Messages in this thread | | | Subject | Re: linux-kernel-digest V1 #2839 | Date | Mon, 16 Nov 1998 21:44:38 -0500 | From | "Brandon S. Allbery KF8NH" <> |
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In message <XFMail.981116162732.simon@koala.ie>, Simon Kenyon writes: +----- | in 4.2bsd (at least) the environment is/was writable, so a proc can overwrite | its | command line arguments to achieve the same effect. is this not how sendmail d | oes it? +--->8
It's always writeable. But ps doesn't necessarily look at the process's memory space to get the arguments, as that is usually complex (is it swapped?) and always slow. System V-derived Unixes store some part (usually the first 80 characters) of the original command line in the ublock to make ps faster, at the price of some magic required (if it's possible at all) to change that saved command line.
-- brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net system administrator [WAY too many hats] allbery@ece.cmu.edu carnegie mellon / electrical and computer engineering KF8NH Kiss my bits, Billy-boy.
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