From: Mike Haertel <mike@ducky.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] the declaration of main()
Date: Thu, 26 Apr 2001 12:17:47 -0700 [thread overview]
Message-ID: <200104261917.f3QJHlG03409@ducky.net> (raw)
In-Reply-To: <20010426182650.3DDB3199D7@mail.cse.psu.edu>
Forsyth wrote:
>cpu% cat s4/crt0.s
>/ C runtime startoff
Note that Forsyth's example is from 6th edition Unix, not 7th edition.
(The "s4/" in the source file name is a dead giveaway.)
Here's the corresponding code fragment from 7th edition
/usr/src/libc/csu/crt0.s:
1:
mov r0,4(sp)
mov r0,_environ
jsr pc,_main
cmp (sp)+,(sp)+
mov r0,(sp)
jsr pc,*$_exit
sys exit
Here the int return value from main does indeed become the exit status.
C didn't really become widely used until after the 7th edition, and
v7 C is really the ancestral root of most other implementations. It is
also the version of the language that most nearly coincided with the
publication of the 1st edition of "The C Programming Language".
next prev parent reply other threads:[~2001-04-26 19:17 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-26 18:23 forsyth
2001-04-26 19:17 ` Mike Haertel [this message]
2001-04-26 23:50 ` Boyd Roberts
2001-04-27 14:41 ` Douglas A. Gwyn
2001-04-27 15:40 ` Boyd Roberts
2001-04-27 9:12 ` Douglas A. Gwyn
-- strict thread matches above, loose matches on Subject: below --
2001-04-30 12:05 rob pike
2001-04-30 10:44 forsyth
2001-04-28 18:44 forsyth
2001-04-30 9:24 ` Douglas A. Gwyn
2001-04-28 17:57 forsyth
2001-04-28 22:28 ` Dan Cross
2001-04-30 9:25 ` Douglas A. Gwyn
2001-04-27 6:57 nemo
2001-04-26 20:58 forsyth
2001-04-27 9:13 ` Douglas A. Gwyn
2001-04-27 14:48 ` Boyd Roberts
2001-04-27 16:22 ` Douglas A. Gwyn
2001-04-27 18:24 ` William K. Josephson
2001-04-30 9:23 ` Douglas A. Gwyn
2001-04-27 19:38 ` Boyd Roberts
2001-04-28 15:54 ` Greg Hudson
2001-04-28 16:39 ` Dan Cross
2001-04-28 17:06 ` Boyd Roberts
2001-04-30 9:25 ` Douglas A. Gwyn
2001-04-26 19:42 Russ Cox
2001-04-26 20:32 ` Dan Cross
2001-04-26 22:03 ` Boyd Roberts
2001-04-27 9:13 ` Douglas A. Gwyn
2001-04-24 10:32 rog
2001-04-24 18:03 ` Steve Kilbane
2001-04-24 8:10 forsyth
2001-04-26 15:55 ` Douglas A. Gwyn
2001-04-24 0:59 okamoto
2001-04-24 3:08 ` Boyd Roberts
2001-04-23 19:33 dmr
2001-04-23 11:09 forsyth
2001-04-23 11:31 ` Boyd Roberts
2001-04-24 9:02 ` Douglas A. Gwyn
2001-04-24 12:09 ` Boyd Roberts
2001-04-26 16:05 ` Douglas A. Gwyn
2001-04-26 18:12 ` Boyd Roberts
2001-04-26 23:55 ` Boyd Roberts
2001-04-24 17:43 ` Greg Hudson
2001-04-26 15:55 ` Douglas A. Gwyn
2001-04-12 6:28 okamoto
2001-04-23 8:44 ` Douglas A. Gwyn
2001-04-23 8:48 ` Boyd Roberts
2001-04-12 6:22 YAMANASHI Takeshi
2001-04-12 6:25 ` andrey mirtchovski
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