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From: karl@grebyn.com (Karl A. Nyberg)
Newsgroups: comp.lang.ada,comp.sys.hp
Subject: Unix (HP-UX) system calls from ADA
Message-ID: <19481@grebyn.com>
Date: 20 Mar 90 21:22:39 GMT
References: <1587@krafla.rhi.hi.is>
Sender: karl@grebyn.com
Followup-To: comp.lang.ada
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In article <1587@krafla.rhi.hi.is> valdi@rhi.hi.is (Thorvaldur Sigurdsson) writes:

%Problem       : Making unix system calls within Ada code
%Background    : HP-UX 6.5, HP 9000/300 series, Alsys 4.35 Ada compiler
%Error message : 
%		ld: Undefined external -
%		      _ll
%		      _clear
%		ld: output file still contains undefined symbols
%		ld: (Warning) did not generate an output file
%		ada: Errors detected
%
%	       "When you want to call an HP-UX system call from Ada
%		code, you should use a pragma INTERFACE with C as the
%		language name.  It is not necassary to provide the C
%		object file to the binder, because it will be found 
%		automatically when the linker searches the system
%		library".
%
%Question      : Is the manual wrong concerning automatic linking or
%		am I doing something wrong in the code ?
%

My guess is you are trying to use not SYSTEM calls, but calls to units in
some particular libraries (e.g. curses?).  In those cases, you will need to
include the C object file to the binder (possibly the archive file?) to
resolve those names.

Or, are you trying to use the shell commands "clear" and "ls -l"?  In which
case you're asking an entirely different set of questions, for which the
answer is a convoluted use of either the "system" call (if it exists on your
machine) or getting an interface to fork and/or exec.

-- Karl --