Messages in this thread | | | Date | Thu, 18 Mar 1999 23:03:08 -0500 | From | Arvind Sankar <> | Subject | Re: Bug in kill? |
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On Thu, Mar 18, 1999 at 04:03:36PM -0800, rich-paul@rich-paul.net wrote: > There seems to be a bug in kill ... or it's a documentation bug, I'm not > sure which. > > As I undertstand it, > > kill(pid,0) should return 0 only if process #pid exists ... however, it > seems to be returning 0 no matter what ... so one can't use it to test > the existance of a process. :( > > This would be useful when starting a daemon, among other things ... read > the .pid file, and if kill(pid,0) returns an ESRCH, then just delete the > file, since the process is no longer running. > > Is my reading wrong?
no. your code might be. It certainly does return -1 and sets errno = ESRCH here. (kernel 2.2.3, glibc2.1).
-- arvind
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