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Date: Tue, 14 Feb 2006 13:44:13 +0800
From: David Xu <davidxu@freebsd.org>
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To: Joseph Koshy <joseph.koshy@gmail.com>
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Cc: Bachilo Dmitry <root@solink.ru>, freebsd-current@freebsd.org
Subject: Re: Bad system call (core dumped)
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Joseph Koshy wrote:
> bd>    800 xchat    CALL  ksem_init(0xbfbfd40c,0x1)
> bd>    800 xchat    RET   ksem_init -1 errno 78 Function not implemented
> bd>    800 xchat    PSIG  SIGSYS SIG_DFL
> bd>    800 xchat    NAMI  "xchat.core"
> 
> bd> Like, I have no some "ksem_init" function in my.... kernel or something?
> 
> dx> You should include "options  P1003_1B_SEMAPHORES" in kernel config
> dx> file, I don't know why such a basic is not in GENERIC.
> 
> sys/conf/NOTES marks it as being 'very experimental'.
> 
> There are three calls to ksem_init() in our library code.   Userland code
> should be checking for kernel support for features before attempting to
> use them.
> 
> --
> FreeBSD Volunteer,     http://people.freebsd.org/~jkoshy
> 
> 
I don't think user code should check it before it can be used,
actually, it is being used by thread libraries to implement named
semaphore, it is requred by POSIX.

David Xu