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-rw-r--r--generic/tclIOSock.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/generic/tclIOSock.c b/generic/tclIOSock.c
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+/*
+ * tclIOSock.c --
+ *
+ * Common routines used by all socket based channel types.
+ *
+ * Copyright (c) 1995 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tclIOSock.c 1.20 97/04/25 16:36:40
+ */
+
+#include "tclInt.h"
+#include "tclPort.h"
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclSockGetPort --
+ *
+ * Maps from a string, which could be a service name, to a port.
+ * Used by socket creation code to get port numbers and resolve
+ * registered service names to port numbers.
+ *
+ * Results:
+ * A standard Tcl result. On success, the port number is
+ * returned in portPtr. On failure, an error message is left in
+ * interp->result.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclSockGetPort(interp, string, proto, portPtr)
+ Tcl_Interp *interp;
+ char *string; /* Integer or service name */
+ char *proto; /* "tcp" or "udp", typically */
+ int *portPtr; /* Return port number */
+{
+ struct servent *sp; /* Protocol info for named services */
+ if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {
+ sp = getservbyname(string, proto);
+ if (sp != NULL) {
+ *portPtr = ntohs((unsigned short) sp->s_port);
+ Tcl_ResetResult(interp); /* clear error message */
+ return TCL_OK;
+ }
+ return TCL_ERROR;
+ }
+ if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if (*portPtr > 0xFFFF) {
+ Tcl_AppendResult(interp, "couldn't open socket: port number too high",
+ (char *) NULL);
+ return TCL_ERROR;
+ }
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TclSockMinimumBuffers --
+ *
+ * Ensure minimum buffer sizes (non zero).
+ *
+ * Results:
+ * A standard Tcl result.
+ *
+ * Side effects:
+ * Sets SO_SNDBUF and SO_RCVBUF sizes.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+TclSockMinimumBuffers(sock, size)
+ int sock; /* Socket file descriptor */
+ int size; /* Minimum buffer size */
+{
+ int current;
+ int len;
+
+ len = sizeof(int);
+ getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&current, &len);
+ if (current < size) {
+ len = sizeof(int);
+ setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&size, len);
+ }
+ len = sizeof(int);
+ getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&current, &len);
+ if (current < size) {
+ len = sizeof(int);
+ setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&size, len);
+ }
+ return TCL_OK;
+}