Date: Fri, 16 Jul 2010 10:21:48 +0000 From: Jens Rehsack <rehsack@googlemail.com> To: Ashish SHUKLA <ashish@freebsd.org> Cc: Dan Nelson <dnelson@allantgroup.com>, freebsd-questions@freebsd.org Subject: Re: getpwent bug? Message-ID: <4C4032BC.90608@netbsd.org> In-Reply-To: <86wrsvpx0v.fsf@chateau.d.if> References: <AANLkTin5RGYfu_Xt5HWxKFO8GMTOi3YWQ8dyr95ZDW-Y@mail.gmail.com> <20100715172615.GC5485@dan.emsphone.com> <86tyo0qd19.fsf@chateau.d.if> <20100716043056.GF5485@dan.emsphone.com> <AANLkTilSum3vumQhv4qtOQhCaSHo832Ub3b9bEhP0zSt@mail.gmail.com> <86d3unrfgu.fsf@chateau.d.if> <4C401B31.4000402@netbsd.org> <8639vjrdru.fsf@chateau.d.if> <4C402689.7070005@netbsd.org> <86wrsvpx0v.fsf@chateau.d.if>
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On 07/16/10 09:59, Ashish SHUKLA wrote: > Jens Rehsack writes: >> On 07/16/10 09:12, Ashish SHUKLA wrote: >>> Jens Rehsack writes: >>> >>> [...] >>> >>>> I cached the entires - I rate setpwent as to dangerous. >>> >>> dangerous ? why ? > >> Because it modifies something - and I might not know the source. >> getpwent(3) delivers entries from yp, too (or LDAP) etc. - and >> when I call setpwent(3) for such an entry, what happens then? > >> Long explanation for: I do not know the consequences - and that's >> why I rate it dangerous as workaround. > > ,---- an excerpt from getpwent(3) [...] > `---- > > I can't see anything which says about modifying NSS database. AFAIK none of > the NSS routines allow you to write on database, you've to use the database > specific method to modify the database. You're absolutely right - I never took a deeper look, because I always was only interested to read the (user|group) data and expected setpwent to modify such an entry. A quick look into Stevens "Advanced Programming in the UNIX environment" could had enlighten myself. Sorry that I didn't RTFM carefully. Best regards and many, many thanks, Jens
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