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NSMessagePort.m
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1973 lines (1773 loc) · 46.6 KB
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/** Implementation of network port object based on unix domain sockets
Copyright (C) 2000 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <richard@brainstorm.co.uk>
Based on code by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
*/
#import "common.h"
#define EXPOSE_NSPort_IVARS 1
#define EXPOSE_NSMessagePort_IVARS 1
#import "GNUstepBase/GSLock.h"
#import "Foundation/NSArray.h"
#import "Foundation/NSAutoreleasePool.h"
#import "Foundation/NSNotification.h"
#import "Foundation/NSException.h"
#import "Foundation/NSRunLoop.h"
#import "Foundation/NSByteOrder.h"
#import "Foundation/NSData.h"
#import "Foundation/NSDate.h"
#import "Foundation/NSMapTable.h"
#import "Foundation/NSPortMessage.h"
#import "Foundation/NSPortNameServer.h"
#import "Foundation/NSLock.h"
#import "Foundation/NSConnection.h"
#import "Foundation/NSPathUtilities.h"
#import "Foundation/NSValue.h"
#import "Foundation/NSFileManager.h"
#import "Foundation/NSProcessInfo.h"
#import "GSPrivate.h"
#import "GSNetwork.h"
#import "GSPortPrivate.h"
#include <stdio.h>
#include <sys/param.h> /* for MAXHOSTNAMELEN */
#include <sys/types.h>
#include <sys/un.h>
#include <arpa/inet.h> /* for inet_ntoa() */
#include <ctype.h> /* for strchr() */
#if defined(HAVE_SYS_FCNTL_H)
# include <sys/fcntl.h>
#elif defined(HAVE_FCNTL_H)
# include <fcntl.h>
#endif
#include <sys/time.h>
#include <sys/resource.h>
#include <netdb.h>
#include <sys/socket.h>
#if defined(HAVE_SYS_FILE_H)
# include <sys/file.h>
#endif
#include <sys/stat.h>
/*
* Stuff for setting the sockets into non-blocking mode.
*/
#if defined(__POSIX_SOURCE)\
|| defined(__EXT_POSIX1_198808)\
|| defined(O_NONBLOCK)
#define NBLK_OPT O_NONBLOCK
#else
#define NBLK_OPT FNDELAY
#endif
#include <netinet/in.h>
#include <net/if.h>
#if !defined(SIOCGIFCONF) || defined(__CYGWIN__)
#include <sys/ioctl.h>
#ifndef SIOCGIFCONF
#include <sys/sockio.h>
#endif
#endif
#if defined(__svr4__)
# if defined(HAVE_SYS_STROPTS)
# include <sys/stropts.h>
# endif
#endif
@interface NSProcessInfo (private)
+ (BOOL) _exists: (int)pid;
@end
/*
* Largest chunk of data possible in DO
*/
static uint32_t maxDataLength = 32 * 1024 * 1024;
#if 0
#define M_LOCK(X) {NSDebugMLLog(@"NSMessagePort",@"lock %@",X); [X lock];}
#define M_UNLOCK(X) {NSDebugMLLog(@"NSMessagePort",@"unlock %@",X); [X unlock];}
#else
#define M_LOCK(X) {[X lock];}
#define M_UNLOCK(X) {[X unlock];}
#endif
/*
* The GSPortItemType constant is used to identify the type of data in
* each packet read. All data transmitted is in a packet, each packet
* has an initial packet type and packet length.
*/
typedef enum {
GSP_NONE,
GSP_PORT, /* Simple port item. */
GSP_DATA, /* Simple data item. */
GSP_HEAD /* Port message header + initial data. */
} GSPortItemType;
/*
* The GSPortItemHeader structure defines the header for each item transmitted.
* Its contents are transmitted in network byte order.
*/
typedef struct {
uint32_t type; /* A GSPortItemType as a 4-byte number. */
uint32_t length; /* The length of the item (excluding header). */
} GSPortItemHeader;
/*
* The GSPortMsgHeader structure is at the start of any item of type GSP_HEAD.
* Its contents are transmitted in network byte order.
* Any additional data in the item is an NSData object.
* NB. additional data counts as part of the same item.
*/
typedef struct {
uint32_t mId; /* The ID for the message starting with this. */
uint32_t nItems; /* Number of items (including this one). */
} GSPortMsgHeader;
typedef struct {
unsigned char version;
unsigned char addr[0]; /* name of the port on the local host */
} GSPortInfo;
/*
* Utility functions for encoding and decoding ports.
*/
static NSMessagePort*
decodePort(NSData *data)
{
GSPortItemHeader *pih;
GSPortInfo *pi;
pih = (GSPortItemHeader*)[data bytes];
NSCAssert(GSSwapBigI32ToHost(pih->type) == GSP_PORT,
NSInternalInconsistencyException);
pi = (GSPortInfo*)&pih[1];
if (pi->version != 0)
{
NSLog(@"Remote version of GNUstep is more recent than this one (%i)",
pi->version);
return nil;
}
NSDebugFLLog(@"NSMessagePort", @"Decoded port as '%s'", pi->addr);
return [NSMessagePort _portWithName: pi->addr
listener: NO];
}
static NSData*
newDataWithEncodedPort(NSMessagePort *port)
{
GSPortItemHeader *pih;
GSPortInfo *pi;
NSMutableData *data;
unsigned plen;
const unsigned char *name = [port _name];
plen = 2 + strlen((char*)name);
data = [[NSMutableData alloc] initWithLength: sizeof(GSPortItemHeader)+plen];
pih = (GSPortItemHeader*)[data mutableBytes];
pih->type = GSSwapHostI32ToBig(GSP_PORT);
pih->length = GSSwapHostI32ToBig(plen);
pi = (GSPortInfo*)&pih[1];
strncpy((char*)pi->addr, (char*)name, strlen((char*)name) + 1);
NSDebugFLLog(@"NSMessagePort", @"Encoded port as '%s'", pi->addr);
return data;
}
/* Older systems (Solaris) compatibility */
#ifndef AF_LOCAL
#define AF_LOCAL AF_UNIX
#define PF_LOCAL PF_UNIX
#endif
#ifndef SUN_LEN
#define SUN_LEN(su) \
(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
#endif
#define GS_CONNECTION_MSG 0
#define NETBLOCK 8192
/*
* Theory of operation
*
*
*/
/* Private interfaces */
/*
* Here is how data is transmitted over a socket -
* Initially the process making the connection sends an item of type
* GSP_PORT to tell the remote end what port is connecting to it.
* Therafter, all communication is via port messages. Each port message
* consists of an item of type GSP_HEAD followed by zero or more items
* of type GSP_PORT or GSP_DATA. The number of items in a port message
* is encoded in the 'nItems' field of the header.
*/
typedef enum {
GS_H_UNCON = 0, // Currently idle and unconnected.
GS_H_TRYCON, // Trying connection (outgoing).
GS_H_ACCEPT, // Making initial connection (incoming).
GS_H_CONNECTED // Currently connected.
} GSHandleState;
@interface GSMessageHandle : NSObject <RunLoopEvents>
{
int desc; /* File descriptor for I/O. */
unsigned wItem; /* Index of item being written. */
NSMutableData *wData; /* Data object being written. */
unsigned wLength; /* Ammount written so far. */
NSMutableArray *wMsgs; /* Message in progress. */
NSMutableData *rData; /* Buffer for incoming data */
uint32_t rLength; /* Amount read so far. */
uint32_t rWant; /* Amount desired. */
NSMutableArray *rItems; /* Message in progress. */
GSPortItemType rType; /* Type of data being read. */
uint32_t rId; /* Id of incoming message. */
unsigned nItems; /* Number of items to be read. */
GSHandleState state; /* State of the handle. */
unsigned int addrNum; /* Address number within host. */
@public
NSRecursiveLock *myLock; /* Lock for this handle. */
BOOL caller; /* Did we connect to other end? */
BOOL valid;
NSMessagePort *recvPort;
NSMessagePort *sendPort;
struct sockaddr_un sockAddr; /* Far end of connection. */
}
+ (GSMessageHandle*) handleWithDescriptor: (int)d;
- (BOOL) connectToPort: (NSMessagePort*)aPort beforeDate: (NSDate*)when;
- (int) descriptor;
- (void) invalidate;
- (BOOL) isValid;
- (void) receivedEvent: (void*)data
type: (RunLoopEventType)type
extra: (void*)extra
forMode: (NSString*)mode;
- (NSMessagePort*) recvPort;
- (BOOL) sendMessage: (NSArray*)components beforeDate: (NSDate*)when;
- (NSMessagePort*) sendPort;
- (void) setState: (GSHandleState)s;
- (GSHandleState) state;
@end
@implementation GSMessageHandle
static Class mutableArrayClass;
static Class mutableDataClass;
static Class portMessageClass;
static Class runLoopClass;
+ (id) allocWithZone: (NSZone*)zone
{
[NSException raise: NSGenericException
format: @"attempt to alloc a GSMessageHandle!"];
return nil;
}
+ (GSMessageHandle*) handleWithDescriptor: (int)d
{
GSMessageHandle *handle;
int e;
if (d < 0)
{
NSLog(@"illegal descriptor (%d) for message handle", d);
return nil;
}
if ((e = fcntl(d, F_GETFL, 0)) >= 0)
{
e |= NBLK_OPT;
if (fcntl(d, F_SETFL, e) < 0)
{
NSLog(@"unable to set non-blocking mode on %d - %@",
d, [NSError _last]);
return nil;
}
}
else
{
NSLog(@"unable to get non-blocking mode on %d - %@",
d, [NSError _last]);
return nil;
}
handle = (GSMessageHandle*)NSAllocateObject(self, 0, NSDefaultMallocZone());
handle->desc = d;
handle->wMsgs = [NSMutableArray new];
handle->myLock = [NSRecursiveLock new];
handle->valid = YES;
return AUTORELEASE(handle);
}
+ (void) initialize
{
if (self == [GSMessageHandle class])
{
mutableArrayClass = [NSMutableArray class];
mutableDataClass = [NSMutableData class];
portMessageClass = [NSPortMessage class];
runLoopClass = [NSRunLoop class];
}
}
- (void) _add: (NSRunLoop*)l
{
[l addEvent: (void*)(uintptr_t)desc
type: ET_WDESC
watcher: self
forMode: NSConnectionReplyMode];
[l addEvent: (void*)(uintptr_t)desc
type: ET_WDESC
watcher: self
forMode: NSDefaultRunLoopMode];
}
- (void) _rem: (NSRunLoop*)l
{
[l removeEvent: (void*)(uintptr_t)desc
type: ET_WDESC
forMode: NSConnectionReplyMode
all: NO];
[l removeEvent: (void*)(uintptr_t)desc
type: ET_WDESC
forMode: NSDefaultRunLoopMode
all: NO];
}
- (BOOL) connectToPort: (NSMessagePort*)aPort beforeDate: (NSDate*)when
{
NSRunLoop *l;
const unsigned char *name;
M_LOCK(myLock);
NSDebugMLLog(@"NSMessagePort",
@"Connecting on 0x%"PRIxPTR" before %@", (NSUInteger)self, when);
if (state != GS_H_UNCON)
{
BOOL result;
if (state == GS_H_CONNECTED) /* Already connected. */
{
NSLog(@"attempting connect on connected handle");
result = YES;
}
else if (state == GS_H_ACCEPT) /* Impossible. */
{
NSLog(@"attempting connect with accepting handle");
result = NO;
}
else /* Already connecting. */
{
NSLog(@"attempting connect while connecting");
result = NO;
}
M_UNLOCK(myLock);
return result;
}
if (recvPort == nil || aPort == nil)
{
NSLog(@"attempting connect with port(s) unset");
M_UNLOCK(myLock);
return NO; /* impossible. */
}
name = [aPort _name];
memset(&sockAddr, '\0', sizeof(sockAddr));
sockAddr.sun_family = AF_LOCAL;
strncpy(sockAddr.sun_path, (char*)name, sizeof(sockAddr.sun_path) - 1);
if (connect(desc, (struct sockaddr*)&sockAddr, SUN_LEN(&sockAddr)) < 0)
{
if (!GSWOULDBLOCK)
{
NSLog(@"unable to make connection to %s - %@",
sockAddr.sun_path, [NSError _last]);
M_UNLOCK(myLock);
return NO;
}
}
state = GS_H_TRYCON;
l = [NSRunLoop currentRunLoop];
[self _add: l];
while (valid == YES && state == GS_H_TRYCON
&& [when timeIntervalSinceNow] > 0)
{
[l runMode: NSConnectionReplyMode beforeDate: when];
}
[self _rem: l];
if (state == GS_H_TRYCON)
{
state = GS_H_UNCON;
addrNum = 0;
M_UNLOCK(myLock);
return NO; /* Timed out */
}
else if (state == GS_H_UNCON)
{
addrNum = 0;
state = GS_H_UNCON;
M_UNLOCK(myLock);
return NO;
}
else
{
int status = 1;
if (setsockopt(desc, SOL_SOCKET, SO_KEEPALIVE, (char*)&status,
sizeof(status)) < 0)
{
NSLog(@"failed to turn on keepalive for connected socket %d", desc);
}
addrNum = 0;
caller = YES;
[aPort addHandle: self forSend: YES];
M_UNLOCK(myLock);
return YES;
}
}
- (void) dealloc
{
[self finalize];
DESTROY(rData);
DESTROY(rItems);
DESTROY(wMsgs);
DESTROY(myLock);
[super dealloc];
}
- (NSString*) description
{
return [NSString stringWithFormat: @"<GSMessageHandle %p (%d) to %s>",
self, desc, sockAddr.sun_path];
}
- (int) descriptor
{
return desc;
}
- (void) finalize
{
[self invalidate];
(void)close(desc);
desc = -1;
}
- (void) invalidate
{
if (valid == YES)
{
M_LOCK(myLock);
if (valid == YES)
{
NSRunLoop *l;
valid = NO;
l = [runLoopClass currentRunLoop];
[l removeEvent: (void*)(uintptr_t)desc
type: ET_RDESC
forMode: nil
all: YES];
[l removeEvent: (void*)(uintptr_t)desc
type: ET_WDESC
forMode: nil
all: YES];
NSDebugMLLog(@"NSMessagePort",
@"invalidated 0x%"PRIxPTR, (NSUInteger)self);
[[self recvPort] removeHandle: self];
[[self sendPort] removeHandle: self];
}
M_UNLOCK(myLock);
}
}
- (BOOL) isValid
{
return valid;
}
- (NSMessagePort*) recvPort
{
if (recvPort == nil)
return nil;
else
return recvPort;
}
- (void) receivedEvent: (void*)data
type: (RunLoopEventType)type
extra: (void*)extra
forMode: (NSString*)mode
{
NSDebugMLLog(@"NSMessagePort_details",
@"received %s event on 0x%"PRIxPTR,
type != ET_WDESC ? "read" : "write", (NSUInteger)self);
/*
* If we have been invalidated (desc < 0) then we should ignore this
* event and remove ourself from the runloop.
*/
if (desc < 0)
{
NSRunLoop *l = [runLoopClass currentRunLoop];
[l removeEvent: data
type: ET_WDESC
forMode: mode
all: YES];
return;
}
M_LOCK(myLock);
if (type != ET_WDESC)
{
unsigned want;
void *bytes;
int res;
/*
* Make sure we have a buffer big enough to hold all the data we are
* expecting, or NETBLOCK bytes, whichever is greater.
*/
if (rData == nil)
{
rData = [[mutableDataClass alloc] initWithLength: NETBLOCK];
rWant = sizeof(GSPortItemHeader);
rLength = 0;
want = NETBLOCK;
}
else
{
want = [rData length];
if (want < rWant)
{
want = rWant;
[rData setLength: want];
}
if (want < NETBLOCK)
{
want = NETBLOCK;
[rData setLength: want];
}
}
/*
* Now try to fill the buffer with data.
*/
bytes = [rData mutableBytes];
res = read(desc, bytes + rLength, want - rLength);
if (res <= 0)
{
if (res == 0)
{
NSDebugMLLog(@"NSMessagePort",
@"read eof on 0x%"PRIxPTR, (NSUInteger)self);
M_UNLOCK(myLock);
[self invalidate];
return;
}
else if (errno != EINTR && errno != EAGAIN)
{
NSDebugMLLog(@"NSMessagePort",
@"read failed - %@ on 0x%p", [NSError _last], self);
M_UNLOCK(myLock);
[self invalidate];
return;
}
res = 0; /* Interrupted - continue */
}
NSDebugMLLog(@"NSMessagePort_details",
@"read %d bytes on 0x%"PRIxPTR, res, (NSUInteger)self);
rLength += res;
while (valid == YES && rLength >= rWant)
{
BOOL shouldDispatch = NO;
switch (rType)
{
case GSP_NONE:
{
GSPortItemHeader *h;
unsigned l;
/*
* We have read an item header - set up to read the
* remainder of the item.
*/
h = (GSPortItemHeader*)bytes;
rType = GSSwapBigI32ToHost(h->type);
l = GSSwapBigI32ToHost(h->length);
if (rType == GSP_PORT)
{
if (l > 512)
{
NSLog(@"%@ - unreasonable length (%u) for port",
self, l);
M_UNLOCK(myLock);
[self invalidate];
return;
}
/*
* For a port, we leave the item header in the data
* so that our decode function can check length info.
*/
rWant += l;
}
else if (rType == GSP_DATA)
{
if (l == 0)
{
NSData *d;
/*
* For a zero-length data chunk, we create an empty
* data object and add it to the current message.
*/
rType = GSP_NONE; /* ready for a new item */
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = sizeof(GSPortItemHeader);
d = [mutableDataClass new];
[rItems addObject: d];
RELEASE(d);
if (nItems == [rItems count])
{
shouldDispatch = YES;
}
}
else
{
if (l > maxDataLength)
{
NSLog(@"%@ - unreasonable length (%u) for data",
self, l);
M_UNLOCK(myLock);
[self invalidate];
return;
}
/*
* If not a port or zero length data,
* we discard the data read so far and fill the
* data object with the data item from the msg.
*/
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = l;
}
}
else if (rType == GSP_HEAD)
{
if (l > maxDataLength)
{
NSLog(@"%@ - unreasonable length (%u) for data",
self, l);
M_UNLOCK(myLock);
[self invalidate];
return;
}
/*
* If not a port or zero length data,
* we discard the data read so far and fill the
* data object with the data item from the msg.
*/
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = l;
}
else
{
NSLog(@"%@ - bad data received on port handle, rType=%i",
self, rType);
M_UNLOCK(myLock);
[self invalidate];
return;
}
}
break;
case GSP_HEAD:
{
GSPortMsgHeader *h;
rType = GSP_NONE; /* ready for a new item */
/*
* We have read a message header - set up to read the
* remainder of the message.
*/
h = (GSPortMsgHeader*)bytes;
rId = GSSwapBigI32ToHost(h->mId);
nItems = GSSwapBigI32ToHost(h->nItems);
NSAssert(nItems >0, NSInternalInconsistencyException);
rItems
= [mutableArrayClass allocWithZone: NSDefaultMallocZone()];
rItems = [rItems initWithCapacity: nItems];
if (rWant > sizeof(GSPortMsgHeader))
{
NSData *d;
/*
* The first data item of the message was included in
* the header - so add it to the rItems array.
*/
rWant -= sizeof(GSPortMsgHeader);
d = [mutableDataClass alloc];
d = [d initWithBytes: bytes + sizeof(GSPortMsgHeader)
length: rWant];
[rItems addObject: d];
RELEASE(d);
rWant += sizeof(GSPortMsgHeader);
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = sizeof(GSPortItemHeader);
if (nItems == 1)
{
shouldDispatch = YES;
}
}
else
{
/*
* want to read another item
*/
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = sizeof(GSPortItemHeader);
}
}
break;
case GSP_DATA:
{
NSData *d;
rType = GSP_NONE; /* ready for a new item */
d = [mutableDataClass allocWithZone: NSDefaultMallocZone()];
d = [d initWithBytes: bytes length: rWant];
[rItems addObject: d];
RELEASE(d);
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = sizeof(GSPortItemHeader);
if (nItems == [rItems count])
{
shouldDispatch = YES;
}
}
break;
case GSP_PORT:
{
NSMessagePort *p;
rType = GSP_NONE; /* ready for a new item */
p = decodePort(rData);
if (p == nil)
{
NSLog(@"%@ - unable to decode remote port", self);
M_UNLOCK(myLock);
[self invalidate];
return;
}
/*
* Set up to read another item header.
*/
rLength -= rWant;
if (rLength > 0)
{
memmove(bytes, bytes + rWant, rLength);
}
rWant = sizeof(GSPortItemHeader);
if (state == GS_H_ACCEPT)
{
/*
* This is the initial port information on a new
* connection - set up port relationships.
*/
state = GS_H_CONNECTED;
[p addHandle: self forSend: YES];
}
else
{
/*
* This is a port within a port message - add
* it to the message components.
*/
[rItems addObject: p];
if (nItems == [rItems count])
{
shouldDispatch = YES;
}
}
}
break;
}
if (shouldDispatch == YES)
{
NSPortMessage *pm;
NSMessagePort *rp = [self recvPort];
pm = [portMessageClass allocWithZone: NSDefaultMallocZone()];
pm = [pm initWithSendPort: [self sendPort]
receivePort: rp
components: rItems];
[pm setMsgid: rId];
rId = 0;
DESTROY(rItems);
NSDebugMLLog(@"NSMessagePort_details",
@"got message %@ on 0x%"PRIxPTR, pm, (NSUInteger)self);
IF_NO_GC([rp retain];)
M_UNLOCK(myLock);
NS_DURING
{
[rp handlePortMessage: pm];
}
NS_HANDLER
{
M_LOCK(myLock);
RELEASE(pm);
RELEASE(rp);
[localException raise];
}
NS_ENDHANDLER
M_LOCK(myLock);
RELEASE(pm);
RELEASE(rp);
bytes = [rData mutableBytes];
}
}
}
else
{
if (state == GS_H_TRYCON) /* Connection attempt. */
{
int res = 0;
unsigned len = sizeof(res);
/* Currently gnu hurd doesn't support getsockopt on local domain sockets
* and fails with a 'protocol not supported' error.
* We therefore just hope the connect was a success.
*/
#if !defined(__gnu_hurd__)
if (getsockopt(desc, SOL_SOCKET, SO_ERROR, (char*)&res, &len) != 0)
{
state = GS_H_UNCON;
NSLog(@"connect attempt failed - %@", [NSError _last]);
}
else if (res != 0)
{
state = GS_H_UNCON;
NSLog(@"connect attempt failed - %@",
[NSError _systemError: res]);
}
else
#endif
{
NSData *d = newDataWithEncodedPort([self recvPort]);
len = write(desc, [d bytes], [d length]);
if (len == (int)[d length])
{
NSDebugMLLog(@"NSMessagePort_details",
@"wrote %d bytes on 0x%"PRIxPTR, len, (NSUInteger)self);
state = GS_H_CONNECTED;
}
else
{
state = GS_H_UNCON;
NSLog(@"connect write attempt failed - %@",
[NSError _last]);
}
RELEASE(d);
}
}
else
{
int res;
unsigned l;
const void *b;
if (wData == nil)
{
if ([wMsgs count] > 0)
{
NSArray *components = [wMsgs objectAtIndex: 0];
wData = [components objectAtIndex: wItem++];
wLength = 0;
}
else
{
// NSLog(@"No messages to write on 0x%"PRIxPTR".", (NSUInteger)self);
M_UNLOCK(myLock);
return;
}
}
b = [wData bytes];
l = [wData length];
res = write(desc, b + wLength, l - wLength);
if (res < 0)
{
if (errno != EINTR && errno != EAGAIN)
{
NSLog(@"write attempt failed - %@", [NSError _last]);
M_UNLOCK(myLock);
[self invalidate];
return;
}
}
else
{
NSDebugMLLog(@"NSMessagePort_details",
@"wrote %d bytes on 0x%"PRIxPTR, res, (NSUInteger)self);
wLength += res;
if (wLength == l)
{
NSArray *components;
/*
* We have completed a data item so see what is
* left of the message components.
*/
components = [wMsgs objectAtIndex: 0];
wLength = 0;
if ([components count] > wItem)
{
/*
* More to write - get next item.
*/
wData = [components objectAtIndex: wItem++];