Date: Fri, 19 Jul 1996 13:03:26 +1000 From: Bruce Evans <bde@zeta.org.au> To: markd@Grizzly.COM, wpaul@skynet.ctr.columbia.edu Cc: FreeBSD-gnats-submit@freebsd.org, bugs@freefall.freebsd.org Subject: Re: kern/1397: can't send to a pipe Message-ID: <199607190303.NAA30974@godzilla.zeta.org.au>
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>Reporting FIFO would probably be better than SOCK, at least that wouldn't >lead people to do the wrong thing because they think its a socket. >Given all of this, the definition of S_ISFIFO probably is wrong as well: >#define S_ISFIFO(m) (((m) & 0170000) == 0010000 || \ > ((m) & 0170000) == 0140000) /* fifo or socket */ This is a kludge for nameless pipes being implemented as sockets. There was no way to distinguish between a nameless pipe and a socket, at least using the stat classifition macros or mode bits. Portable code will have to deal with this for years. It's still in 2.1.5 and it's probably in many other BSD4.4-derived systems. The above #define should be changed soon. I'm a bit worried about new ports and libraries being used with old kernels. Bruce
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