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Message-ID: <000501c4d251$8ae73a50$86c8a8c0@MervaSBS2003.local> Date: Wed, 24 Nov 2004 19:15:13 +0100 From: "Martin Buchholz" <Martin.Buchholz@....COM> To: <kbo@....tiscali.de> Cc: srevilak@...akeasy.net, James Youngman <bugtraq@...ession.spiral-arm.org>, parimiv@...haw.com, levon@...ementarian.org, bugtraq@...urityfocus.com, bug-findutils@....org Subject: Re: Changes to the filesystem while find is running - comments? Casper.Dik@....COM wrote: >>I can see that that would be useful but it would fail to comply with >>the POSIX standard, which specifies: >> >> The find utility shall be able to descend to arbitrary >> depths in a file hierarchy and shall not fail due to path >> length limitations (unless a path operand specified by the >> application exceeds {PATH_MAX} requirements) > > But PATH_MAX is limited and the number of file descriptors is perhaps > not. > > (On Solaris, PATH_MAX is 1024 so you require at most 512 file > descriptors to keep the stack of directories: 512 is less than the > default hard limit of 65536 file descriptors per process [S9, S8 > and before used 1024, still >> 512) My reading of the above paragraph from the POSIX standard is that find is required to be able to traverse arbitrary depths, even when the resulting path length exceeds PATH_MAX. On my Solaris 9 system, the default file descriptor limit appears to be 256. I am genuinely surprised that Solaris still has such a relatively small PATH_MAX. Linux has 4096. Like other arbitrary system limits of its ilk, PATH_MAX is evil, and is one of the more persuasive arguments for getting rid of the C language and its fixed-size stack-allocated buffers. char path[PATH_MAX]; /* considered harmful */ Martin > Casper
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