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Re: idl process id [message #11623 is a reply to message #11556]

Fri, 24 April 1998 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <353FB8D8.DE9@bial1.ucsd.edu>,
David Foster <foster@bial1.ucsd.edu> wrote:
>> IDL> result=call_external('/lib/libc.so.1.9','getpid')
>> IDL> print,result
>> 23847
>
> Whoa! Does this work in any general sense? Do you have suggestions
> for getting references on which routines are available in which
> libraries? How "safe" is this?

It works for any libc routine that either takes no parameters,
or takes zero or another small integer as the only parameter.
For example time(0) works. That's because call_external uses
an (argc,void *argv[]) calling system. In the above example
the actual call that made is "getpid(0,some_random_pointer)".
Since caller removes the arguments under most systems, this
works as an equivalent of getpid().

As far as where routines are found, most general unix routines
will be in libc. (i.e. anything that doesn't require libraries
to be listed on the command line during a C compile.)

Eric

--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
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[Message index]

		idl process id By: csaute3 on Mon, 20 April 1998 00:00
		Re: idl process id By: korpela on Fri, 24 April 1998 00:00
		Re: idl process id By: David Foster on Thu, 23 April 1998 00:00

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