From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <c6a62e7956a7feccb4e42c877569d5ae@quintile.net>
From: "Steve Simon" <steve@quintile.net>
Date: Fri, 25 Jul 2008 12:15:39 +0100
To: 9fans@9fans.net
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Subject: [9fans] kernel, errfmt
Topicbox-Message-UUID: f019f3c6-ead3-11e9-9d60-3106f5b1d025

Hi,

I have become confused trying to understand
the kernel's linkage.

the kernel uses print() in many places, e.g.
/sys/src/9/port/xalloc.c:80

/sys/src/9/port/devcons.c:211 This calls vseprint().

/sys/src/libc/fmt/fmt.c:47 The fmt library installs %r
(errfmt) by default.

/sys/src/libc/fmt/errfmt.c:10 references rerrstr().

/sys/src/libc/9sys/rerrstr.c:10 references errstr().

Errstr() is a system call and does not exist in the
kernel (where it becomes syserrstr()).

How can this work? ...or does the kernel itself
perform system calls?

-Steve