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From: thomas@uplog.se (Thomas Tornblom)
Newsgroups: comp.unix.wizards,comp.bugs.sys5
Subject: Re: stdio broken in SysV?
Message-ID: <THOMAS.90Mar1150529@uplog.uplog.se>
Date: 1 Mar 90 14:05:29 GMT
References: <2010@sauron.Columbia.NCR.COM> <51697@sgi.sgi.com>
	<0S&#P?$@masalla.fulcrum.bt.co.uk>
Sender: thomas@uplog.se (Thomas Tornblom)
Organization: TeleLOGIC Uppsala AB
Lines: 50
In-Reply-To: igb@fulcrum.bt.co.uk's message of 26 Feb 90 09:32:10 GMT

In article <0S&#P?$@masalla.fulcrum.bt.co.uk> igb@fulcrum.bt.co.uk (Ian G Batten) writes:

   rpw3@rigden.UUCP (Robert P. Warnock) writes:
   > This is a well-known problem to anyone who has ported any Berkeley networking
   > applications to System V. IMHO, Sys5's broken, but it's that way in all the
   > S5R2's I've seen. (Did it make it into S5R3? Will it still be there in S5R4?)

   Yes.  I ported IDA Sendmail to 5.3.2 last week and hit this problem.
   As previously stated, dup()ing the file descriptor is a cure.


If anyone cares, here is the fix to stdio I made. I also came across the
problem while bringing sendmail up.
Requires source of course...
-----------------------------------------------
There is only 3 files that need a change.
/usr/include/stdio.h:
Add a new member last to the FILE struct:
 	unsigned char	*_bufendp;	/* get rid of bufendtab */

redefine the macro _bufend():
	#define _bufend(p)	((p)->_bufendp)

remove the definition of _bufendtab[]

.../src/lib/libc/port/data.c:
add a new initializer to the _iob[] struct for stdin, stdout and stderr:

  FILE _iob[_NFILE] = {
 	{ 0, NULL, NULL, _IOREAD, 0, NULL},
 	{ 0, NULL, NULL, _IOWRT, 1, NULL},
 	{ 0, _smbuf[2], _smbuf[2], _IOWRT+_IONBF, 2, _smbuf[2]+_SBFSIZ},
  };

remove the declaration of _bufendtab[];

.../src/lib/libc/port/print/doprnt.c

There is one place where _bufendtab[fno] is referenced. Change it to
_bufend(iop). This can be done without the other changes.

Then you have to recompile libc.a of course, but thats another story.

Thomas

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