diff options
Diffstat (limited to 'usr/src')
| -rw-r--r-- | usr/src/lib/libdhcpagent/common/dhcpagent_ipc.h | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/usr/src/lib/libdhcpagent/common/dhcpagent_ipc.h b/usr/src/lib/libdhcpagent/common/dhcpagent_ipc.h index 5dcb6b5b40..be2da33666 100644 --- a/usr/src/lib/libdhcpagent/common/dhcpagent_ipc.h +++ b/usr/src/lib/libdhcpagent/common/dhcpagent_ipc.h @@ -22,6 +22,9 @@ * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ +/* + * Copyright (c) 2013, 2015 by Delphix. All rights reserved. + */ #ifndef _DHCPAGENT_IPC_H #define _DHCPAGENT_IPC_H @@ -255,8 +258,13 @@ typedef hrtime_t dhcp_ipc_id_t; /* * note: the first 4 fields of the dhcp_ipc_request_t and dhcp_ipc_reply_t * are intentionally identical; code in dhcpagent_ipc.c counts on it! + * + * we pack these structs to ensure that their lengths will be identical between + * 32-bit and 64-bit executables. */ +#pragma pack(4) + struct dhcp_ipc_request { dhcp_ipc_type_t message_type; /* type of request */ dhcp_ipc_id_t ipc_id; /* per-socket unique request id */ @@ -276,13 +284,10 @@ struct dhcp_ipc_reply { uchar_t buffer[1]; /* dynamically extended */ }; -/* - * since ansi c won't let us define arrays with 0 elements, the - * size of the ipc request/reply structures is off-by-1; use macros. - */ +#pragma pack() -#define DHCP_IPC_REPLY_SIZE (sizeof (dhcp_ipc_reply_t) - 1) -#define DHCP_IPC_REQUEST_SIZE (sizeof (dhcp_ipc_request_t) - 1) +#define DHCP_IPC_REPLY_SIZE offsetof(dhcp_ipc_reply_t, buffer) +#define DHCP_IPC_REQUEST_SIZE offsetof(dhcp_ipc_request_t, buffer) #define DHCP_IPC_DEFAULT_WAIT 120 /* seconds */ |