Date: Mon, 13 Sep 1999 19:34:05 -0700 (PDT) From: Bill Fenner <fenner@research.att.com> To: freebsd-questions@freebsd.org Cc: fenner@research.att.com Subject: Why can't I set MSGBUF_SIZE? Message-ID: <199909140234.TAA00595@mango.attlabs.att.com>
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Ok, I'm going completely insane here.
mango% grep MSGBUF /sys/i386/conf/MANGO
options "MSGBUF_SIZE=81920"
mango% cat /sys/compile/MANGO/opt_msgbuf.h
#define MSGBUF_SIZE 81920
/sys/i386/i386/machdep.c:
int bill_is_going_crazy = MSGBUF_SIZE;
#if MSGBUF_SIZE != 81920
#error "It didn't work!"
#endif
...
msgbufinit(msgbufp, MSGBUF_SIZE);
kgdb:
(kgdb) p bill_is_going_crazy
$1 = 81920
so clearly, both because the compilation succeeded and because the
kernel variable is set to what I think it should be, MSGBUF_SIZE
was 81920 at compile time. However,
(kgdb) x/x msgbufp
0xc0416fec: 0x00063062
(kgdb)
0xc0416ff0: 0x00001fec
msg_magic is set to MSG_MAGIC, which is all well and good. msg_size,
however, is 8172 (8192 - sizeof(struct msgbuf)), what you would
expect if MSGBUF_SIZE was 8192 (the default if not overridden -- but
it's clear from the variable bill_is_going_crazy that the override
succeeded).
Someone, please tell me what I'm missing!
Thanks,
Bill
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