Date: Tue, 19 Aug 1997 20:47:00 -0700 (PDT) From: Alex Belits <abelits@phobos.illtel.denver.co.us> To: hackers@freebsd.org Subject: S_ISFIFO and S_ISSOCK Message-ID: <Pine.LNX.3.95.970819200222.4982A-100000@phobos.illtel.denver.co.us>
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In /usr/include/sys/stat.h:
#ifndef _POSIX_SOURCE
[skipped]
#define S_IFIFO 0010000 /* named pipe (fifo) */
[skipped]
#define S_IFSOCK 0140000 /* socket */
#endif
[skipped]
#define S_ISFIFO(m) (((m) & 0170000) == 0010000 || \
((m) & 0170000) == 0140000) /* fifo or socket */
#ifndef _POSIX_SOURCE
[skipped]
#define S_ISSOCK(m) (((m) & 0170000) == 0010000 || \
((m) & 0170000) == 0140000) /* fifo or socket */
[skipped]
#endif
In other words, fifo and socket have different flags, but checks for
them treat them as one? And it's mentioned that S_IFIFO is set for named
pipes while in fact it's set for both anonymous and named ones, while
S_IFSOCK is set for sockets only.
Is it something that was left of BSD4.4 implementation of anonymous pipe
as a kind of socket? But #ifndef _POSIX_SOURCE around S_ISSOCK macro looks
suspicious...
--
Alex
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