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Commit 4556681e authored by Michael Graff's avatar Michael Graff
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snapshot socket.[ch] code and commit dynbuf_t -> buffer_t changes

parent 45a16841
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bin/named/include/named/query.h
View file @ 4556681e
......@@ -36,7 +36,7 @@ struct ns_query {
dns_name_t * qname;
dns_name_t * origqname;
unsigned int dboptions;
ISC_LIST(isc_dynbuffer_t) namebufs;
isc_bufferlist_t namebufs;
ISC_LIST(dns_name_t) tmpnames;
ISC_LIST(dns_rdataset_t) tmprdatasets;
ISC_LIST(ns_dbversion_t) activeversions;
......
bin/named/query.c
View file @ 4556681e
......@@ -50,7 +50,7 @@
static inline void
query_reset(ns_client_t *client, isc_boolean_t everything) {
isc_dynbuffer_t *dbuf, *dbuf_next;
isc_buffer_t *dbuf, *dbuf_next;
ns_dbversion_t *dbversion, *dbversion_next;
unsigned int i;
......@@ -97,7 +97,7 @@ query_reset(ns_client_t *client, isc_boolean_t everything) {
dbuf_next = ISC_LIST_NEXT(dbuf, link);
if (dbuf_next != NULL || everything) {
ISC_LIST_UNLINK(client->query.namebufs, dbuf, link);
isc_dynbuffer_free(client->mctx, &dbuf);
isc_buffer_free(&dbuf);
}
}
/*
......@@ -126,7 +126,7 @@ ns_query_free(ns_client_t *client) {
static inline isc_result_t
query_newnamebuf(ns_client_t *client) {
isc_dynbuffer_t *dbuf;
isc_buffer_t *dbuf;
isc_result_t result;
/*
......@@ -134,8 +134,8 @@ query_newnamebuf(ns_client_t *client) {
*/
dbuf = NULL;
result = isc_dynbuffer_allocate(client->mctx, &dbuf, 1024,
ISC_BUFFERTYPE_BINARY);
result = isc_buffer_allocate(client->mctx, &dbuf, 1024,
ISC_BUFFERTYPE_BINARY);
if (result != ISC_R_SUCCESS)
return (result);
ISC_LIST_APPEND(client->query.namebufs, dbuf, link);
......@@ -143,9 +143,9 @@ query_newnamebuf(ns_client_t *client) {
return (ISC_R_SUCCESS);
}
static inline isc_dynbuffer_t *
static inline isc_buffer_t *
query_getnamebuf(ns_client_t *client) {
isc_dynbuffer_t *dbuf;
isc_buffer_t *dbuf;
isc_result_t result;
isc_region_t r;
......@@ -162,20 +162,20 @@ query_getnamebuf(ns_client_t *client) {
dbuf = ISC_LIST_TAIL(client->query.namebufs);
INSIST(dbuf != NULL);
isc_buffer_available(&dbuf->buffer, &r);
isc_buffer_available(dbuf, &r);
if (r.length < 255) {
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS)
return (NULL);
dbuf = ISC_LIST_TAIL(client->query.namebufs);
isc_buffer_available(&dbuf->buffer, &r);
isc_buffer_available(dbuf, &r);
INSIST(r.length >= 255);
}
return (dbuf);
}
static inline void
query_keepname(ns_client_t *client, dns_name_t *name, isc_dynbuffer_t *dbuf) {
query_keepname(ns_client_t *client, dns_name_t *name, isc_buffer_t *dbuf) {
isc_region_t r;
/*
......@@ -186,7 +186,7 @@ query_keepname(ns_client_t *client, dns_name_t *name, isc_dynbuffer_t *dbuf) {
REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) != 0);
dns_name_toregion(name, &r);
isc_buffer_add(&dbuf->buffer, r.length);
isc_buffer_add(dbuf, r.length);
dns_name_setbuffer(name, NULL);
client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
}
......@@ -211,7 +211,7 @@ query_releasename(ns_client_t *client, dns_name_t **namep) {
}
static inline dns_name_t *
query_newname(ns_client_t *client, isc_dynbuffer_t *dbuf,
query_newname(ns_client_t *client, isc_buffer_t *dbuf,
isc_buffer_t *nbuf)
{
dns_name_t *name;
......@@ -227,7 +227,7 @@ query_newname(ns_client_t *client, isc_dynbuffer_t *dbuf,
return (NULL);
} else
ISC_LIST_UNLINK(client->query.tmpnames, name, link);
isc_buffer_available(&dbuf->buffer, &r);
isc_buffer_available(dbuf, &r);
isc_buffer_init(nbuf, r.base, r.length, ISC_BUFFERTYPE_BINARY);
dns_name_init(name, NULL);
dns_name_setbuffer(name, nbuf);
......@@ -353,7 +353,7 @@ query_addadditional(void *arg, dns_name_t *name, dns_rdatatype_t type) {
dns_name_t *fname, *mname;
dns_rdataset_t *rdataset, *sigrdataset;
dns_section_t section;
isc_dynbuffer_t *dbuf;
isc_buffer_t *dbuf;
isc_buffer_t b;
dns_dbversion_t *version;
......@@ -544,7 +544,7 @@ query_addrdataset(ns_client_t *client, dns_name_t *fname,
static inline void
query_addrrset(ns_client_t *client, dns_name_t **namep,
dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp,
isc_dynbuffer_t *dbuf, dns_section_t section)
isc_buffer_t *dbuf, dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdataset_t *rdataset, *mrdataset, *sigrdataset;
......@@ -767,7 +767,7 @@ query_find(ns_client_t *client) {
unsigned int restarts, qcount, n, nlabels, nbits;
dns_namereln_t namereln;
int order;
isc_dynbuffer_t *dbuf;
isc_buffer_t *dbuf;
isc_region_t r;
isc_buffer_t b;
isc_result_t result, eresult;
......
lib/dns/include/dns/message.h
View file @ 4556681e
......@@ -130,7 +130,7 @@ struct dns_message {
dns_compress_t cctx;
isc_mem_t *mctx;
ISC_LIST(isc_dynbuffer_t) scratchpad;
isc_bufferlist_t scratchpad;
ISC_LIST(dns_msgblock_t) names;
ISC_LIST(dns_msgblock_t) rdatas;
ISC_LIST(dns_msgblock_t) rdatasets;
......
lib/dns/message.c
View file @ 4556681e
......@@ -164,10 +164,10 @@ static inline dns_result_t
newbuffer(dns_message_t *msg, unsigned int size)
{
isc_result_t result;
isc_dynbuffer_t *dynbuf;
isc_buffer_t *dynbuf;
dynbuf = NULL;
result = isc_dynbuffer_allocate(msg->mctx, &dynbuf, size,
result = isc_buffer_allocate(msg->mctx, &dynbuf, size,
ISC_BUFFERTYPE_BINARY);
if (result != ISC_R_SUCCESS)
return (DNS_R_NOMEMORY);
......@@ -179,12 +179,12 @@ newbuffer(dns_message_t *msg, unsigned int size)
static inline isc_buffer_t *
currentbuffer(dns_message_t *msg)
{
isc_dynbuffer_t *dynbuf;
isc_buffer_t *dynbuf;
dynbuf = ISC_LIST_TAIL(msg->scratchpad);
INSIST(dynbuf != NULL);
return (&dynbuf->buffer);
return (dynbuf);
}
static inline void
......@@ -409,7 +409,7 @@ static void
msgreset(dns_message_t *msg, isc_boolean_t everything)
{
dns_msgblock_t *msgblock, *next_msgblock;
isc_dynbuffer_t *dynbuf, *next_dynbuf;
isc_buffer_t *dynbuf, *next_dynbuf;
dns_rdataset_t *rds;
dns_name_t *name;
dns_rdata_t *rdata;
......@@ -454,13 +454,13 @@ msgreset(dns_message_t *msg, isc_boolean_t everything)
dynbuf = ISC_LIST_HEAD(msg->scratchpad);
INSIST(dynbuf != NULL);
if (!everything) {
isc_dynbuffer_reset(dynbuf);
isc_buffer_clear(dynbuf);
dynbuf = ISC_LIST_NEXT(dynbuf, link);
}
while (dynbuf != NULL) {
next_dynbuf = ISC_LIST_NEXT(dynbuf, link);
ISC_LIST_UNLINK(msg->scratchpad, dynbuf, link);
isc_dynbuffer_free(msg->mctx, &dynbuf);
isc_buffer_free(&dynbuf);
dynbuf = next_dynbuf;
}
......@@ -550,7 +550,7 @@ dns_message_create(isc_mem_t *mctx, unsigned int intent, dns_message_t **msgp)
dns_message_t *m;
isc_result_t iresult;
dns_msgblock_t *msgblock;
isc_dynbuffer_t *dynbuf;
isc_buffer_t *dynbuf;
unsigned int i;
REQUIRE(mctx != NULL);
......@@ -580,8 +580,8 @@ dns_message_create(isc_mem_t *mctx, unsigned int intent, dns_message_t **msgp)
ISC_LIST_INIT(m->freerdatalist);
dynbuf = NULL;
iresult = isc_dynbuffer_allocate(mctx, &dynbuf, SCRATCHPAD_SIZE,
ISC_BUFFERTYPE_BINARY);
iresult = isc_buffer_allocate(mctx, &dynbuf, SCRATCHPAD_SIZE,
ISC_BUFFERTYPE_BINARY);
if (iresult != ISC_R_SUCCESS)
goto cleanup1;
ISC_LIST_APPEND(m->scratchpad, dynbuf, link);
......@@ -629,7 +629,7 @@ dns_message_create(isc_mem_t *mctx, unsigned int intent, dns_message_t **msgp)
msgblock_free(mctx, msgblock, sizeof(dns_name_t));
cleanup2:
dynbuf = ISC_LIST_HEAD(m->scratchpad);
isc_dynbuffer_free(mctx, &dynbuf);
isc_buffer_free(&dynbuf);
cleanup1:
m->magic = 0;
isc_mem_put(mctx, m, sizeof(dns_message_t));
......
lib/dns/tsig.c
View file @ 4556681e
......@@ -16,7 +16,7 @@
*/
/*
* $Id: tsig.c,v 1.6 1999/09/01 18:56:18 bwelling Exp $
* $Id: tsig.c,v 1.7 1999/09/02 02:10:43 explorer Exp $
* Principal Author: Brian Wellington
*/
......@@ -166,7 +166,7 @@ dns_tsig_sign(dns_message_t *msg) {
dns_rdata_any_tsig_t *tsig;
unsigned char data[128];
isc_buffer_t databuf, sigbuf, rdatabuf;
isc_dynbuffer_t *dynbuf;
isc_buffer_t *dynbuf;
dns_name_t *owner;
dns_rdata_t *rdata;
dns_rdatalist_t *datalist;
......@@ -356,7 +356,7 @@ dns_tsig_sign(dns_message_t *msg) {
tries = 0;
dynbuf = ISC_LIST_TAIL(msg->scratchpad);
INSIST(dynbuf != NULL);
rdatabuf = dynbuf->buffer;
rdatabuf = *dynbuf;
while (tries < 2) {
ret = dns_rdata_fromstruct(rdata, dns_rdataclass_any,
dns_rdatatype_tsig, tsig, &rdatabuf);
......@@ -365,12 +365,12 @@ dns_tsig_sign(dns_message_t *msg) {
else if (ret == ISC_R_NOSPACE) {
if (++tries == 2)
return (ISC_R_NOMEMORY);
ret = isc_dynbuffer_allocate(msg->mctx, &dynbuf, 512,
ISC_BUFFERTYPE_BINARY);
ret = isc_buffer_allocate(msg->mctx, &dynbuf, 512,
ISC_BUFFERTYPE_BINARY);
if (ret != ISC_R_SUCCESS)
goto cleanup_signature;
ISC_LIST_APPEND(msg->scratchpad, dynbuf, link);
rdatabuf = dynbuf->buffer;
rdatabuf = *dynbuf;
}
else
goto cleanup_signature;
......
lib/isc/buffer.c
View file @ 4556681e
......@@ -23,17 +23,14 @@
#include <isc/buffer.h>
#define BUFFER_MAGIC 0x42756621U /* Buf!. */
#define DYNBUFFER_MAGIC 0x64427566U /* dBuf. */
#define VALID_BUFFER(b) ((b) != NULL && \
(b)->magic == BUFFER_MAGIC)
#define VALID_DYNBUFFER(b) ((b) != NULL && \
(b)->magic == DYNBUFFER_MAGIC)
void
isc_buffer_init(isc_buffer_t *b, void *base, unsigned int length,
unsigned int type) {
unsigned int type)
{
/*
* Make 'b' refer to the 'length'-byte region starting at base.
*/
......@@ -47,6 +44,8 @@ isc_buffer_init(isc_buffer_t *b, void *base, unsigned int length,
b->used = 0;
b->current = 0;
b->active = 0;
b->mctx = NULL;
ISC_LINK_INIT(b, link);
}
void
......@@ -56,6 +55,8 @@ isc_buffer_invalidate(isc_buffer_t *b) {
*/
REQUIRE(VALID_BUFFER(b));
REQUIRE(!ISC_LINK_LINKED(b, link));
REQUIRE(b->mctx == NULL);
b->magic = 0;
b->type = 0;
......@@ -390,23 +391,21 @@ isc_buffer_putuint32(isc_buffer_t *b, isc_uint32_t val)
}
isc_result_t
isc_dynbuffer_allocate(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer,
unsigned int length, unsigned int type)
isc_buffer_allocate(isc_mem_t *mctx, isc_buffer_t **dynbuffer,
unsigned int length, unsigned int type)
{
isc_dynbuffer_t *dbuf;
isc_buffer_t *dbuf;
REQUIRE(dynbuffer != NULL);
REQUIRE(*dynbuffer == NULL);
dbuf = isc_mem_get(mctx, length + sizeof(isc_dynbuffer_t));
dbuf = isc_mem_get(mctx, length + sizeof(isc_buffer_t));
if (dbuf == NULL)
return (ISC_R_NOMEMORY);
dbuf->magic = DYNBUFFER_MAGIC;
ISC_LINK_INIT(dbuf, link);
isc_buffer_init(&dbuf->buffer,
((unsigned char *)dbuf) + sizeof(isc_dynbuffer_t),
isc_buffer_init(dbuf, ((unsigned char *)dbuf) + sizeof(isc_buffer_t),
length, type);
dbuf->mctx = mctx;
*dynbuffer = dbuf;
......@@ -414,28 +413,23 @@ isc_dynbuffer_allocate(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer,
}
void
isc_dynbuffer_reset(isc_dynbuffer_t *dynbuffer)
{
REQUIRE(VALID_DYNBUFFER(dynbuffer));
isc_buffer_clear(&dynbuffer->buffer);
}
void
isc_dynbuffer_free(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer)
isc_buffer_free(isc_buffer_t **dynbuffer)
{
unsigned int real_length;
isc_dynbuffer_t *dbuf;
isc_buffer_t *dbuf;
isc_mem_t *mctx;
REQUIRE(dynbuffer != NULL);
REQUIRE(VALID_DYNBUFFER(*dynbuffer));
REQUIRE(VALID_BUFFER(*dynbuffer));
REQUIRE((*dynbuffer)->mctx != NULL);
dbuf = *dynbuffer;
*dynbuffer = NULL; /* destroy external reference */
real_length = dbuf->buffer.length + sizeof(isc_dynbuffer_t);
isc_buffer_invalidate(&dbuf->buffer);
dbuf->magic = 0;
real_length = dbuf->length + sizeof(isc_buffer_t);
mctx = dbuf->mctx;
dbuf->mctx = NULL;
isc_buffer_invalidate(dbuf);
isc_mem_put(mctx, dbuf, real_length);
}
lib/isc/include/isc/buffer.h
View file @ 4556681e
......@@ -125,38 +125,31 @@ ISC_LANG_BEGINDECLS
* discouraged from directly manipulating the structure.
*/
typedef struct isc_buffer {
unsigned int magic;
unsigned int type;
void * base;
typedef struct isc_buffer isc_buffer_t;
struct isc_buffer {
unsigned int magic;
unsigned int type;
void *base;
/* The following integers are byte offsets from 'base'. */
unsigned int length;
unsigned int used;
unsigned int current;
unsigned int active;
} isc_buffer_t;
/*
* A handy thing to have, linkable buffers with built-in storage. These
* are allocated and freed with the isc_dynbuffer_alloc() and _free()
* functions below. These function should _ALWAYS_ be used to create these
* dynbuffers. The link is initialized on allocation and is solely for the
* caller to use.
*/
typedef struct isc_dynbuffer isc_dynbuffer_t;
struct isc_dynbuffer {
unsigned int magic;
isc_buffer_t buffer;
ISC_LINK(isc_dynbuffer_t) link;
}; /* variable sized */
unsigned int length;
unsigned int used;
unsigned int current;
unsigned int active;
/* linkable */
ISC_LINK(isc_buffer_t) link;
/* private internal elements */
isc_mem_t *mctx;
};
typedef ISC_LIST(isc_buffer_t) isc_bufferlist_t;
/***
*** Functions
***/
isc_result_t
isc_dynbuffer_allocate(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer,
unsigned int length, unsigned int type);
isc_buffer_allocate(isc_mem_t *mctx, isc_buffer_t **dynbuffer,
unsigned int length, unsigned int type);
/*
* Allocate a dynamic linkable buffer which has "length" bytes in the
* data region.
......@@ -169,17 +162,13 @@ isc_dynbuffer_allocate(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer,
* Returns:
* ISC_R_SUCCESS - success
* ISC_R_NOMEMORY - no memory available
*
* Note:
* Changing the buffer's length field is not permitted.
*/
void
isc_dynbuffer_reset(isc_dynbuffer_t *dynbuffer);
/*
* Reset the dynamic buffer to the initial state
*/
void
isc_dynbuffer_free(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer);
isc_buffer_free(isc_buffer_t **dynbuffer);
/*
* Release resources allocated for a dynamic buffer.
*
......@@ -188,11 +177,10 @@ isc_dynbuffer_free(isc_mem_t *mctx, isc_dynbuffer_t **dynbuffer);
*
* "*dynbuffer" is a valid dynamic buffer.
*
* "mctx" is valid.
*
* Ensures:
* "*dynbuffer" will be NULL on return, and all memory associated with
* the dynamic buffer is returned to memory context "mctx".
* the dynamic buffer is returned to the memory context used in
* isc_buffer_allocate().
*/
void
......
lib/isc/include/isc/socket.h
View file @ 4556681e
......@@ -61,16 +61,27 @@
#include <isc/lang.h>
#include <isc/boolean.h>
#include <isc/buffer.h>
#include <isc/result.h>
#include <isc/event.h>
#include <isc/eventclass.h>
#include <isc/task.h>
#include <isc/region.h>
#include <isc/mem.h>
#include <isc/net.h>
#include <isc/sockaddr.h>
ISC_LANG_BEGINDECLS
/***
*** Constants
***/
/*
* Maximum number of buffers in a scatter/gather read/write
*/
#define ISC_SOCKET_MAXSCATTERGATHER 8
/***
*** Types
***/
......@@ -84,7 +95,9 @@ struct isc_socketevent {
isc_result_t result; /* OK, EOF, whatever else */
unsigned int minimum; /* minimum i/o for event */
unsigned int n; /* bytes read or written */
isc_region_t region; /* the region info */
unsigned int offset; /* offset into buffer list */
isc_region_t region; /* for single-buffer i/o */
ISC_LIST(isc_buffer_t) bufferlist; /* list of buffers */
isc_sockaddr_t address; /* source address */
};
......
lib/isc/unix/socket.c
View file @ 4556681e
......@@ -28,13 +28,15 @@
#include <fcntl.h>
#include <isc/assertions.h>
#include <isc/buffer.h>
#include <isc/condition.h>
#include <isc/error.h>
#include <isc/thread.h>
#include <isc/list.h>
#include <isc/mutex.h>
#include <isc/net.h>
#include <isc/condition.h>
#include <isc/region.h>
#include <isc/socket.h>
#include <isc/list.h>
#include <isc/thread.h>
#include "util.h"
......@@ -186,6 +188,10 @@ static void internal_connect(isc_task_t *, isc_event_t *);
static void internal_recv(isc_task_t *, isc_event_t *);
static void internal_send(isc_task_t *, isc_event_t *);
static void process_cmsg(isc_socket_t *, struct msghdr *, isc_socketevent_t *);
static int build_msghdr_send(isc_socketevent_t *, struct msghdr *,
struct iovec *, unsigned int maxiov);
static int build_msghdr_recv(isc_socketevent_t *, struct msghdr *,
struct iovec *, unsigned int maxiov);
#define SELECT_POKE_SHUTDOWN (-1)
#define SELECT_POKE_NOTHING (-2)
......@@ -287,6 +293,47 @@ process_cmsg(isc_socket_t *sock, struct msghdr *msg, isc_socketevent_t *dev)
}
/*
* Construct an iov array and attach it to the msghdr passed in. Return
* 0 on success, non-zero on failure. This is the SEND constructor, which
* will used the used region of the buffer.
*
* Nothing can be NULL, and the done event must list at least one buffer
* on the buffer linked list for this function to be meaningful.
*/
static int
build_msghdr_send(isc_socketevent_t *dev, struct msghdr *msg,
struct iovec *iov, unsigned int maxiov)
{
unsigned int iovcount;
isc_buffer_t *buffer;
isc_region_t used;
iovcount = 0;
buffer = ISC_LIST_HEAD(dev->bufferlist);
for (;;) {
if (buffer == NULL)
break;
if (iovcount == maxiov)
return (-1);
isc_buffer_used(buffer, &used);
if (used.length > 0) {
iov[iovcount].iov_base = (void *)used.base;
iov[iovcount].iov_len = used.length;
iovcount++;
}
buffer = ISC_LIST_NEXT(buffer, link);
}
msg->msg_iov = iov;
msg->msg_iovlen = iovcount;
return (0);
}
/*
* Kill.
*
......@@ -870,7 +917,7 @@ internal_recv(isc_task_t *me, isc_event_t *ev)
int cc;
size_t read_count;
struct msghdr msghdr;
struct iovec iov;
struct iovec iov[ISC_SOCKET_MAXSCATTERGATHER];
(void)me;
......@@ -920,8 +967,8 @@ internal_recv(isc_task_t *me, isc_event_t *ev)
* we can.
*/
read_count = dev->region.length - dev->n;
iov.iov_base = (void *)(dev->region.base + dev->n);
iov.iov_len = read_count;
iov[0].iov_base = (void *)(dev->region.base + dev->n);
iov[0].iov_len = read_count;
memset(&msghdr, 0, sizeof (msghdr));
if (sock->type == isc_sockettype_udp) {
......@@ -933,7 +980,7 @@ internal_recv(isc_task_t *me, isc_event_t *ev)
msghdr.msg_namelen = 0;
dev->address = sock->address;
}
msghdr.msg_iov = &iov;
msghdr.msg_iov = iov;
msghdr.msg_iovlen = 1;
#ifdef ISC_NET_BSD44MSGHDR
......@@ -1068,7 +1115,7 @@ internal_send(isc_task_t *me, isc_event_t *ev)
int cc;
size_t write_count;
struct msghdr msghdr;
struct iovec iov;
struct iovec iov[ISC_SOCKET_MAXSCATTERGATHER];
(void)me;
......@@ -1121,8 +1168,8 @@ internal_send(isc_task_t *me, isc_event_t *ev)
* we can.
*/
write_count = dev->region.length - dev->n;
iov.iov_base = (void *)(dev->region.base + dev->n);
iov.iov_len = write_count;
iov[0].iov_base = (void *)(dev->region.base + dev->n);
iov[0].iov_len = write_count;
memset(&msghdr, 0, sizeof (msghdr));
if (sock->type == isc_sockettype_udp) {
......@@ -1130,7 +1177,7 @@ internal_send(isc_task_t *me, isc_event_t *ev)
msghdr.msg_namelen = dev->address.length;
}
msghdr.msg_iov = &iov;
msghdr.msg_iov = iov;
msghdr.msg_iovlen = 1;
#ifdef ISC_NET_BSD44MSGHDR
......@@ -1618,6 +1665,13 @@ isc_socketmgr_destroy(isc_socketmgr_t **managerp)