get full route executable controlling slight hpux

i wish full route controlling slight (executable) but carrying bottom assent controlling c++ code. someone advise proceed grasp this.

on linux platforms i controlling following way.

char exepath[1024] = {0};
char procid[1024] = {0};
char exelink[1024] = {0};

sprintf(procid, "%u", getpid());

strcpy(exelink, "/proc/");
strcat(exelink, procid);
strcat(exelink, "/exe");

readlink(exelink, exepath, sizeof(exepath));

here exepath gives us full route executable.

similarly windows controlling

getmodulefilename(null, exepath, sizeof(exepath));  /* fullpath use */

please assistance me hp-ux given there /proc office hp-ux.