thefact that there is no 1; Moonbeam was probably just trying to flip the bird to The Man). Interestingly, there is no 3, or anything else for thatmatter. There is, however, a macro to get at this value: nonuser() (probably added by Moonbeam while in Rehab in the Nancy Reganite mid '80s).The macro is used virtually nowhere, with one notable exception:(you guessed it) who(1)."

#2

Updated by Albert Lee over 8 years ago

  • Category set to cmd - userland programs
  • Priority changed from Normal to Low
#3

Updated by River Tarnell over 8 years ago

In short, the first line of w's output counts only 'root' processes, while the listing displays processes from all users. This seems confusing and not very useful: either something is a user, or it's not.

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