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sysdeps_win32.c
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sysdeps_win32.c
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#include "sysdeps.h"
#include <windows.h>
#include <winsock2.h>
#include <stdio.h>
#include <errno.h>
#define TRACE_TAG TRACE_SYSDEPS
#include "adb.h"
extern void fatal(const char *fmt, ...);
#define assert(cond) do { if (!(cond)) fatal( "assertion failed '%s' on %s:%ld\n", #cond, __FILE__, __LINE__ ); } while (0)
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** replaces libs/cutils/load_file.c *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
void *load_file(const char *fn, unsigned *_sz)
{
HANDLE file;
char *data;
DWORD file_size;
file = CreateFile( fn,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL );
if (file == INVALID_HANDLE_VALUE)
return NULL;
file_size = GetFileSize( file, NULL );
data = NULL;
if (file_size > 0) {
data = (char*) malloc( file_size + 1 );
if (data == NULL) {
D("load_file: could not allocate %ld bytes\n", file_size );
file_size = 0;
} else {
DWORD out_bytes;
if ( !ReadFile( file, data, file_size, &out_bytes, NULL ) ||
out_bytes != file_size )
{
D("load_file: could not read %ld bytes from '%s'\n", file_size, fn);
free(data);
data = NULL;
file_size = 0;
}
}
}
CloseHandle( file );
*_sz = (unsigned) file_size;
return data;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** common file descriptor handling *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
typedef const struct FHClassRec_* FHClass;
typedef struct FHRec_* FH;
typedef struct EventHookRec_* EventHook;
typedef struct FHClassRec_
{
void (*_fh_init) ( FH f );
int (*_fh_close)( FH f );
int (*_fh_lseek)( FH f, int pos, int origin );
int (*_fh_read) ( FH f, void* buf, int len );
int (*_fh_write)( FH f, const void* buf, int len );
void (*_fh_hook) ( FH f, int events, EventHook hook );
} FHClassRec;
/* used to emulate unix-domain socket pairs */
typedef struct SocketPairRec_* SocketPair;
typedef struct FHRec_
{
FHClass clazz;
int used;
int eof;
union {
HANDLE handle;
SOCKET socket;
SocketPair pair;
} u;
HANDLE event;
int mask;
char name[32];
} FHRec;
#define fh_handle u.handle
#define fh_socket u.socket
#define fh_pair u.pair
#define WIN32_FH_BASE 100
#define WIN32_MAX_FHS 128
static adb_mutex_t _win32_lock;
static FHRec _win32_fhs[ WIN32_MAX_FHS ];
static int _win32_fh_count;
static FH
_fh_from_int( int fd )
{
FH f;
fd -= WIN32_FH_BASE;
if (fd < 0 || fd >= _win32_fh_count) {
D( "_fh_from_int: invalid fd %d\n", fd + WIN32_FH_BASE );
errno = EBADF;
return NULL;
}
f = &_win32_fhs[fd];
if (f->used == 0) {
D( "_fh_from_int: invalid fd %d\n", fd + WIN32_FH_BASE );
errno = EBADF;
return NULL;
}
return f;
}
static int
_fh_to_int( FH f )
{
if (f && f->used && f >= _win32_fhs && f < _win32_fhs + WIN32_MAX_FHS)
return (int)(f - _win32_fhs) + WIN32_FH_BASE;
return -1;
}
static FH
_fh_alloc( FHClass clazz )
{
int nn;
FH f = NULL;
adb_mutex_lock( &_win32_lock );
if (_win32_fh_count < WIN32_MAX_FHS) {
f = &_win32_fhs[ _win32_fh_count++ ];
goto Exit;
}
for (nn = 0; nn < WIN32_MAX_FHS; nn++) {
if ( _win32_fhs[nn].clazz == NULL) {
f = &_win32_fhs[nn];
goto Exit;
}
}
D( "_fh_alloc: no more free file descriptors\n" );
Exit:
if (f) {
f->clazz = clazz;
f->used = 1;
f->eof = 0;
clazz->_fh_init(f);
}
adb_mutex_unlock( &_win32_lock );
return f;
}
static int
_fh_close( FH f )
{
if ( f->used ) {
f->clazz->_fh_close( f );
f->used = 0;
f->eof = 0;
f->clazz = NULL;
}
return 0;
}
/* forward definitions */
static const FHClassRec _fh_file_class;
static const FHClassRec _fh_socket_class;
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** file-based descriptor handling *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
static void
_fh_file_init( FH f )
{
f->fh_handle = INVALID_HANDLE_VALUE;
}
static int
_fh_file_close( FH f )
{
CloseHandle( f->fh_handle );
f->fh_handle = INVALID_HANDLE_VALUE;
return 0;
}
static int
_fh_file_read( FH f, void* buf, int len )
{
DWORD read_bytes;
if ( !ReadFile( f->fh_handle, buf, (DWORD)len, &read_bytes, NULL ) ) {
D( "adb_read: could not read %d bytes from %s\n", len, f->name );
errno = EIO;
return -1;
} else if (read_bytes < (DWORD)len) {
f->eof = 1;
}
return (int)read_bytes;
}
static int
_fh_file_write( FH f, const void* buf, int len )
{
DWORD wrote_bytes;
if ( !WriteFile( f->fh_handle, buf, (DWORD)len, &wrote_bytes, NULL ) ) {
D( "adb_file_write: could not write %d bytes from %s\n", len, f->name );
errno = EIO;
return -1;
} else if (wrote_bytes < (DWORD)len) {
f->eof = 1;
}
return (int)wrote_bytes;
}
static int
_fh_file_lseek( FH f, int pos, int origin )
{
DWORD method;
DWORD result;
switch (origin)
{
case SEEK_SET: method = FILE_BEGIN; break;
case SEEK_CUR: method = FILE_CURRENT; break;
case SEEK_END: method = FILE_END; break;
default:
errno = EINVAL;
return -1;
}
result = SetFilePointer( f->fh_handle, pos, NULL, method );
if (result == INVALID_SET_FILE_POINTER) {
errno = EIO;
return -1;
} else {
f->eof = 0;
}
return (int)result;
}
static void _fh_file_hook( FH f, int event, EventHook eventhook ); /* forward */
static const FHClassRec _fh_file_class =
{
_fh_file_init,
_fh_file_close,
_fh_file_lseek,
_fh_file_read,
_fh_file_write,
_fh_file_hook
};
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** file-based descriptor handling *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
int adb_open(const char* path, int options)
{
FH f;
DWORD desiredAccess = 0;
DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
switch (options) {
case O_RDONLY:
desiredAccess = GENERIC_READ;
break;
case O_WRONLY:
desiredAccess = GENERIC_WRITE;
break;
case O_RDWR:
desiredAccess = GENERIC_READ | GENERIC_WRITE;
break;
default:
D("adb_open: invalid options (0x%0x)\n", options);
errno = EINVAL;
return -1;
}
f = _fh_alloc( &_fh_file_class );
if ( !f ) {
errno = ENOMEM;
return -1;
}
f->fh_handle = CreateFile( path, desiredAccess, shareMode, NULL, OPEN_EXISTING,
0, NULL );
if ( f->fh_handle == INVALID_HANDLE_VALUE ) {
_fh_close(f);
D( "adb_open: could not open '%s':", path );
switch (GetLastError()) {
case ERROR_FILE_NOT_FOUND:
D( "file not found\n" );
errno = ENOENT;
return -1;
case ERROR_PATH_NOT_FOUND:
D( "path not found\n" );
errno = ENOTDIR;
return -1;
default:
D( "unknown error\n" );
errno = ENOENT;
return -1;
}
}
snprintf( f->name, sizeof(f->name), "%d(%s)", _fh_to_int(f), path );
D( "adb_open: '%s' => fd %d\n", path, _fh_to_int(f) );
return _fh_to_int(f);
}
/* ignore mode on Win32 */
int adb_creat(const char* path, int mode)
{
FH f;
f = _fh_alloc( &_fh_file_class );
if ( !f ) {
errno = ENOMEM;
return -1;
}
f->fh_handle = CreateFile( path, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,
NULL );
if ( f->fh_handle == INVALID_HANDLE_VALUE ) {
_fh_close(f);
D( "adb_creat: could not open '%s':", path );
switch (GetLastError()) {
case ERROR_FILE_NOT_FOUND:
D( "file not found\n" );
errno = ENOENT;
return -1;
case ERROR_PATH_NOT_FOUND:
D( "path not found\n" );
errno = ENOTDIR;
return -1;
default:
D( "unknown error\n" );
errno = ENOENT;
return -1;
}
}
snprintf( f->name, sizeof(f->name), "%d(%s)", _fh_to_int(f), path );
D( "adb_creat: '%s' => fd %d\n", path, _fh_to_int(f) );
return _fh_to_int(f);
}
int adb_read(int fd, void* buf, int len)
{
FH f = _fh_from_int(fd);
if (f == NULL) {
return -1;
}
return f->clazz->_fh_read( f, buf, len );
}
int adb_write(int fd, const void* buf, int len)
{
FH f = _fh_from_int(fd);
if (f == NULL) {
return -1;
}
return f->clazz->_fh_write(f, buf, len);
}
int adb_lseek(int fd, int pos, int where)
{
FH f = _fh_from_int(fd);
if (!f) {
return -1;
}
return f->clazz->_fh_lseek(f, pos, where);
}
int adb_close(int fd)
{
FH f = _fh_from_int(fd);
if (!f) {
return -1;
}
D( "adb_close: %s\n", f->name);
_fh_close(f);
return 0;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** socket-based file descriptors *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
static void
_socket_set_errno( void )
{
switch (WSAGetLastError()) {
case 0: errno = 0; break;
case WSAEWOULDBLOCK: errno = EAGAIN; break;
case WSAEINTR: errno = EINTR; break;
default:
D( "_socket_set_errno: unhandled value %d\n", WSAGetLastError() );
errno = EINVAL;
}
}
static void
_fh_socket_init( FH f )
{
f->fh_socket = INVALID_SOCKET;
f->event = WSACreateEvent();
f->mask = 0;
}
static int
_fh_socket_close( FH f )
{
/* gently tell any peer that we're closing the socket */
shutdown( f->fh_socket, SD_BOTH );
closesocket( f->fh_socket );
f->fh_socket = INVALID_SOCKET;
CloseHandle( f->event );
f->mask = 0;
return 0;
}
static int
_fh_socket_lseek( FH f, int pos, int origin )
{
errno = EPIPE;
return -1;
}
static int
_fh_socket_read( FH f, void* buf, int len )
{
int result = recv( f->fh_socket, buf, len, 0 );
if (result == SOCKET_ERROR) {
_socket_set_errno();
result = -1;
}
return result;
}
static int
_fh_socket_write( FH f, const void* buf, int len )
{
int result = send( f->fh_socket, buf, len, 0 );
if (result == SOCKET_ERROR) {
_socket_set_errno();
result = -1;
}
return result;
}
static void _fh_socket_hook( FH f, int event, EventHook hook ); /* forward */
static const FHClassRec _fh_socket_class =
{
_fh_socket_init,
_fh_socket_close,
_fh_socket_lseek,
_fh_socket_read,
_fh_socket_write,
_fh_socket_hook
};
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** replacement for libs/cutils/socket_xxxx.c *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
#include <winsock2.h>
static int _winsock_init;
static void
_cleanup_winsock( void )
{
WSACleanup();
}
static void
_init_winsock( void )
{
if (!_winsock_init) {
WSADATA wsaData;
int rc = WSAStartup( MAKEWORD(2,2), &wsaData);
if (rc != 0) {
fatal( "adb: could not initialize Winsock\n" );
}
atexit( _cleanup_winsock );
_winsock_init = 1;
}
}
int socket_loopback_client(int port, int type)
{
FH f = _fh_alloc( &_fh_socket_class );
struct sockaddr_in addr;
SOCKET s;
if (!f)
return -1;
if (!_winsock_init)
_init_winsock();
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
s = socket(AF_INET, type, 0);
if(s == INVALID_SOCKET) {
D("socket_loopback_client: could not create socket\n" );
_fh_close(f);
return -1;
}
f->fh_socket = s;
if(connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
D("socket_loopback_client: could not connect to %s:%d\n", type != SOCK_STREAM ? "udp" : "tcp", port );
_fh_close(f);
return -1;
}
snprintf( f->name, sizeof(f->name), "%d(lo-client:%s%d)", _fh_to_int(f), type != SOCK_STREAM ? "udp:" : "", port );
D( "socket_loopback_client: port %d type %s => fd %d\n", port, type != SOCK_STREAM ? "udp" : "tcp", _fh_to_int(f) );
return _fh_to_int(f);
}
#define LISTEN_BACKLOG 4
int socket_loopback_server(int port, int type)
{
FH f = _fh_alloc( &_fh_socket_class );
struct sockaddr_in addr;
SOCKET s;
int n;
if (!f) {
return -1;
}
if (!_winsock_init)
_init_winsock();
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
s = socket(AF_INET, type, 0);
if(s == INVALID_SOCKET) return -1;
f->fh_socket = s;
n = 1;
setsockopt(s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (const char*)&n, sizeof(n));
if(bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
_fh_close(f);
return -1;
}
if (type == SOCK_STREAM) {
int ret;
ret = listen(s, LISTEN_BACKLOG);
if (ret < 0) {
_fh_close(f);
return -1;
}
}
snprintf( f->name, sizeof(f->name), "%d(lo-server:%s%d)", _fh_to_int(f), type != SOCK_STREAM ? "udp:" : "", port );
D( "socket_loopback_server: port %d type %s => fd %d\n", port, type != SOCK_STREAM ? "udp" : "tcp", _fh_to_int(f) );
return _fh_to_int(f);
}
int socket_network_client(const char *host, int port, int type)
{
FH f = _fh_alloc( &_fh_socket_class );
struct hostent *hp;
struct sockaddr_in addr;
SOCKET s;
if (!f)
return -1;
if (!_winsock_init)
_init_winsock();
hp = gethostbyname(host);
if(hp == 0) {
_fh_close(f);
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = hp->h_addrtype;
addr.sin_port = htons(port);
memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
s = socket(hp->h_addrtype, type, 0);
if(s == INVALID_SOCKET) {
_fh_close(f);
return -1;
}
f->fh_socket = s;
if(connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
_fh_close(f);
return -1;
}
snprintf( f->name, sizeof(f->name), "%d(net-client:%s%d)", _fh_to_int(f), type != SOCK_STREAM ? "udp:" : "", port );
D( "socket_network_client: host '%s' port %d type %s => fd %d\n", host, port, type != SOCK_STREAM ? "udp" : "tcp", _fh_to_int(f) );
return _fh_to_int(f);
}
int socket_inaddr_any_server(int port, int type)
{
FH f = _fh_alloc( &_fh_socket_class );
struct sockaddr_in addr;
SOCKET s;
int n;
if (!f)
return -1;
if (!_winsock_init)
_init_winsock();
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
s = socket(AF_INET, type, 0);
if(s == INVALID_SOCKET) {
_fh_close(f);
return -1;
}
f->fh_socket = s;
n = 1;
setsockopt(s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (const char*)&n, sizeof(n));
if(bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
_fh_close(f);
return -1;
}
if (type == SOCK_STREAM) {
int ret;
ret = listen(s, LISTEN_BACKLOG);
if (ret < 0) {
_fh_close(f);
return -1;
}
}
snprintf( f->name, sizeof(f->name), "%d(any-server:%s%d)", _fh_to_int(f), type != SOCK_STREAM ? "udp:" : "", port );
D( "socket_inaddr_server: port %d type %s => fd %d\n", port, type != SOCK_STREAM ? "udp" : "tcp", _fh_to_int(f) );
return _fh_to_int(f);
}
#undef accept
int adb_socket_accept(int serverfd, struct sockaddr* addr, socklen_t *addrlen)
{
FH serverfh = _fh_from_int(serverfd);
FH fh;
if ( !serverfh || serverfh->clazz != &_fh_socket_class ) {
D( "adb_socket_accept: invalid fd %d\n", serverfd );
return -1;
}
fh = _fh_alloc( &_fh_socket_class );
if (!fh) {
D( "adb_socket_accept: not enough memory to allocate accepted socket descriptor\n" );
return -1;
}
fh->fh_socket = accept( serverfh->fh_socket, addr, addrlen );
if (fh->fh_socket == INVALID_SOCKET) {
_fh_close( fh );
D( "adb_socket_accept: accept on fd %d return error %ld\n", serverfd, GetLastError() );
return -1;
}
snprintf( fh->name, sizeof(fh->name), "%d(accept:%s)", _fh_to_int(fh), serverfh->name );
D( "adb_socket_accept on fd %d returns fd %d\n", serverfd, _fh_to_int(fh) );
return _fh_to_int(fh);
}
void disable_tcp_nagle(int fd)
{
FH fh = _fh_from_int(fd);
int on;
if ( !fh || fh->clazz != &_fh_socket_class )
return;
setsockopt( fh->fh_socket, IPPROTO_TCP, TCP_NODELAY, (const char*)&on, sizeof(on) );
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** emulated socketpairs *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
/* we implement socketpairs directly in use space for the following reasons:
* - it avoids copying data from/to the Nt kernel
* - it allows us to implement fdevent hooks easily and cheaply, something
* that is not possible with standard Win32 pipes !!
*
* basically, we use two circular buffers, each one corresponding to a given
* direction.
*
* each buffer is implemented as two regions:
*
* region A which is (a_start,a_end)
* region B which is (0, b_end) with b_end <= a_start
*
* an empty buffer has: a_start = a_end = b_end = 0
*
* a_start is the pointer where we start reading data
* a_end is the pointer where we start writing data, unless it is BUFFER_SIZE,
* then you start writing at b_end
*
* the buffer is full when b_end == a_start && a_end == BUFFER_SIZE
*
* there is room when b_end < a_start || a_end < BUFER_SIZE
*
* when reading, a_start is incremented, it a_start meets a_end, then
* we do: a_start = 0, a_end = b_end, b_end = 0, and keep going on..
*/
#define BIP_BUFFER_SIZE 4096
#if 0
#include <stdio.h>
# define BIPD(x) D x
# define BIPDUMP bip_dump_hex
static void bip_dump_hex( const unsigned char* ptr, size_t len )
{
int nn, len2 = len;
if (len2 > 8) len2 = 8;
for (nn = 0; nn < len2; nn++)
printf("%02x", ptr[nn]);
printf(" ");
for (nn = 0; nn < len2; nn++) {
int c = ptr[nn];
if (c < 32 || c > 127)
c = '.';
printf("%c", c);
}
printf("\n");
fflush(stdout);
}
#else
# define BIPD(x) do {} while (0)
# define BIPDUMP(p,l) BIPD(p)
#endif
typedef struct BipBufferRec_
{
int a_start;
int a_end;
int b_end;
int fdin;
int fdout;
int closed;
int can_write; /* boolean */
HANDLE evt_write; /* event signaled when one can write to a buffer */
int can_read; /* boolean */
HANDLE evt_read; /* event signaled when one can read from a buffer */
CRITICAL_SECTION lock;
unsigned char buff[ BIP_BUFFER_SIZE ];
} BipBufferRec, *BipBuffer;
static void
bip_buffer_init( BipBuffer buffer )
{
D( "bit_buffer_init %p\n", buffer );
buffer->a_start = 0;
buffer->a_end = 0;
buffer->b_end = 0;
buffer->can_write = 1;
buffer->can_read = 0;
buffer->fdin = 0;
buffer->fdout = 0;
buffer->closed = 0;
buffer->evt_write = CreateEvent( NULL, TRUE, TRUE, NULL );
buffer->evt_read = CreateEvent( NULL, TRUE, FALSE, NULL );
InitializeCriticalSection( &buffer->lock );
}
static void
bip_buffer_close( BipBuffer bip )
{
bip->closed = 1;
if (!bip->can_read) {
SetEvent( bip->evt_read );
}
if (!bip->can_write) {
SetEvent( bip->evt_write );
}
}
static void
bip_buffer_done( BipBuffer bip )
{
BIPD(( "bip_buffer_done: %d->%d\n", bip->fdin, bip->fdout ));
CloseHandle( bip->evt_read );
CloseHandle( bip->evt_write );
DeleteCriticalSection( &bip->lock );
}
static int
bip_buffer_write( BipBuffer bip, const void* src, int len )
{
int avail, count = 0;
if (len <= 0)
return 0;
BIPD(( "bip_buffer_write: enter %d->%d len %d\n", bip->fdin, bip->fdout, len ));
BIPDUMP( src, len );
EnterCriticalSection( &bip->lock );
while (!bip->can_write) {
int ret;
LeaveCriticalSection( &bip->lock );
if (bip->closed) {
errno = EPIPE;
return -1;
}
/* spinlocking here is probably unfair, but let's live with it */
ret = WaitForSingleObject( bip->evt_write, INFINITE );
if (ret != WAIT_OBJECT_0) { /* buffer probably closed */
D( "bip_buffer_write: error %d->%d WaitForSingleObject returned %d, error %ld\n", bip->fdin, bip->fdout, ret, GetLastError() );
return 0;
}
if (bip->closed) {
errno = EPIPE;
return -1;
}
EnterCriticalSection( &bip->lock );
}
BIPD(( "bip_buffer_write: exec %d->%d len %d\n", bip->fdin, bip->fdout, len ));
avail = BIP_BUFFER_SIZE - bip->a_end;
if (avail > 0)
{
/* we can append to region A */
if (avail > len)
avail = len;
memcpy( bip->buff + bip->a_end, src, avail );
src += avail;
count += avail;
len -= avail;
bip->a_end += avail;
if (bip->a_end == BIP_BUFFER_SIZE && bip->a_start == 0) {
bip->can_write = 0;
ResetEvent( bip->evt_write );
goto Exit;
}
}
if (len == 0)
goto Exit;
avail = bip->a_start - bip->b_end;
assert( avail > 0 ); /* since can_write is TRUE */
if (avail > len)
avail = len;
memcpy( bip->buff + bip->b_end, src, avail );
count += avail;
bip->b_end += avail;
if (bip->b_end == bip->a_start) {
bip->can_write = 0;
ResetEvent( bip->evt_write );
}
Exit:
assert( count > 0 );
if ( !bip->can_read ) {
bip->can_read = 1;
SetEvent( bip->evt_read );
}
BIPD(( "bip_buffer_write: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d\n",
bip->fdin, bip->fdout, count, bip->a_start, bip->a_end, bip->b_end, bip->can_write, bip->can_read ));
LeaveCriticalSection( &bip->lock );
return count;
}
static int
bip_buffer_read( BipBuffer bip, void* dst, int len )
{
int avail, count = 0;
if (len <= 0)
return 0;
BIPD(( "bip_buffer_read: enter %d->%d len %d\n", bip->fdin, bip->fdout, len ));
EnterCriticalSection( &bip->lock );