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From: guy@gorodish.Sun.COM (Guy Harris)
Newsgroups: comp.lang.c,comp.unix.questions
Subject: Re: system (and mkdir)
Message-ID: <40510@sun.uucp>
Date: 30 Jan 88 00:28:23 GMT
References: <127@dcrbg1.UUCP> <9472@ccicpg.UUCP> <2771@cbdkc1.ATT.COM>, <449@cpsc6b.cpsc6a.att.com>
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(This long ago ceased to be a C-related discussion; it is now a UNIX-related
discussion.  It is now being redirected to comp.unix.questions.)

> Actually, there is not much reason for worrying about whether or not
> there is a library function for mkdir on most (all?) System V boxes,
> since the mkdir system call is reserved for the super user alone.

WRONG.  It is not a privileged system call in S5R3.

> In the standard System V world, you will find that even the 'mkdir' command
> is setuid to root.

Not in S5R3.1, at least, and probably not in S5R3.  On the 3B2/400s we have
here, running S5R3.1, "/bin/mkdir" is not set-UID, and it works just fine.

In S5 systems *prior* to S5R3, it is set-UID "root" because it has to use the
privileged "mknod" system call.
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com