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ws2_32: Convert WS_select to use poll() instead of select(). Also fixes an fd leak.

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This commit is contained in:
Alexandre Julliard 2006-11-06 12:28:53 +01:00
parent f0ca586f16
commit 0082973d93
1 changed files with 109 additions and 107 deletions
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216
dlls/ws2_32/socket.c
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@ -589,31 +589,6 @@ static char *strdup_lower(const char *str)
return ret;
}
static fd_set* fd_set_import( fd_set* fds, const WS_fd_set* wsfds, int access, int* highfd, int lfd[] )
{
/* translate Winsock fd set into local fd set */
if( wsfds )
{
unsigned int i;
FD_ZERO(fds);
for( i = 0; i < wsfds->fd_count; i++ )
{
int s = wsfds->fd_array[i];
int fd = get_sock_fd( s, access, NULL );
if (fd != -1)
{
lfd[ i ] = fd;
if( fd > *highfd ) *highfd = fd;
FD_SET(fd, fds);
}
else lfd[ i ] = -1;
}
return fds;
}
return NULL;
}
inline static int sock_error_p(int s)
{
unsigned int optval, optlen;
@ -624,50 +599,6 @@ inline static int sock_error_p(int s)
return optval != 0;
}
static int fd_set_export( const fd_set* fds, fd_set* exceptfds, WS_fd_set* wsfds, int lfd[] )
{
int num_err = 0;
/* translate local fd set into Winsock fd set, adding
* errors to exceptfds (only if app requested it) */
if( wsfds )
{
int i, j, count = wsfds->fd_count;
for( i = 0, j = 0; i < count; i++ )
{
int fd = lfd[i];
SOCKET s = wsfds->fd_array[i];
if (fd == -1) continue;
if( FD_ISSET(fd, fds) )
{
if ( exceptfds && sock_error_p(fd) )
{
FD_SET(fd, exceptfds);
num_err++;
}
else wsfds->fd_array[j++] = s;
}
release_sock_fd( s, fd );
}
wsfds->fd_count = j;
}
return num_err;
}
static void fd_set_unimport( WS_fd_set* wsfds, int lfd[] )
{
if ( wsfds )
{
unsigned int i;
for ( i = 0; i < wsfds->fd_count; i++ )
if ( lfd[i] >= 0 ) release_sock_fd( wsfds->fd_array[i], lfd[i] );
wsfds->fd_count = 0;
}
}
/* Utility: get the SO_RCVTIMEO or SO_SNDTIMEO socket option
* from an fd and return the value converted to milli seconds
* or -1 if there is an infinite time out */
@ -2437,6 +2368,103 @@ int WINAPI WS_recvfrom(SOCKET s, char *buf, INT len, int flags,
return n;
}
/* allocate a poll array for the corresponding fd sets */
static struct pollfd *fd_sets_to_poll( const WS_fd_set *readfds, const WS_fd_set *writefds,
const WS_fd_set *exceptfds, int *count_ptr )
{
int i, j = 0, count = 0;
struct pollfd *fds;
if (readfds) count += readfds->fd_count;
if (writefds) count += writefds->fd_count;
if (exceptfds) count += exceptfds->fd_count;
*count_ptr = count;
if (!count) return NULL;
if (!(fds = HeapAlloc( GetProcessHeap(), 0, count * sizeof(fds[0])))) return NULL;
if (readfds)
for (i = 0; i < readfds->fd_count; i++, j++)
{
fds[j].fd = get_sock_fd( readfds->fd_array[i], FILE_READ_DATA, NULL );
fds[j].events = POLLIN;
fds[j].revents = 0;
}
if (writefds)
for (i = 0; i < writefds->fd_count; i++, j++)
{
fds[j].fd = get_sock_fd( writefds->fd_array[i], FILE_WRITE_DATA, NULL );
fds[j].events = POLLOUT;
fds[j].revents = 0;
}
if (exceptfds)
for (i = 0; i < exceptfds->fd_count; i++, j++)
{
fds[j].fd = get_sock_fd( exceptfds->fd_array[i], 0, NULL );
fds[j].events = POLLHUP;
fds[j].revents = 0;
}
return fds;
}
/* release the file descriptor obtained in fd_sets_to_poll */
/* must be called with the original fd_set arrays, before calling get_poll_results */
static void release_poll_fds( const WS_fd_set *readfds, const WS_fd_set *writefds,
const WS_fd_set *exceptfds, struct pollfd *fds )
{
int i, j = 0;
if (readfds)
{
for (i = 0; i < readfds->fd_count; i++, j++)
if (fds[j].fd != -1) release_sock_fd( readfds->fd_array[i], fds[j].fd );
}
if (writefds)
{
for (i = 0; i < writefds->fd_count; i++, j++)
if (fds[j].fd != -1) release_sock_fd( writefds->fd_array[i], fds[j].fd );
}
if (exceptfds)
{
for (i = 0; i < exceptfds->fd_count; i++, j++)
if (fds[j].fd != -1)
{
/* make sure we have a real error before releasing the fd */
if (!sock_error_p( fds[j].fd )) fds[j].revents = 0;
release_sock_fd( exceptfds->fd_array[i], fds[j].fd );
}
}
}
/* map the poll results back into the Windows fd sets */
static int get_poll_results( WS_fd_set *readfds, WS_fd_set *writefds, WS_fd_set *exceptfds,
const struct pollfd *fds )
{
int i, j = 0, k, total = 0;
if (readfds)
{
for (i = k = 0; i < readfds->fd_count; i++, j++)
if (fds[j].revents) readfds->fd_array[k++] = readfds->fd_array[i];
readfds->fd_count = k;
total += k;
}
if (writefds)
{
for (i = k = 0; i < writefds->fd_count; i++, j++)
if (fds[j].revents) writefds->fd_array[k++] = writefds->fd_array[i];
writefds->fd_count = k;
total += k;
}
if (exceptfds)
{
for (i = k = 0; i < exceptfds->fd_count; i++, j++)
if (fds[j].revents) exceptfds->fd_array[k++] = exceptfds->fd_array[i];
exceptfds->fd_count = k;
total += k;
}
return total;
}
/***********************************************************************
* select (WS2_32.18)
*/
@ -2444,53 +2472,27 @@ int WINAPI WS_select(int nfds, WS_fd_set *ws_readfds,
WS_fd_set *ws_writefds, WS_fd_set *ws_exceptfds,
const struct WS_timeval* ws_timeout)
{
int highfd = 0;
fd_set readfds, writefds, exceptfds;
fd_set *p_read, *p_write, *p_except;
int readfd[FD_SETSIZE], writefd[FD_SETSIZE], exceptfd[FD_SETSIZE];
struct timeval timeout, *timeoutaddr = NULL;
struct pollfd *pollfds;
int count, ret, timeout = -1;
TRACE("read %p, write %p, excp %p timeout %p\n",
ws_readfds, ws_writefds, ws_exceptfds, ws_timeout);
p_read = fd_set_import(&readfds, ws_readfds, FILE_READ_DATA, &highfd, readfd);
p_write = fd_set_import(&writefds, ws_writefds, FILE_WRITE_DATA, &highfd, writefd);
p_except = fd_set_import(&exceptfds, ws_exceptfds, 0, &highfd, exceptfd);
if (ws_timeout)
if (!(pollfds = fd_sets_to_poll( ws_readfds, ws_writefds, ws_exceptfds, &count )) && count)
{
timeoutaddr = &timeout;
timeout.tv_sec=ws_timeout->tv_sec;
timeout.tv_usec=ws_timeout->tv_usec;
SetLastError( ERROR_NOT_ENOUGH_MEMORY );
return -1;
}
if( (highfd = select(highfd + 1, p_read, p_write, p_except, timeoutaddr)) > 0 )
{
fd_set_export(&readfds, p_except, ws_readfds, readfd);
fd_set_export(&writefds, p_except, ws_writefds, writefd);
if (ws_timeout) timeout = (ws_timeout->tv_sec * 1000) + (ws_timeout->tv_usec + 999) / 1000;
if (p_except && ws_exceptfds)
{
unsigned int i, j;
ret = poll( pollfds, count, timeout );
release_poll_fds( ws_readfds, ws_writefds, ws_exceptfds, pollfds );
for (i = j = 0; i < ws_exceptfds->fd_count; i++)
{
int fd = exceptfd[i];
SOCKET s = ws_exceptfds->fd_array[i];
if (fd == -1) continue;
if (FD_ISSET(fd, &exceptfds)) ws_exceptfds->fd_array[j++] = s;
release_sock_fd( s, fd );
}
ws_exceptfds->fd_count = j;
}
return highfd;
}
fd_set_unimport(ws_readfds, readfd);
fd_set_unimport(ws_writefds, writefd);
fd_set_unimport(ws_exceptfds, exceptfd);
if( highfd == 0 ) return 0;
SetLastError(wsaErrno());
return SOCKET_ERROR;
if (ret == -1) SetLastError(wsaErrno());
else ret = get_poll_results( ws_readfds, ws_writefds, ws_exceptfds, pollfds );
HeapFree( GetProcessHeap(), 0, pollfds );
return ret;
}