Date: Fri, 27 Oct 1995 16:33:51 -0400 From: "Garrett A. Wollman" <wollman@lcs.mit.edu> To: Terry Lambert <terry@lambert.org> Cc: hackers@freebsd.org Subject: Re: SYSCALL IDEAS [Was: cvs commit: src/sys/kern sysv_msg.c sysv_sem.c sysv_shm.c] Message-ID: <9510272033.AA23654@halloran-eldar.lcs.mit.edu> In-Reply-To: <199510272009.NAA23809@phaeton.artisoft.com> References: <199510271903.FAA24658@godzilla.zeta.org.au> <199510272009.NAA23809@phaeton.artisoft.com>
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[CC list trimmed. I don't read -hackers.] <<On Fri, 27 Oct 1995 13:09:46 -0700 (MST), Terry Lambert <terry@lambert.org> said: > But this implies that if there is not a prototype in scope, a function > that uses a type that is not correct without a prototype in scope should > not generate a bogus call reference. Not at all. IT IS THE CALLER'S RESPONSIBILITY TO PASS THE CORRECT TYPES AND ALWAYS HAS BEEN. In particular, it is incorrect to call lseek() with a `where' argument of any type other than `off_t', and if a prototype is not in scope, the the programmer damn well better use a cast to ensure that the correct type is being used. >> [Bruce wrote:] >> Consider a 68K compiler that passes the first 2 pointer args (if any) >> in a0-a1 and the first 2 integer args (if any) in d0-d1 and the other >> args on the stack. How are you going to push the args in syscall()? >> Hint: you'll need to know the arg types of all syscalls. > That's an evil way to pass arguments, then. 8-(. That's a fast way to pass arguments on a slow architecture. If you don't like it, tough, because I /know/ that there are compilers out there that do this, or something nearly like it. (And don't forget the SPARC, where under Sun's compiler all aggregates are passed by hidden reference.) -GAWollman -- Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ... wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance. Opinions not those of| It is a bond more powerful than absence. We like people MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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