Date: Thu, 27 Jun 1996 22:40:19 +1000 From: Bruce Evans <bde@zeta.org.au> To: hackers@freebsd.com, jau@jau.csc.fi Subject: Re: POSIX.4 signals + other POSIX.4 stuff to FreeBSD... Message-ID: <199606271240.WAA10241@godzilla.zeta.org.au>
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> the kernel though. The kernel seems still to be infested with > fragments of code that assume sigset_t is a simple integer > type ANDing and ORing bits in the sigset_t variables instead > of using the POSIX.1 macros to manipulate the signal sets. The kernel is allowed to do this as an optimization since it knows that sigset_t is an unsigned int in the "machine-independent" file <sys/signal.h>. The POSIX macros require the sigset_t to be indirect so they are likely to be unnecessarily inefficient. > containing such an array. I have now more or less figured out > all these code fragments within the kernel itself, but it seems > that also the Linux application binary interface etc. LKMs have More importantly, the size of a sigset_t is appart of the BSD binary interface. The kernel would have to support variably-sized sigset_t's to support old binaries :-(. There is no such thing as a variably-sized struct, and the current sigset_t doesn't encode its size, this isn't easy. Bruce
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