Date: Fri, 17 Jun 2016 16:38:39 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 210288] File descriptors created by pipe are both read/write Message-ID: <bug-210288-8-ndAUkdWPDt@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-210288-8@https.bugs.freebsd.org/bugzilla/> References: <bug-210288-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D210288 Jilles Tjoelker <jilles@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jilles@FreeBSD.org --- Comment #1 from Jilles Tjoelker <jilles@FreeBSD.org> --- The FreeBSD man page pipe(2) clearly documents that pipes are bidirectional= and that this is not portable. Bidirectional pipes were first introduced with STREAMS in System V release = 4, one of POSIX's source implementations, so POSIX would not disallow them. Si= nce SUSv3 and POSIX.1-2001, there has been explicit allowance in the "pipe" pag= e: > It is unspecified whether fildes[0] is also open for writing and whether > fildes[1] is also open for reading. I agree that this feature is somewhat questionable. It may hide bugs and its deliberate use is more prone to deadlocks than unidirectional pipes are, bu= t I don't think it should be removed. --=20 You are receiving this mail because: You are the assignee for the bug.=
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