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DEFINITIONS
This source file includes following definitions.
- sys_gethostbyname
- sys_inet_makeaddr
- sys_fork
- sys_getpid
1 /*
2 Unix SMB/CIFS implementation.
3 Samba system utilities
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998-2002
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "system/network.h"
23 #include "system/filesys.h"
24
25 /*
26 The idea is that this file will eventually have wrappers around all
27 important system calls in samba. The aims are:
28
29 - to enable easier porting by putting OS dependent stuff in here
30
31 - to allow for hooks into other "pseudo-filesystems"
32
33 - to allow easier integration of things like the japanese extensions
34
35 - to support the philosophy of Samba to expose the features of
36 the OS within the SMB model. In general whatever file/printer/variable
37 expansions/etc make sense to the OS should be acceptable to Samba.
38 */
39
40 /**************************************************************************
41 A wrapper for gethostbyname() that tries avoids looking up hostnames
42 in the root domain, which can cause dial-on-demand links to come up for no
43 apparent reason.
44 ****************************************************************************/
45
46 _PUBLIC_ struct hostent *sys_gethostbyname(const char *name)
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47 {
48 #ifdef REDUCE_ROOT_DNS_LOOKUPS
49 char query[256], hostname[256];
50 char *domain;
51
52 /* Does this name have any dots in it? If so, make no change */
53
54 if (strchr(name, '.'))
55 return(gethostbyname(name));
56
57 /* Get my hostname, which should have domain name
58 attached. If not, just do the gethostname on the
59 original string.
60 */
61
62 gethostname(hostname, sizeof(hostname) - 1);
63 hostname[sizeof(hostname) - 1] = 0;
64 if ((domain = strchr(hostname, '.')) == NULL)
65 return(gethostbyname(name));
66
67 /* Attach domain name to query and do modified query.
68 If names too large, just do gethostname on the
69 original string.
70 */
71
72 if((strlen(name) + strlen(domain)) >= sizeof(query))
73 return(gethostbyname(name));
74
75 slprintf(query, sizeof(query)-1, "%s%s", name, domain);
76 return(gethostbyname(query));
77 #else /* REDUCE_ROOT_DNS_LOOKUPS */
78 return(gethostbyname(name));
79 #endif /* REDUCE_ROOT_DNS_LOOKUPS */
80 }
81
82 _PUBLIC_ struct in_addr sys_inet_makeaddr(int net, int host)
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83 {
84 struct in_addr in;
85 struct in_addr in2;
86 in = inet_makeaddr(net, host);
87 in2.s_addr = in.s_addr;
88 return in2;
89 }
90
91 /**************************************************************************
92 Wrapper for fork. Ensures we clear our pid cache.
93 ****************************************************************************/
94
95 static pid_t mypid = (pid_t)-1;
96
97 _PUBLIC_ pid_t sys_fork(void)
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98 {
99 pid_t forkret = fork();
100
101 if (forkret == (pid_t)0) {
102 /* Child - reset mypid so sys_getpid does a system call. */
103 mypid = (pid_t) -1;
104 }
105
106 return forkret;
107 }
108
109 /**************************************************************************
110 Wrapper for getpid. Ensures we only do a system call *once*.
111 ****************************************************************************/
112
113 _PUBLIC_ pid_t sys_getpid(void)
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114 {
115 if (mypid == (pid_t)-1)
116 mypid = getpid();
117
118 return mypid;
119 }