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[/] [or1k/] [trunk/] [insight/] [tcl/] [unix/] [tclUnixSock.c] - Blame information for rev 1774

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/*
 * tclUnixSock.c --
 *
 *      This file contains Unix-specific socket related code.
 *
 * 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.
 *
 * RCS: @(#) $Id: tclUnixSock.c,v 1.1.1.1 2002-01-16 10:25:37 markom Exp $
 */
 
#include "tcl.h"
#include "tclPort.h"
 
/*
 * There is no portable macro for the maximum length
 * of host names returned by gethostbyname().  We should only
 * trust SYS_NMLN if it is at least 255 + 1 bytes to comply with DNS
 * host name limits.
 *
 * Note:  SYS_NMLN is a restriction on "uname" not on gethostbyname!
 *
 * For example HP-UX 10.20 has SYS_NMLN == 9,  while gethostbyname()
 * can return a fully qualified name from DNS of up to 255 bytes.
 *
 * Fix suggested by Viktor Dukhovni (viktor@esm.com)
 */
 
#if defined(SYS_NMLN) && SYS_NMLEN >= 256
#define TCL_HOSTNAME_LEN SYS_NMLEN
#else
#define TCL_HOSTNAME_LEN 256
#endif
 
 
/*
 * The following variable holds the network name of this host.
 */
 
static char hostname[TCL_HOSTNAME_LEN + 1];
static int  hostnameInited = 0;
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetHostName --
 *
 *      Returns the name of the local host.
 *
 * Results:
 *      A string containing the network name for this machine, or
 *      an empty string if we can't figure out the name.  The caller
 *      must not modify or free this string.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */
 
char *
Tcl_GetHostName()
{
#ifndef NO_UNAME
    struct utsname u;
    struct hostent *hp;
#endif
 
    if (hostnameInited) {
        return hostname;
    }
 
#ifndef NO_UNAME
    (VOID *) memset((VOID *) &u, (int) 0, sizeof(struct utsname));
    if (uname(&u) > -1) {
        hp = gethostbyname(u.nodename);
        if (hp != NULL) {
            strcpy(hostname, hp->h_name);
        } else {
            strcpy(hostname, u.nodename);
        }
        hostnameInited = 1;
        return hostname;
    }
#else
    /*
     * Uname doesn't exist; try gethostname instead.
     */
 
    if (gethostname(hostname, sizeof(hostname)) > -1) {
        hostnameInited = 1;
        return hostname;
    }
#endif
 
    hostname[0] = 0;
    return hostname;
}

Line No.	Rev	Author	Line
1	578	markom	`/*`
2			`* tclUnixSock.c --`
3			`*`
4			`* This file contains Unix-specific socket related code.`
5			`*`
6			`* Copyright (c) 1995 Sun Microsystems, Inc.`
7			`*`
8			`* See the file "license.terms" for information on usage and redistribution`
9			`* of this file, and for a DISCLAIMER OF ALL WARRANTIES.`
10			`*`
11			`* RCS: @(#) $Id: tclUnixSock.c,v 1.1.1.1 2002-01-16 10:25:37 markom Exp $`
12			`*/`
13
14			`#include "tcl.h"`
15			`#include "tclPort.h"`
16
17			`/*`
18			`* There is no portable macro for the maximum length`
19			`* of host names returned by gethostbyname(). We should only`
20			`* trust SYS_NMLN if it is at least 255 + 1 bytes to comply with DNS`
21			`* host name limits.`
22			`*`
23			`* Note: SYS_NMLN is a restriction on "uname" not on gethostbyname!`
24			`*`
25			`* For example HP-UX 10.20 has SYS_NMLN == 9, while gethostbyname()`
26			`* can return a fully qualified name from DNS of up to 255 bytes.`
27			`*`
28			`* Fix suggested by Viktor Dukhovni (viktor@esm.com)`
29			`*/`
30
31			`#if defined(SYS_NMLN) && SYS_NMLEN >= 256`
32			`#define TCL_HOSTNAME_LEN SYS_NMLEN`
33			`#else`
34			`#define TCL_HOSTNAME_LEN 256`
35			`#endif`
36
37
38			`/*`
39			`* The following variable holds the network name of this host.`
40			`*/`
41
42			`static char hostname[TCL_HOSTNAME_LEN + 1];`
43			`static int hostnameInited = 0;`
44
45			`/*`
46			`*----------------------------------------------------------------------`
47			`*`
48			`* Tcl_GetHostName --`
49			`*`
50			`* Returns the name of the local host.`
51			`*`
52			`* Results:`
53			`* A string containing the network name for this machine, or`
54			`* an empty string if we can't figure out the name. The caller`
55			`* must not modify or free this string.`
56			`*`
57			`* Side effects:`
58			`* None.`
59			`*`
60			`*----------------------------------------------------------------------`
61			`*/`
62
63			`char *`
64			`Tcl_GetHostName()`
65			`{`
66			`#ifndef NO_UNAME`
67			`struct utsname u;`
68			`struct hostent *hp;`
69			`#endif`
70
71			`if (hostnameInited) {`
72			`return hostname;`
73			`}`
74
75			`#ifndef NO_UNAME`
76			`(VOID ) memset((VOID ) &u, (int) 0, sizeof(struct utsname));`
77			`if (uname(&u) > -1) {`
78			`hp = gethostbyname(u.nodename);`
79			`if (hp != NULL) {`
80			`strcpy(hostname, hp->h_name);`
81			`} else {`
82			`strcpy(hostname, u.nodename);`
83			`}`
84			`hostnameInited = 1;`
85			`return hostname;`
86			`}`
87			`#else`
88			`/*`
89			`* Uname doesn't exist; try gethostname instead.`
90			`*/`
91
92			`if (gethostname(hostname, sizeof(hostname)) > -1) {`
93			`hostnameInited = 1;`
94			`return hostname;`
95			`}`
96			`#endif`
97
98			`hostname[0] = 0;`
99			`return hostname;`
100			`}`

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[/] [or1k/] [trunk/] [insight/] [tcl/] [unix/] [tclUnixSock.c] - Blame information for rev 1774