From: Victor Manuel Reyes Viloria <vmreyes@...>
Date: 2002-04-24T03:02:23+09:00
Subject: Re: Hostname command


Perhaps I don't know what you guys are talking about, but I get my windows
hostname with either one of these expressions:

hn = system("hostname")
puts hn

or the following":

puts system("hostname")

Victor


|---------+---------------------------->
|         |           djberg96@hotmail.|
|         |           com (Daniel      |
|         |           Berger)          |
|         |                            |
|         |           04/23/2002 01:15 |
|         |           PM               |
|         |           Please respond to|
|         |           ruby-talk        |
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  |       To:       ruby-talk@ruby-lang.org (ruby-talk ML)                                                                                      |
  |       cc:                                                                                                                                   |
  |       Subject:  Re: Hostname command                                                                                                        |
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ts <decoux@moulon.inra.fr> wrote in message
news:<200204231413.g3NEDbr01417@moulon.inra.fr>...
> >>>>> "D" == Daniel Berger <djberg96@hotmail.com> writes:
>
> D> Is there a 'hostname' command in Ruby (short of backticks, I mean)?
>
>  Well, you can do
>
> pigeon% ruby -rsocket -e 'p Socket.gethostname'
> "pigeon"
> pigeon%
>
>
> Guy Decoux

Hmmm...forgot about that (oops).  Seems like overkill just to get the
hostname, though. Well, I went and wrote an extension anyway, on the
notion that I might add other commands (such as 'mailhost') to it
someday.  Here it is.  It's not Windows friendly, and I don't check
the rv on the gethostname call (yet).

In fact, I'm not even sure *how* to get the hostname on Windows (via a
C extension, I mean. I realize that it's probably possible with the
Win32API).  Any help on that would be appreciated.

Enjoy.

Dan

#include "ruby.h"

#if defined(I_UNISTD) && defined(HAS_GETHOSTNAME)
#include <unistd.h>
#endif

/* a reasonable default */
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN        256
#endif

#ifdef I_SYSUTSNAME
#include <sys/utsname.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* set up a struct with the notion of adding other things
   (such as mailhost, etc) in the future */

struct mystruct{
   char* hostname;
};
typedef struct mystruct sys_struct;

VALUE mSys;
VALUE cSys;

static void
sys_free(void* p)
{
   free(p);
}

static VALUE
sys_hostname(VALUE self)
{
   return rb_iv_get(self,"@hostname");
}

static VALUE
sys_init(VALUE self, VALUE hostname)
{
   rb_iv_set(self,"@hostname",hostname);
   return self;
}

VALUE
sys_new(VALUE class)
{
   VALUE argv[1];
   VALUE sdata;
   sys_struct *p;
   char* h;
   int rv;

   sdata = Data_Make_Struct(class,sys_struct,0,sys_free,p);
   rv = gethostname(h,MAXHOSTNAMELEN);
   argv[0] = rb_str_new2(h);
   rb_obj_call_init(sdata,1,argv);
   return sdata;
}

void Init_Sys()
{
   mSys = rb_define_module("sys");
   cSys = rb_define_class("Sys",rb_cObject);

   rb_define_singleton_method(cSys,"new",sys_new,0);
   rb_define_method(cSys,"hostname",sys_hostname,0);
   rb_define_method(cSys,"initialize",sys_init,1);
}

#ifdef __cplusplus
}
#endif
#