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[Bug manual/6891] New: description of dirfd() doesnt mention returned fd is unusable
- From: "siward at wanadoo dot nl" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 15 Sep 2008 20:11:05 -0000
- Subject: [Bug manual/6891] New: description of dirfd() doesnt mention returned fd is unusable
- Reply-to: sourceware-bugzilla at sourceware dot org
Hello again everyone,
In manual, function dirfd() is described :
int dirfd( DIR* DIRSTREAM )
returns file descriptor associated with directory stream DIRSTREAM.
This descriptor can be used until directory is closed with `closedir'.
If directory stream implementation is not using file descriptors,
return value is -1 .
but this does not mention that
returned filedescriptior is only usable for passing on to fchdir().
from my experiments, i found :
TestMmapDir: getfd ok ; flags = 0x1
TestMmapDir: flag cloexec = 1
TestMmapDir: getfl ok ; flags = 0x98800
TestMmapDir: flag read-access = 0
TestMmapDir: flag write-access = 0
TestMmapDir: flag append-mode = 0
TestMmapDir: flag non-blocking = 1
TestMmapDir: flag async = 0
TestMmapDir: flag fsync = 0
TestMmapDir: flag no-atime = 0
So i won't be able to mmap a directory :0/
I think it would be usefull to mention
lack of permissions of returned filedescriptor
in manual.
--
Summary: description of dirfd() doesnt mention returned fd is
unusable
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: manual
AssignedTo: roland at gnu dot org
ReportedBy: siward at wanadoo dot nl
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=6891
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