lenny@quincy.UUCP (Lenny Tropiano) (12/09/87)
On my UNIX PC I have noticed a problem occasionally with the
getlogin(3C) system call. At certain times I have noticed
getlogin returning "LOGIN" or "rc" instead of the user's name
who is logged in.
I know what "LOGIN" and "rc" are, but why are they showing up
for a valid logged-in user? This is quite strange...
--- piece of code ---
char *getlogin();
printf("User is: %s\n", getlogin());
--- end piece of code ---
Any suggestions? I have recreated the /etc/utmp, /etc/wtmp and
this hasn't cleared up the problem. Sometimes it goes away
and other times it comes back.
Thanks,
Lenny
--
Lenny Tropiano UUCP: ...uunet!godfre!quincy!lenny -or-
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Islandia, New York 11722 +1 516-582-5525 ...ihnp4!icus!quincy!lennylenny@icus.UUCP (Lenny Tropiano) (08/15/88)
In article <578@proxftl.UUCP> aaron@proxftl.UUCP (Aaron Zimmerman) writes: |>I have a curious problem on my 3b1... |> ... |>$ who am i |>aaron w4 Aug 12 08:01 |>$ passwd |>Changing password for LOGIN |>Permission denied. ... The problem occurs not in passwd (or the /etc/passwd file), but in the getlogin(3C) function call. This problem occurs if you use multiple getty's on /dev/window, or you have something running on w1 when the getty respawns for /dev/window. The following example with show this: lenny + w1 Aug 14 20:05 . 4428 root + w4 Aug 14 21:51 . 5623 (Note: I'm logged in with two gettys, the current one is w4). # tty /dev/w4 # passwd Changing password for lenny New password: [...] getlogin(3C) looks up the /dev/window login finding the first entry in /etc/utmp it finds. I maybe logged in on w4 as root, but getlogin thinks I am logged in as lenny on w1. In your case with user LOGIN, it found was a LOGIN_PROCESS. (A "getty" process waiting for login) Something like: LOGIN + window Aug 14 21:54 . 5880 root + w4 Aug 14 21:51 . 5623 Those are the disadvantages in running multiple gettys, although having the capability to login more than once is nice. (Something I'm working into the window-manager I am rewriting). -Lenny -- Paper-net: Lenny Tropiano | @-net: lenny@icus.UUCP ICUS Software Systems | !-net: ...sbcs \ PO Box 1 | boulder \ Islip Terrace, NY 11752 | talcott !icus!lenny Vocal-net: (516) 582-5525 [work] | pacbell / (516) 968-8576 [home] | hombre / Telex-net: 154232428 ICUS | Another-net: attmail!icus!lenny
woods@gpu.utcs.toronto.edu (Greg Woods) (08/16/88)
In article <467@icus.UUCP> lenny@icus.UUCP (Lenny Tropiano) writes: >In article <578@proxftl.UUCP> aaron@proxftl.UUCP (Aaron Zimmerman) writes: >|>I have a curious problem on my 3b1... >|> >... >|>$ who am i >|>aaron w4 Aug 12 08:01 >|>$ passwd >|>Changing password for LOGIN >|>Permission denied. >... > >The problem occurs not in passwd (or the /etc/passwd file), but in the >getlogin(3C) function call. This problem occurs if you use multiple >getty's on /dev/window, or you have something running on w1 when the >getty respawns for /dev/window. I've also had this problem with 386/ix, when a getty in the LOGIN state dies abnormally. A 'who -a' shows LOGIN and xyzzy both on the port, but it gives an exit status for LOGIN. I'd call this a bug (and I will bug-report it too). The problem occurs with any utility that calls getlogin(3C), including mail, etc. -- Greg Woods. UUCP: utgpu!woods, utgpu!{ontmoh, ontmoh!ixpierre}!woods VOICE: (416) 242-7572 [h] LOCATION: Toronto, Ontario, Canada