Xref: utzoo comp.unix.questions:14631 comp.unix.wizards:17106
Path: utzoo!attcan!uunet!twwells!bill
From: bill@twwells.com (T. William Wells)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: Named Pipe Creation
Keywords: pipe
Message-ID: <1989Jul2.033624.28953@twwells.com>
Date: 2 Jul 89 03:36:24 GMT
References: <163@cerc.wvu.wvnet.edu.edu>
Organization: None, Ft. Lauderdale, FL
Lines: 30

In article <163@cerc.wvu.wvnet.edu.edu> drs@cerc.wvu.wvnet.edu (Darrell Schiebel) writes:
: I am attempting to create a named pipe which several different users
: can read from and write to, but when I create the pipe with:
:
:       if (mknod(destination_path,S_IFIFO | 0666, 0) == -1)
:         if (errno != EEXIST)
:           return(-1);
:         else errno = 0;
:
:       sock = open(destination_path,O_RDWR);
:
: the system creates a pipe with owner r/w, group r, and world r.  The
: protection I was expecting is owner r/w , group r/w, wnd world r/w.

Surround your code with something like:

	savemask = umask(0);
	...
	(void)umask(savemask);

after, RTFM'ing.

BTW, it looks like you are trying to be clever with errno. Don't. The
only thing you are guaranteed by the documentation is that it is set
properly after a system call returns an error. For all you know, errno
could be set to a random value on success.

---
Bill                    { uunet | novavax | ankh | sunvice } !twwells!bill
bill@twwells.com