Full Disclosure mailing list archives
Re: readdir_r considered harmful
From: Casper.Dik () Sun COM
Date: Sat, 05 Nov 2005 19:45:20 +0100
The Austin Group should amend POSIX and the SUS in one or more of the following ways: 1. Standardise the dirfd function from BSD and recommend its use in determining the buffer size for readdir_r. 2. Specify a new variant of readdir in which the buffer size is explicit and the function returns an error code if the buffer is too small. 3. Specify that NAME_MAX must be defined as the length of the longest name that can be used on any filesystem. (This seems to be what many or most implementations attempt to do at present, although POSIX currently specifies otherwise.)
Why not: 4. Require the readdir() implementation to use state local to dirp. I've never understood the rationale behind readdir_r; it's like someone went through the manual looking for "pointers to static locations" and defined new functions with _r for each of them, suspending thinking. But perhaps people can look at how their readdir() implementations behave. The Solaris implementation appears to be "unshared dirp safe". Casper _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- readdir_r considered harmful Ben Hutchings (Nov 01)
- Re: readdir_r considered harmful 3APA3A (Nov 01)
- Re: readdir_r considered harmful Ben Hutchings (Nov 01)
- Re: readdir_r considered harmful Ben Hutchings (Nov 01)
- Re: readdir_r considered harmful Casper . Dik (Nov 05)
- Re: Re: readdir_r considered harmful Ulrich Drepper (Nov 05)
- Re: Re: readdir_r considered harmful Casper . Dik (Nov 06)
- Re: Re: readdir_r considered harmful Ulrich Drepper (Nov 06)
- Re: Re: readdir_r considered harmful Casper . Dik (Nov 07)
- Re: Re: readdir_r considered harmful Andrew Miller (Nov 07)
- Re: Re: readdir_r considered harmful Ulrich Drepper (Nov 05)
- Re: Re: readdir_r considered harmful Andrew Farmer (Nov 07)
- Re: Re: readdir_r considered harmful Casper . Dik (Nov 08)
- Re: readdir_r considered harmful 3APA3A (Nov 01)