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checkpoint new development: recvmsg() path is now common between all receiving

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routines (internal and external)
This commit is contained in:
Michael Graff
1999-09-03 00:22:28 +00:00
parent 3235976f18
commit ad76b9d585
1 changed files with 149 additions and 211 deletions
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360
lib/isc/unix/socket.c
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@@ -175,8 +175,8 @@ struct isc_socketmgr {
#define MANAGED 1
#define CLOSE_PENDING 2
static void send_recvdone_event(isc_socket_t *, isc_task_t **,
isc_socketevent_t **, isc_result_t, int);
static void send_recvdone_event(isc_socket_t *, isc_socketevent_t **,
isc_result_t);
static void send_senddone_event(isc_socket_t *, isc_task_t **,
isc_socketevent_t **, isc_result_t, int);
static void free_socket(isc_socket_t **);
@@ -530,6 +530,102 @@ allocate_socketevent(isc_socket_t *sock, isc_eventtype_t eventtype,
return (ev);
}
#define DOIO_SUCCESS 0
#define DOIO_SOFT 1
#define DOIO_HARD 2
#define DOIO_EOF 3
#define DOIO_UNEXPECTED (-1)
static int
doio_recv(isc_socket_t *sock, isc_socketevent_t *dev)
{
int cc;
struct iovec iov[ISC_SOCKET_MAXSCATTERGATHER];
size_t read_count;
struct msghdr msghdr;
if (build_msghdr_recv(sock, dev, &msghdr, iov,
ISC_SOCKET_MAXSCATTERGATHER, &read_count)
!= 0)
return (DOIO_UNEXPECTED); /* XXX Need better errors! */
cc = recvmsg(sock->fd, &msghdr, 0);
if (sock->type == isc_sockettype_udp)
dev->address.length = msghdr.msg_namelen;
XTRACE(TRACE_RECV,
("do_recv: recvmsg(%d) %d bytes, err %d/%s, from %s\n",
sock->fd, cc, errno, strerror(errno),
inet_ntoa(dev->address.type.sin.sin_addr)));
if (cc < 0) {
if (SOFT_ERROR(errno))
return (DOIO_SOFT);
#define SOFT_OR_HARD(_system, _isc) \
if (errno == _system) { \
if (sock->connected) { \
if (sock->type == isc_sockettype_tcp) \
sock->recv_result = _isc; \
send_recvdone_event(sock, &dev, _isc); \
} \
select_poke(sock->manager, sock->fd); \
return (DOIO_HARD); \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
SOFT_OR_HARD(ENETUNREACH, ISC_R_NETUNREACH);
SOFT_OR_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
#undef SOFT_OR_HARD
/*
* This might not be a permanent error.
*/
if (errno == ENOBUFS) {
send_recvdone_event(sock, &dev, ISC_R_UNEXPECTED);
return (DOIO_SOFT);
}
sock->recv_result = ISC_R_UNEXPECTED;
send_recvdone_event(sock, &dev, ISC_R_UNEXPECTED);
return (DOIO_SUCCESS);
}
/*
* On TCP, zero length reads indicate EOF, while on
* UDP, zero length reads are perfectly valid, although
* strange.
*/
if ((sock->type == isc_sockettype_tcp) && (cc == 0)) {
sock->recv_result = ISC_R_EOF;
return (DOIO_EOF);
}
/*
* If there are control messages attached, run through them and pull
* out the interesting bits.
*
* Note that for multi-read TCP this isn't as interesting in that
* only the last packet will set some of these, but that is better
* than nothing.
*/
process_cmsg(sock, &msghdr, dev);
/*
* If we read less than we expected, update counters,
* and let the upper layer poke the descriptor.
*/
dev->n += cc;
if (((size_t)cc != read_count) && (dev->n < dev->minimum))
return (DOIO_SOFT);
/*
* full reads are posted, or partials if partials are ok.
*/
send_recvdone_event(sock, &dev, ISC_R_SUCCESS);
return (DOIO_SUCCESS);
}
/*
* Kill.
*
@@ -925,18 +1021,24 @@ dispatch_connect(isc_socket_t *sock)
* Caller must have the socket locked.
*/
static void
send_recvdone_event(isc_socket_t *sock, isc_task_t **taskp,
isc_socketevent_t **dev, isc_result_t resultcode,
int detach)
send_recvdone_event(isc_socket_t *sock, isc_socketevent_t **dev,
isc_result_t resultcode)
{
isc_task_t *task;
task = (*dev)->sender;
(*dev)->result = resultcode;
(*dev)->sender = sock;
if (ISC_LINK_LINKED(*dev, link))
ISC_LIST_DEQUEUE(sock->recv_list, *dev, link);
if (detach)
ISC_TASK_SENDANDDETACH(taskp, (isc_event_t **)dev);
if (((*dev)->attributes & ISC_SOCKEVENTATTR_ATTACHED)
== ISC_SOCKEVENTATTR_ATTACHED)
ISC_TASK_SENDANDDETACH(&task, (isc_event_t **)dev);
else
ISC_TASK_SEND(*taskp, (isc_event_t **)dev);
ISC_TASK_SEND(task, (isc_event_t **)dev);
}
/*
@@ -1110,10 +1212,6 @@ internal_recv(isc_task_t *me, isc_event_t *ev)
isc_socketevent_t *dev;
isc_socket_t *sock;
isc_task_t *task;
int cc;
size_t read_count;
struct msghdr msghdr;
struct iovec iov[ISC_SOCKET_MAXSCATTERGATHER];
(void)me;
@@ -1153,119 +1251,34 @@ internal_recv(isc_task_t *me, isc_event_t *ev)
* continue the loop.
*/
if (dev->type == ISC_SOCKEVENT_RECVMARK) {
send_recvdone_event(sock, &task, &dev,
sock->recv_result, 1);
send_recvdone_event(sock, &dev, sock->recv_result);
goto next;
}
/*
* It must be a read request. Try to satisfy it as best
* we can.
*/
build_msghdr_recv(sock, dev, &msghdr, iov,
ISC_SOCKET_MAXSCATTERGATHER, &read_count);
cc = recvmsg(sock->fd, &msghdr, 0);
if (sock->type == isc_sockettype_udp)
dev->address.length = msghdr.msg_namelen;
XTRACE(TRACE_RECV,
("internal_recv: recvmsg(%d) %d bytes, err %d/%s, from %s\n",
sock->fd, cc, errno, strerror(errno),
inet_ntoa(dev->address.type.sin.sin_addr)));
/*
* check for error or block condition
*/
if (cc < 0) {
if (SOFT_ERROR(errno))
goto poke;
#define SOFT_OR_HARD(_system, _isc) \
if (errno == _system) { \
if (sock->connected) { \
if (sock->type == isc_sockettype_tcp) \
sock->recv_result = _isc; \
send_recvdone_event(sock, &task, &dev, _isc, 1); \
} \
goto next; \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
SOFT_OR_HARD(ENETUNREACH, ISC_R_NETUNREACH);
SOFT_OR_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
#undef SOFT_OR_HARD
switch (doio_recv(sock, dev)) {
case DOIO_SOFT:
case DOIO_HARD:
goto poke;
break;
case DOIO_EOF:
/*
* This might not be a permanent error.
* read of 0 means the remote end was closed.
* Run through the event queue and dispatch all
* the events with an EOF result code. This will
* set the EOF flag in markers as well, but
* that's really ok.
*/
if (errno == ENOBUFS) {
send_recvdone_event(sock, &task, &dev,
ISC_R_NORESOURCES, 1);
goto next;
}
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal read: %s", strerror(errno));
sock->recv_result = ISC_R_UNEXPECTED;
send_recvdone_event(sock, &task, &dev,
ISC_R_UNEXPECTED, 1);
goto next;
}
/*
* read of 0 means the remote end was closed. Run through
* the event queue and dispatch all the events with an EOF
* result code. This will set the EOF flag in markers as
* well, but that's really ok.
*/
if ((sock->type == isc_sockettype_tcp) && (cc == 0)) {
sock->recv_result = ISC_R_EOF;
do {
send_recvdone_event(sock, &task, &dev,
ISC_R_EOF, 1);
send_recvdone_event(sock, &dev, ISC_R_EOF);
dev = ISC_LIST_HEAD(sock->recv_list);
} while (dev != NULL);
goto poke;
}
break;
/*
* if we read less than we expected, update counters,
* poke.
*/
if ((size_t)cc < read_count) {
dev->n += cc;
process_cmsg(sock, &msghdr, dev);
/*
* If partial reads are allowed, we return whatever
* was read with a success result, and continue
* the loop.
*/
if (dev->minimum <= dev->n) {
send_recvdone_event(sock, &task, &dev,
ISC_R_SUCCESS, 1);
goto next;
}
/*
* Partials not ok. Exit the loop and notify the
* watcher to wait for more reads
*/
goto poke;
}
/*
* Exactly what we wanted to read. We're done with this
* entry. Post its completion event.
*/
if ((size_t)cc == read_count) {
dev->n += read_count;
send_recvdone_event(sock, &task, &dev,
ISC_R_SUCCESS, 1);
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
break;
}
next:
@@ -1833,11 +1846,7 @@ isc_socket_recv(isc_socket_t *sock, isc_region_t *region, unsigned int minimum,
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
int cc;
isc_boolean_t was_empty;
struct msghdr msghdr;
struct iovec iov[ISC_SOCKET_MAXSCATTERGATHER];
size_t read_count;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(region != NULL);
@@ -1855,8 +1864,6 @@ isc_socket_recv(isc_socket_t *sock, isc_region_t *region, unsigned int minimum,
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
ISC_LINK_INIT(dev, link);
ISC_LIST_INIT(dev->bufferlist);
/*
* UDP sockets are always partial read
@@ -1873,6 +1880,7 @@ isc_socket_recv(isc_socket_t *sock, isc_region_t *region, unsigned int minimum,
dev->result = ISC_R_SUCCESS;
dev->n = 0;
dev->region = *region;
dev->sender = task;
was_empty = ISC_LIST_EMPTY(sock->recv_list);
@@ -1882,93 +1890,27 @@ isc_socket_recv(isc_socket_t *sock, isc_region_t *region, unsigned int minimum,
if (!was_empty)
goto queue;
build_msghdr_recv(sock, dev, &msghdr, iov,
ISC_SOCKET_MAXSCATTERGATHER, &read_count);
cc = recvmsg(sock->fd, &msghdr, 0);
if (sock->type == isc_sockettype_udp)
dev->address.length = msghdr.msg_namelen;
XTRACE(TRACE_RECV,
("isc_socket_recv: recvmsg(%d) %d bytes, err %d/%s, from %s\n",
sock->fd, cc, errno, strerror(errno),
inet_ntoa(dev->address.type.sin.sin_addr)));
if (cc < 0) {
if (SOFT_ERROR(errno))
goto queue;
#define SOFT_OR_HARD(_system, _isc) \
if (errno == _system) { \
if (sock->connected) { \
if (sock->type == isc_sockettype_tcp) \
sock->recv_result = _isc; \
send_recvdone_event(sock, &task, &dev, _isc, 0); \
} \
select_poke(sock->manager, sock->fd); \
goto out; \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
SOFT_OR_HARD(ENETUNREACH, ISC_R_NETUNREACH);
SOFT_OR_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
#undef SOFT_OR_HARD
/*
* This might not be a permanent error.
*/
if (errno == ENOBUFS) {
send_recvdone_event(sock, &task, &dev,
ISC_R_UNEXPECTED, 0);
goto queue;
}
sock->recv_result = ISC_R_UNEXPECTED;
send_recvdone_event(sock, &task, &dev, ISC_R_UNEXPECTED, 0);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* On TCP, zero length reads indicate EOF, while on
* UDP, zero length reads are perfectly valid, although
* strange.
*/
if ((sock->type == isc_sockettype_tcp) && (cc == 0)) {
sock->recv_result = ISC_R_EOF;
send_recvdone_event(sock, &task, &dev, ISC_R_EOF, 0);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
dev->n = cc;
/*
* If there are control messages attached, run through them and pull
* out the interesting bits.
*
* Note that for multi-read TCP this isn't as interesting in that
* only the last packet will set some of these, but that is better
* than nothing.
*/
process_cmsg(sock, &msghdr, dev);
/*
* Partial reads need to be queued
*/
if (((size_t)cc != read_count) && (dev->n < dev->minimum))
switch (doio_recv(sock, dev)) {
case DOIO_SOFT:
goto queue;
break;
/*
* full reads are posted, or partials if partials are ok.
*/
send_recvdone_event(sock, &task, &dev, ISC_R_SUCCESS, 0);
case DOIO_HARD:
goto out;
break;
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
case DOIO_EOF:
send_recvdone_event(sock, &dev, ISC_R_EOF);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
break;
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
break;
}
queue:
/*
@@ -1979,6 +1921,7 @@ isc_socket_recv(isc_socket_t *sock, isc_region_t *region, unsigned int minimum,
*/
isc_task_attach(task, &ntask);
dev->sender = ntask;
dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
/*
* Enqueue the request. If the socket was previously not being
@@ -2052,11 +1995,6 @@ isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
build_msghdr_send(sock, dev, &msghdr, iov,
ISC_SOCKET_MAXSCATTERGATHER, &write_count);
printf("%d: iov[0].iov_len = %d, iov_base = %p\n"
"%d: msghdr.msg_iovlen = %d, write_count = %d\n",
sock->fd, iov[0].iov_len, iov[0].iov_base,
sock->fd, msghdr.msg_iovlen, write_count);
cc = sendmsg(sock->fd, &msghdr, 0);
if (cc < 0) {
@@ -2586,8 +2524,8 @@ isc_socket_cancel(isc_socket_t *sock, isc_task_t *task, unsigned int how)
next = ISC_LIST_NEXT(dev, link);
if ((task == NULL) || (task == current_task))
send_recvdone_event(sock, &current_task, &dev,
ISC_R_CANCELED, 1);
send_recvdone_event(sock, &dev,
ISC_R_CANCELED);
dev = next;
}
}