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From: dce@mips.UUCP (David Elliott)
Newsgroups: comp.unix.questions
Subject: Re: csh on ULTRIX
Message-ID: <346@quacky.UUCP>
Date: Mon, 27-Apr-87 00:08:09 EDT
Article-I.D.: quacky.346
Posted: Mon Apr 27 00:08:09 1987
Date-Received: Tue, 28-Apr-87 01:15:05 EDT
References: <7107@brl-adm.ARPA>
Reply-To: dce@quacky.UUCP (David Elliott)
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 75

In article <7107@brl-adm.ARPA> Isidore Bendrihem@BRL.ARPA writes:
>Has anybody succesfully ported the 4.3bsd C shell to Ultrix 1.2 (on an 8600)?
>I was able to compile csh without any problems.  Although it seems to
>be able to parse commands, it fails to execute them, returning instead the
>normal user prompt.

I did, last summer. The problem is that in 4.3BSD, you are guaranteed
to have stdin, stdout, and stderr opened for you upon exec (I think
this is what I learned). Anyway, code was added to set all of the
standard descriptors to be "close-on-exec", and that doesn't work in
4.2BSD or Ultrix 1.2.

Apply the following patch (note that BSD4_3 is automatically defined
if you are using 4.3BSD, since the csh source includes <sys/param.h>).

*** sh.c.old
--- sh.c
***************
*** 203,209 ****
--- 204,212 ----
  		}
  		file = v[0];
  		SHIN = dmove(nofile, FSHIN);	/* Replace FSHIN */
+ #ifdef BSD4_3
  		(void) ioctl(SHIN, FIOCLEX, (char *)0);
+ #endif
  		prompt = 0;
  		c--, v++;
  	}
***************
*** 427,433 ****
--- 430,438 ----
  	register char *ep = strspl(cp, dp);
  	register int unit = dmove(open(ep, 0), -1);
  
+ #ifdef BSD4_3
  	(void) ioctl(unit, FIOCLEX, (char *)0);
+ #endif
  	xfree(ep);
  #ifdef INGRES
  	srcunit(unit, 0, 0);
***************
*** 828,834 ****
--- 833,841 ----
  	xfree(f);
  	if (u < 0 && !hflg)
  		Perror(f);
+ #ifdef BSD4_3
  	(void) ioctl(u, FIOCLEX, (char *)0);
+ #endif
  	srcunit(u, 0, hflg);
  }
  
***************
*** 903,912 ****
--- 910,926 ----
  {
  
  	didfds = 0;			/* 0, 1, 2 aren't set up */
+ #ifdef BSD4_3
  	(void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, (char *)0);
  	(void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, (char *)0);
  	(void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, (char *)0);
  	(void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, (char *)0);
+ #else
+ 	SHIN = dcopy(0, FSHIN);
+ 	SHOUT = dcopy(1, FSHOUT);
+ 	SHDIAG = dcopy(2, FSHDIAG);
+ 	OLDSTD = dcopy(SHIN, FOLDSTD);
+ #endif
  	closem();
  }
  
-- 
David Elliott		{decvax,ucbvax,ihnp4}!decwrl!mips!dce