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Added GSocket_Select()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3612 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Guillermo Rodriguez Garcia
1999-09-11 20:17:49 +00:00
parent 483c6690e9
commit ef25e6386d
1 changed files with 62 additions and 18 deletions
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70
src/unix/gsocket.c
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@@ -524,27 +524,71 @@ int GSocket_Write(GSocket *socket, const char *buffer,
return _GSocket_Send_Dgram(socket, buffer, size);
}
bool GSocket_DataAvailable(GSocket *socket)
/* GSocket_Select:
* Polls the socket to determine its status. This function will
* check for the events specified in the 'flags' parameter, and
* it will return a mask indicating which operations can be
* performed. This function won't block, regardless of the
* mode (blocking|nonblocking) of the socket.
*/
GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags)
{
fd_set read_set;
fd_set readfds, writefds, exceptfds;
struct timeval tv;
GSocketEventFlags mask;
int error, len;
assert(socket != NULL);
if (socket->m_fd == -1 || socket->m_server) {
if (socket->m_fd == -1)
{
socket->m_error = GSOCK_INVSOCK;
return FALSE;
}
FD_ZERO(&read_set);
FD_SET(socket->m_fd, &read_set);
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
FD_SET(socket->m_fd, &readfds);
FD_SET(socket->m_fd, &writefds);
FD_SET(socket->m_fd, &exceptfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
select(socket->m_fd + 1, &readfds, &writefds, &exceptfds, &tv);
select(socket->m_fd+1, &read_set, NULL, NULL, &tv);
mask = 0;
return FD_ISSET(socket->m_fd, &read_set);
/* If select() says that the socket is readable, then we have
* no way to distinguish if that means 'data available' (to
* recv) or 'incoming connection' (to accept). The same goes
* for writability: we cannot distinguish between 'you can
* send data' and 'connection request completed'. So we will
* assume the following: if the flag was set upon entry,
* that means that the event was possible.
*/
if (FD_ISSET(socket->m_fd, &readfds))
{
mask |= (flags & GSOCK_CONNECTION_FLAG);
mask |= (flags & GSOCK_INPUT_FLAG);
}
if (FD_ISSET(socket->m_fd, &writefds))
{
if (socket->m_establishing)
{
getsockopt(socket->m_fd, SOL_SOCKET, SO_ERROR, &error, &len);
if (error)
mask |= (flags & GSOCK_LOST_FLAG);
else
mask |= (flags & GSOCK_CONNECTION_FLAG);
}
mask |= (flags & GSOCK_OUTPUT_FLAG);
}
if (FD_ISSET(socket->m_fd, &exceptfds))
mask |= (flags & GSOCK_LOST_FLAG);
return mask;
}
/* Flags */
@@ -606,7 +650,7 @@ GSocketError GSocket_GetError(GSocket *socket)
For example: INPUT -> GSocket_Read()
CONNECTION -> GSocket_Accept()
*/
void GSocket_SetCallback(GSocket *socket, GSocketEventFlags event,
void GSocket_SetCallback(GSocket *socket, GSocketEventFlags flags,
GSocketCallback callback, char *cdata)
{
int count;
@@ -616,7 +660,7 @@ void GSocket_SetCallback(GSocket *socket, GSocketEventFlags event,
for (count=0;count<GSOCK_MAX_EVENT;count++) {
/* We test each flag and, if it is enabled, we enable the corresponding
event */
if ((event & (1 << count)) != 0) {
if ((flags & (1 << count)) != 0) {
socket->m_cbacks[count] = callback;
socket->m_data[count] = cdata;
_GSocket_Enable(socket, count);
@@ -625,17 +669,17 @@ void GSocket_SetCallback(GSocket *socket, GSocketEventFlags event,
}
/*
UnsetCallback will disables all callbacks specified by "event".
NOTE: event may be a combination of flags
UnsetCallback will disables all callbacks specified by "flags".
NOTE: "flags" may be a combination of flags
*/
void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags event)
void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags flags)
{
int count = 0;
assert(socket != NULL);
for (count=0;count<GSOCK_MAX_EVENT;count++) {
if ((event & (1 << count)) != 0) {
if ((flags & (1 << count)) != 0) {
_GSocket_Disable(socket, count);
socket->m_cbacks[count] = NULL;
}