Hello sir,
The more I dive into the code (of quagga, not ldp) the more I found it
really really tricky. The most difficult part was to understand how
the interface worked. And I figured out that DEFUN was used :
/* DEFUN for vty command interafce. Little bit hacky ;-). */
#define DEFUN(funcname, cmdname, cmdstr, helpstr) \
DEFUN_CMD_FUNC_DECL(funcname) \
DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, 0, 0) \
DEFUN_CMD_FUNC_TEXT(funcname)
Which means :
#define DEFUN_CMD_FUNC_DECL(funcname) \
static int funcname (struct cmd_element *, struct vty *, int, const char *[]);
#define DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, attrs, dnum) \
struct cmd_element cmdname = \
{ \
.string = cmdstr, \
.func = funcname, \
.doc = helpstr, \
.attr = attrs, \
.daemon = dnum, \
};
#define DEFUN_CMD_FUNC_TEXT(funcname) \
static int funcname \
(struct cmd_element *self __attribute__ ((unused)), \
struct vty *vty __attribute__ ((unused)), \
int argc __attribute__ ((unused)), \
const char *argv[] __attribute__ ((unused)) )
To see how the macro is used according to the interface for quagga's
usage of ldp-portable, maybe an example would be nice :
This is the first example you can find in quagga-mpls/ldpd/ldp_vty.c
DEFUN (mpls_ldp,
mpls_ldp_cmd,
"mpls ldp",
"Global MPLS configuration\n"
"Dynamic Label distribution via LDP\n")
{
vty->node = LDP_NODE;
vty->index = ldp_get();
if (!vty->index) {
if (!(vty->index = ldp_new())) {
vty_out (vty, "Unable to create LDP instance.%s", VTY_NEWLINE);
return CMD_WARNING;
}
}
return CMD_SUCCESS;
}
And my question is : what is "mpls_ldp" or any other functions
declared by the DEFUN macro? Is this a command we can use on the
interface?
Thank you for your help.
Julien
--
--------------------------------------------
Julien BISCONTI <julien.bisconti(at)student.fundp.ac.be>
M.Sc. student in Computer Science, University of Namur
FUNDP, Belgium
Traineeship: UPC (Barcelona, Spain)
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