Re: Linux 2.1.131ac5 released

Dax Kelson (peeter_joot@VNET.IBM.COM)
Wed, 9 Dec 1998 00:09:02 -0500 (EST)

> Differences between 2.1.131ac4 and 2.1.131ac5
....
> o Message queues can be bigger and are tunable via /proc (Peeter Joot)
> | Note - this has libc compatibility issues but only if you set the
> | queue sizes bigger than 64K. So the as shipped kernel is back
> | compatible. (if its not shout now)

That's right -- unless I screwed up:)

You could use > 64K queues/messages but without an updated sys/msq_buf.h
you will see truncated values for the msg_cbytes and msg_qbytes
fields of struct msqid_ds in a msgctl call.

These are now also passed back as four byte values in the place of the __wwait
and __rwait parameters -- which are only used in the kernel.

Once these changes are into the "official" kernel distribution I will submit
the changes to the glibc developers to complete the large message support.

Peeter

--
Peeter Joot                                          peeterj@ca.ibm.com
IBM DB2 Operating System Services                    416-448-3359 (tie line 778)


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