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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2009-07-19 04:24:23 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2009-07-19 04:24:23 +0200 |
| commit | 7d6a791ef6c6232afba765c14597153c64fecfc9 (patch) | |
| tree | d92603efcea18b209282567b4f3c93b08e4834e5 /networking/udhcp/dhcpc.c | |
| parent | 13ca4b12e2c7d022a1dcb5a4d9923bb176fe69a7 (diff) | |
| download | busybox-7d6a791ef6c6232afba765c14597153c64fecfc9.tar.gz | |
udhcpc: add/edit comments, no code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking/udhcp/dhcpc.c')
| -rw-r--r-- | networking/udhcp/dhcpc.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index 8b6019bc9..fcc447949 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -29,7 +29,7 @@ static smallint listen_mode; #define REQUESTING 1 /* select/renew was sent, DHCPACK reply received */ #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 /* renew requests were not answered, lease is almost over, send broadcast renew */ #define REBINDING 4 @@ -424,7 +424,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) state = INIT_SELECTING; goto leasefail; case BOUND: - /* Half of the lease passed, time to enter renewing state */ + /* 1/2 lease passed, enter renewing state */ state = RENEWING; change_listen_mode(LISTEN_KERNEL); log1("Entering renew state"); @@ -433,7 +433,15 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) case_RENEW_REQUESTED: case RENEWING: 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); timeout >>= 1; continue; @@ -446,7 +454,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) /* Lease is *really* about to run out, * try to find DHCP server using broadcast */ if (timeout > 0) { - /* send a broadcast renew request packet */ + /* send a broadcast renew request */ send_renew(xid, 0 /*INADDR_ANY*/, requested_ip); timeout >>= 1; continue; @@ -477,7 +485,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) goto case_RENEW_REQUESTED; /* Start things over */ 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; continue; case SIGUSR2: |