I am trying to extract the absolute full path of executing processes from the proc file system by reading the  file  the
 /proc/pid/as using devctl.

struct dinfo_s {
    	    procfs_debuginfo info;
    	    char pathbuffer[PATH_MAX];
    	};
    struct dinfo_s  dinfo;
    sprintf( buffer, "/proc/%d/as", pid );
	if ((fd = open( buffer, O_RDONLY )) != NULL)
	{
		status = devctl( fd, DCMD_PROC_MAPDEBUG_BASE, &dinfo, sizeof(dinfo), NULL );
		printf("path  %s \n", dinfo.info.path);
        }

But the path info I get is the relative path which is dependent on the launchpoint of the process i.e if an exe is 
launched as ./app1 , its full path shows as ./app1 instead of its absolute path .

How do I extract the absolute path of a running process ?