blob: de6b9a9ea95130fa70f8b563aeca16fad99f2de0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* 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 1.2.4.1 1999/03/04 01:01:00 stanton 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;
}
/*
*----------------------------------------------------------------------
*
* TclHasSockets --
*
* Detect if sockets are available on this platform.
*
* Results:
* Returns TCL_OK.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclHasSockets(interp)
Tcl_Interp *interp; /* Not used. */
{
return TCL_OK;
}
|
