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Article #150Summary: getlogin() problem
From: Don Costello
Date: Mon, 27 Jul 1992 11:38
Date: Mon, 27 Jul 1992 11:38
41 lines
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1616 bytes
Thanks to the following people, the getlogin() problem (which is really not a problem) is finally solved: leo@ine.philips.nl graham@castle.edinburgh.ac.uk Matt Schroth cjc@ulysses.att.com David A. Wagner John Eric Fosler David Myers cjc@ulysses.att.com It seems that, according to the man page, (which I obviously didn't read too thoroughly :-) getlogin reads /etc/utmp, returning the ID of the owner of whatever tty the user is on. When doing an su to another login, there is no utmp entry for the new login, only the original one. The following is the solution: #include <all-the-normal-stuff> #include <pwd.h> char *username; struct passwd *userinfo; userinfo=getpwuid(getuid()); username=userinfo->pw_name; "username" now points to the name of the current (su'd) login id (userinfo->pw_name), not the original. Thanks again to all who have helped. ==- dcc-== -- +------------------------------------+---------------------------+ | Don Costello, DASC-ZSC | It's hard to cram this | | DLA Cameron Station, VA | signature into just 4 | | TEL: (703) 274-7215 AV: 284-7215 | lines!!! |
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arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!udecc.engr.udayton.edu!blackbird.afit.af.mil!dsacg3.dsac.dla.mil!dsac.dla.mil!hq.dla.mil!fazc016Show Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!udecc.engr.udayton.edu!blackbird.afit.af.mil!dsacg3.dsac.dla.mil!dsac.dla.mil!hq.dla.mil!fazc016 From: fazc016@hq.dla.mil (Don Costello) Newsgroups: comp.unix.programmer Subject: Summary: getlogin() problem Message-ID: <833@hq.dla.mil> Date: 27 Jul 92 11:38:29 GMT Organization: HQ Defense Logistics Agency/DASC, Cameron Station, VA Lines: 41 X-Newsreader: Tin 1.1 PL4