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udhcpc: add/edit comments, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-07-19 04:24:23 +02:00
parent 13ca4b12e2
commit 7d6a791ef6
1 changed files with 13 additions and 5 deletions
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18
networking/udhcp/dhcpc.c
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@ -29,7 +29,7 @@ static smallint listen_mode;
#define REQUESTING 1 #define REQUESTING 1
/* select/renew was sent, DHCPACK reply received */ /* select/renew was sent, DHCPACK reply received */
#define BOUND 2 #define BOUND 2
/* half of lease passed, want renew it by sending unicast renew requests */ /* half of lease passed, want to renew it by sending unicast renew requests */
#define RENEWING 3 #define RENEWING 3
/* renew requests were not answered, lease is almost over, send broadcast renew */ /* renew requests were not answered, lease is almost over, send broadcast renew */
#define REBINDING 4 #define REBINDING 4
@ -424,7 +424,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
state = INIT_SELECTING; state = INIT_SELECTING;
goto leasefail; goto leasefail;
case BOUND: case BOUND:
/* Half of the lease passed, time to enter renewing state */ /* 1/2 lease passed, enter renewing state */
state = RENEWING; state = RENEWING;
change_listen_mode(LISTEN_KERNEL); change_listen_mode(LISTEN_KERNEL);
log1("Entering renew state"); log1("Entering renew state");
@ -433,7 +433,15 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
case_RENEW_REQUESTED: case_RENEW_REQUESTED:
case RENEWING: case RENEWING:
if (timeout > 60) { if (timeout > 60) {
/* send an unicast renew request packet */ /* send an unicast renew request */
/* Sometimes observed to fail (EADDRNOTAVAIL) to bind
* a new UDP socket for sending inside send_renew.
* I hazard to guess existing listening socket
* is somehow conflicting with it, but why is it
* not deterministic then?! Strange.
* Anyway, it does recover by eventually failing throigh
* into INIT_SELECTING state.
*/
send_renew(xid, server_addr, requested_ip); send_renew(xid, server_addr, requested_ip);
timeout >>= 1; timeout >>= 1;
continue; continue;
@ -446,7 +454,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
/* Lease is *really* about to run out, /* Lease is *really* about to run out,
* try to find DHCP server using broadcast */ * try to find DHCP server using broadcast */
if (timeout > 0) { if (timeout > 0) {
/* send a broadcast renew request packet */ /* send a broadcast renew request */
send_renew(xid, 0 /*INADDR_ANY*/, requested_ip); send_renew(xid, 0 /*INADDR_ANY*/, requested_ip);
timeout >>= 1; timeout >>= 1;
continue; continue;
@ -477,7 +485,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
goto case_RENEW_REQUESTED; goto case_RENEW_REQUESTED;
/* Start things over */ /* Start things over */
packet_num = 0; packet_num = 0;
/* Kill any timeouts because the user wants this to hurry along */ /* Kill any timeouts, user wants this to hurry along */
timeout = 0; timeout = 0;
continue; continue;
case SIGUSR2: case SIGUSR2: