Date: Sun, 5 Feb 2012 07:20:05 GMT From: Eric Wong <normalperson@yhbt.net> To: freebsd-gnats-submit@FreeBSD.org Subject: standards/164787: dirfd() function not available when _POSIX_C_SOURCE is defined Message-ID: <201202050720.q157K569080870@red.freebsd.org> Resent-Message-ID: <201202050730.q157UADm073763@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 164787
>Category: standards
>Synopsis: dirfd() function not available when _POSIX_C_SOURCE is defined
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-standards
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Feb 05 07:30:09 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Eric Wong
>Release: 8.2-RELEASE
>Organization:
>Environment:
FreeBSD f82 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
dirfd(3) is now specified in POSIX.1-2008, so it should be available
when the _POSIX_C_SOURCE macro is defined to >= 200809L
However, /usr/include/dirent.h only exposes the dirfd() macro if
__BSD_VISIBLE is defined. However, __BSD_VISIBLE appears to be false
if _POSIX_C_SOURCE is defined.
>How-To-Repeat:
/*
* To build + link:
* gcc -o dirfdtest dirfdtest.c
* having _POSIX_C_SOURCE defined will cause this to fail link
*/
#define _POSIX_C_SOURCE 200809L
#include <dirent.h>
int main(void)
{
DIR *dir = opendir(".");
dirfd(dir);
return 0;
}
>Fix:
It's probably best to add dirfd() as a function to libc, allowing the opacity
of the struct _dir_desc to be preserved.
>Release-Note:
>Audit-Trail:
>Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201202050720.q157K569080870>