/[dtapublic]/projs/trunk/shared_source/c_tcl_base_7_5_w_mods/tcliosock.c
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Sun Oct 30 04:21:11 2016 UTC (7 years, 8 months ago) by dashley
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1 dashley 64 /*$Header$ */
2 dashley 25 /*
3     * tclIOSock.c --
4     *
5     * Common routines used by all socket based channel types.
6     *
7     * Copyright (c) 1995-1997 Sun Microsystems, Inc.
8     *
9     * See the file "license.terms" for information on usage and redistribution
10     * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
11     *
12     * RCS: @(#) $Id: tcliosock.c,v 1.1.1.1 2001/06/13 04:42:17 dtashley Exp $
13     */
14    
15     #include "tclInt.h"
16     #include "tclPort.h"
17    
18     /*
19     *---------------------------------------------------------------------------
20     *
21     * TclSockGetPort --
22     *
23     * Maps from a string, which could be a service name, to a port.
24     * Used by socket creation code to get port numbers and resolve
25     * registered service names to port numbers.
26     *
27     * Results:
28     * A standard Tcl result. On success, the port number is returned
29     * in portPtr. On failure, an error message is left in the interp's
30     * result.
31     *
32     * Side effects:
33     * None.
34     *
35     *---------------------------------------------------------------------------
36     */
37    
38     int
39     TclSockGetPort(interp, string, proto, portPtr)
40     Tcl_Interp *interp;
41     char *string; /* Integer or service name */
42     char *proto; /* "tcp" or "udp", typically */
43     int *portPtr; /* Return port number */
44     {
45     struct servent *sp; /* Protocol info for named services */
46     Tcl_DString ds;
47     char *native;
48    
49     if (Tcl_GetInt(NULL, string, portPtr) != TCL_OK) {
50     /*
51     * Don't bother translating 'proto' to native.
52     */
53    
54     native = Tcl_UtfToExternalDString(NULL, string, -1, &ds);
55     sp = getservbyname(native, proto); /* INTL: Native. */
56     Tcl_DStringFree(&ds);
57     if (sp != NULL) {
58     *portPtr = ntohs((unsigned short) sp->s_port);
59     return TCL_OK;
60     }
61     }
62     if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {
63     return TCL_ERROR;
64     }
65     if (*portPtr > 0xFFFF) {
66     Tcl_AppendResult(interp, "couldn't open socket: port number too high",
67     (char *) NULL);
68     return TCL_ERROR;
69     }
70     return TCL_OK;
71     }
72    
73     /*
74     *----------------------------------------------------------------------
75     *
76     * TclSockMinimumBuffers --
77     *
78     * Ensure minimum buffer sizes (non zero).
79     *
80     * Results:
81     * A standard Tcl result.
82     *
83     * Side effects:
84     * Sets SO_SNDBUF and SO_RCVBUF sizes.
85     *
86     *----------------------------------------------------------------------
87     */
88    
89     int
90     TclSockMinimumBuffers(sock, size)
91     int sock; /* Socket file descriptor */
92     int size; /* Minimum buffer size */
93     {
94     int current;
95     /*
96     * Should be socklen_t, but HP10.20 (g)cc chokes
97     */
98     size_t len;
99    
100     len = sizeof(int);
101     getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&current, &len);
102     if (current < size) {
103     len = sizeof(int);
104     setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&size, len);
105     }
106     len = sizeof(int);
107     getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&current, &len);
108     if (current < size) {
109     len = sizeof(int);
110     setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&size, len);
111     }
112     return TCL_OK;
113     }
114    
115 dashley 64 /* End of tcliosock.c */

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