How to manage a system call inside Ada ?

How to manage a system call inside Ada ?

[wlz]

Hi,
I want to call an editor inside Ada-Code. Is there a Ada function
like system(..) in C.
I tried to import a C function with this system call. But this failed, the
Ada Linker is missing the label _system.

I hope somebody can help.

thx  - rainer 

Re: How to manage a system call inside Ada ?

[Georg Bauhaus]

On Thu, 2006-11-23 at 17:12 +0100, wlz wrote:
> Hi,
> I want to call an editor inside Ada-Code. Is there a Ada function
> like system(..) in C.

This may depend on compiler and system.

with Interfaces.C;
with Ada.Text_IO; use Ada;

procedure edit is

   package C renames Interfaces.C;

   function system(command: C.char_array) return C.int;
   pragma import(C, system);  -- have the compiler choose the linke name
   --pragma import(C, system, "system");

   rc: C.int;
begin
   rc := system(C.To_C("editor"));

   Text_IO.put_line(Text_IO.current_error,
      "system returns" & C.int'image(rc));
end edit;


> I tried to import a C function with this system call. But this failed, the
> Ada Linker is missing the label _system.
> 
> I hope somebody can help.
> 
> thx  - rainer 
> 
> 

Re: How to manage a system call inside Ada ?

[koburtch]

What operating system are you using?

For linux, detailed instructions using system calls is available in my
online book at

   http://www.pegasoft.ca/resources/boblap/book.html

Ken B.

wlz wrote:
> Hi,
> I want to call an editor inside Ada-Code. Is there a Ada function
> like system(..) in C.
> I tried to import a C function with this system call. But this failed, the
> Ada Linker is missing the label _system.
> 
> I hope somebody can help.
> 
> thx  - rainer

Re: How to manage a system call inside Ada ?

[wlz]

Thanks to Georg and Ken.

Both suggestions works very well.

The Aonix IDE on the Windows machine needs a search path:
               SearchPath: f:\compiler\aonix\objectada\apilib

Rainer.

"wlz" <master@fgg-welzel.de> schrieb im Newsbeitrag 
news:ek4h7g$ph7$01$1@news.t-online.com...
> Hi,
> I want to call an editor inside Ada-Code. Is there a Ada function
> like system(..) in C.
> I tried to import a C function with this system call. But this failed, the
> Ada Linker is missing the label _system.
>
> I hope somebody can help.
>
> thx  - rainer
>