Getting full filename in Ultrix

[Marwan A. Jabri, Sydney Univ. Elec. Eng., Tel: +61-2 692 2240]

Is anybody aware of a system call under ultrix that would return the full
pathname of a file (including directory path) given the filename
(something similar to realpath under SunOS).

Thanks in advance,

Marwan Jabri
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Marwan Jabri, PhD			  Email: marwan at ee.su.oz.au
Systems Engineering and Design Automation     Tel: (+61-2) 692-2240
  Laboratory (SEDAL)		 	      Fax: (+61-2) 692-3847