diff options
Diffstat (limited to 'windows/select-cli.c')
-rw-r--r-- | windows/select-cli.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/windows/select-cli.c b/windows/select-cli.c new file mode 100644 index 00000000..9bf8411e --- /dev/null +++ b/windows/select-cli.c @@ -0,0 +1,78 @@ +/* + * Implementation of do_select() for network.c to use, suitable for use + * when there's no GUI window to have network activity reported to. + * + * It uses WSAEventSelect, where available, to convert network + * activity into activity on an event object, for integration into an + * event loop that includes WaitForMultipleObjects. + * + * It also maintains a list of currently active sockets, which can be + * retrieved by a front end that wants to use WinSock's synchronous + * select() function. + */ + +#include "putty.h" + +static tree234 *winselcli_sockets; + +static int socket_cmp(void *av, void *bv) +{ + return memcmp(av, bv, sizeof(SOCKET)); +} + +HANDLE winselcli_event = INVALID_HANDLE_VALUE; + +void winselcli_setup(void) +{ + if (!winselcli_sockets) + winselcli_sockets = newtree234(socket_cmp); + + if (p_WSAEventSelect && winselcli_event == INVALID_HANDLE_VALUE) + winselcli_event = CreateEvent(NULL, false, false, NULL); +} + +SOCKET winselcli_unique_socket(void) +{ + if (!winselcli_sockets) + return INVALID_SOCKET; + + assert(count234(winselcli_sockets) <= 1); + + SOCKET *p = index234(winselcli_sockets, 0); + if (!p) + return INVALID_SOCKET; + + return *p; +} + +const char *do_select(SOCKET skt, bool enable) +{ + /* Check everything's been set up, for convenience of callers. */ + winselcli_setup(); + + if (enable) { + SOCKET *ptr = snew(SOCKET); + *ptr = skt; + if (add234(winselcli_sockets, ptr) != ptr) + sfree(ptr); /* already there */ + } else { + SOCKET *ptr = del234(winselcli_sockets, &skt); + if (ptr) + sfree(ptr); + } + + if (p_WSAEventSelect) { + int events; + if (enable) { + events = (FD_CONNECT | FD_READ | FD_WRITE | + FD_OOB | FD_CLOSE | FD_ACCEPT); + } else { + events = 0; + } + + if (p_WSAEventSelect(skt, winselcli_event, events) == SOCKET_ERROR) + return winsock_error_string(p_WSAGetLastError()); + } + + return NULL; +} |