Date: Mon, 17 Jun 1996 11:57:56 -0400 From: Garrett Wollman <wollman@lcs.mit.edu> To: James Raynard <fcurrent@jraynard.demon.co.uk> Cc: bde@zeta.org.au, freebsd-current@freebsd.org, j@uriah.heep.sax.de, nate@sri.MT.net Subject: Re: ktrace [Was: 2.2-960612-SNAP resolver problems] Message-ID: <9606171557.AA01047@halloran-eldar.lcs.mit.edu> In-Reply-To: <199606170030.AAA10445@jraynard.demon.co.uk> References: <199606160211.MAA00203@godzilla.zeta.org.au> <199606170030.AAA10445@jraynard.demon.co.uk>
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<<On Mon, 17 Jun 1996 00:30:38 GMT, James Raynard <fcurrent@jraynard.demon.co.uk> said: > Indeed. Apart from volume of output, is there any particular reason > why ktrace writes to a file which kdump reads in, as opposed to using > a pipe? Particularly as the first thing kdump does is > freopen(tracefile, "r", stdin)! 1) The ktrace(2) system call takes a filename as its argument, not a descriptor. 2) The present approach has the advantage of not disturbing the file descriptor table of the process being debugged, so that heisenbug effects are less likely to occur. -GAWollman -- Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ... wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance. Opinions not those of| It is a bond more powerful than absence. We like people MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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