Date: Sat, 18 May 2002 16:54:51 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Ian Dowse <iedowse@maths.tcd.ie> Cc: Ian <freebsd@damnhippie.dyndns.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: df Message-ID: <3CE6E9CB.597E0BC@mindspring.com> References: <200205190041.aa04845@salmon.maths.tcd.ie>
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Ian Dowse wrote: > In message <3CE6DFED.8604C72C@mindspring.com>, Terry Lambert writes: > >I think the reason for the "if" is to keep the df from hanging > >indefinitely, particularly when you give it an explicit list. > > No, I believe the "if (vfslist != NULL)" code was there to reduce > the maximum column widths to those necessary for an explicit list > of filesystems rather than using the maximum widths for all > filesystems. The regetmntinfo() call before the "if" has already > performed any operations that could hang indefinitely, so it makes > sense to unconditionally use these up-to-date results instead of > the potentially stale list from getmntinfo(..., MNT_NOWAIT). Like "ps", "df" is a snapshot. As such, "staleness" after a few tenths of a second is really irrelevent, since the information is never really "the real and precise information". It's more important to be able to get information in a misbehaving system, without hanging your shell forever. 8-(. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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