2 Unix SMB/Netbios implementation.
4 SMB wrapper functions - shared variables
5 Copyright (C) Andrew Tridgell 1998
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 2 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 static char *variables
;
26 static int shared_size
;
28 /*****************************************************
30 *******************************************************/
31 void smbw_setup_shared(void)
36 slprintf(name
,sizeof(name
)-1, "%s/smbw.XXXXXX",tmpdir());
38 fd
= smb_mkstemp(name
);
40 if (fd
== -1) goto failed
;
44 shared_fd
= set_maxfiles(SMBW_MAX_OPEN
);
46 while (shared_fd
&& dup2(fd
, shared_fd
) != shared_fd
) shared_fd
--;
48 if (shared_fd
== 0) goto failed
;
52 DEBUG(4,("created shared_fd=%d\n", shared_fd
));
54 slprintf(s
,sizeof(s
)-1,"%d", shared_fd
);
56 smbw_setenv("SMBW_HANDLE", s
);
61 perror("Failed to setup shared variable area ");
67 /*****************************************************
68 lock the shared variable area
69 *******************************************************/
70 static void lockit(void)
73 char *p
= getenv("SMBW_HANDLE");
75 DEBUG(0,("ERROR: can't get smbw shared handle\n"));
81 fcntl_lock(shared_fd
,SMB_F_SETLKW
,0,1,F_WRLCK
)==False
) {
82 DEBUG(0,("ERROR: can't get smbw shared lock (%s)\n", strerror(errno
)));
88 /*****************************************************
89 unlock the shared variable area
90 *******************************************************/
91 static void unlockit(void)
95 fcntl_lock(shared_fd
,SMB_F_SETLK
,0,1,F_UNLCK
);
100 /*****************************************************
101 get a variable from the shared area
102 *******************************************************/
103 char *smbw_getshared(const char *name
)
110 /* maybe the area has changed */
111 if (fstat(shared_fd
, &st
)) goto failed
;
113 if (st
.st_size
!= shared_size
) {
114 variables
= (char *)Realloc(variables
, st
.st_size
);
115 if (!variables
) goto failed
;
116 shared_size
= st
.st_size
;
117 lseek(shared_fd
, 0, SEEK_SET
);
118 if (read(shared_fd
, variables
, shared_size
) != shared_size
) {
126 while (i
< shared_size
) {
130 l1
= SVAL(&variables
[i
], 0);
131 l2
= SVAL(&variables
[i
], 2);
134 v
= &variables
[i
+4+l1
];
137 if (strcmp(name
,n
)) {
146 DEBUG(0,("smbw: shared variables corrupt (%s)\n", strerror(errno
)));
153 /*****************************************************
154 set a variable in the shared area
155 *******************************************************/
156 void smbw_setshared(const char *name
, const char *val
)
160 /* we don't allow variable overwrite */
161 if (smbw_getshared(name
)) return;
168 variables
= (char *)Realloc(variables
, shared_size
+ l1
+l2
+4);
171 DEBUG(0,("out of memory in smbw_setshared\n"));
175 SSVAL(&variables
[shared_size
], 0, l1
);
176 SSVAL(&variables
[shared_size
], 2, l2
);
178 pstrcpy(&variables
[shared_size
] + 4, name
);
179 pstrcpy(&variables
[shared_size
] + 4 + l1
, val
);
181 shared_size
+= l1
+l2
+4;
183 lseek(shared_fd
, 0, SEEK_SET
);
184 if (write(shared_fd
, variables
, shared_size
) != shared_size
) {
185 DEBUG(0,("smbw_setshared failed (%s)\n", strerror(errno
)));
193 /*****************************************************************
194 set an env variable - some systems don't have this
195 *****************************************************************/
196 int smbw_setenv(const char *name
, const char *value
)
202 slprintf(s
,sizeof(s
)-1,"%s=%s", name
, value
);
206 if (p
) ret
= putenv(p
);
211 /*****************************************************************
212 return true if the passed fd is the SMBW_HANDLE
213 *****************************************************************/
214 int smbw_shared_fd(int fd
)
216 return (shared_fd
&& shared_fd
== fd
);