freebsd-ports/net/cnet/files/compile.c

#include <dlfcn.h>
#include <nlist.h>

static int add_compile_args(int ac, char *av[], int kflag)
{
    av[ac++] =	"-fPIC";
    return(ac);
}


static int add_link_args(int ac, char *av[], int kflag)
{
    av[ac++] =	findenv("CNETLD", CNETLD);
    av[ac++] =	"ld";
    av[ac++] =	"-shared";
    return(ac);
}


static void data_segments(int n, void *handle, char *so_filenm)
{
    extern int	 	nlist(const char *, struct nlist *);

    typedef struct _c {
	char		*so_filenm;
	unsigned long	length_data;
	char		*incore_data;
	char		*original_data;
	struct _c	*next;
    } CACHE;

    static CACHE	*chd = (CACHE *)NULL;
    CACHE		*cp  = chd;

    NODE		*np	= &NP[n];
    struct nlist	nls[3];

    while(cp != (CACHE *)NULL) {
	if(strcmp(cp->so_filenm, so_filenm) == 0)
	    goto found;
	cp	= cp->next;
    }

    nls[0].n_name	= "__DYNAMIC";
    nls[1].n_name	= "_end";
    nls[2].n_name	= (char *)NULL;

    if(nlist(so_filenm, nls) != 0) {
	fprintf(stderr,"%s: cannot load symbols from %s\n",
					argv0,so_filenm);
	++nerrors;
	return;
    }

    cp			= (CACHE *)malloc(sizeof(CACHE));
    cp->so_filenm	= strdup(so_filenm);
    cp->length_data	= (nls[1].n_value - nls[0].n_value);
    cp->incore_data	= (char *)((long)dlsym(handle,"end") - cp->length_data);
    cp->original_data	= (char *)malloc(cp->length_data);
    memcpy(cp->original_data, cp->incore_data, cp->length_data);
    cp->next		= chd;
    chd			= cp;

    if(vflag)
	fprintf(stderr,"%s dataseg=0x%08lx len(dataseg)=%ld\n",
			    so_filenm, (long)cp->incore_data, cp->length_data);
found:

    np->length_data[0]		= cp->length_data;
    np->incore_data[0]		= cp->incore_data;
    np->original_data[0]	= cp->original_data;

    np->private_data[0]		= (char *)malloc(cp->length_data);
    memcpy(np->private_data[0], cp->original_data, cp->length_data);
}