IDZEBRA  2.1.2
tstlockscope.c
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1 /* This file is part of the Zebra server.
2  Copyright (C) Index Data
3 
4 Zebra is free software; you can redistribute it and/or modify it under
5 the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2, or (at your option) any later
7 version.
8 
9 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 for more details.
13 
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 
18 */
19 
24 #if HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27 #include <assert.h>
28 #include <stdio.h>
29 #include <string.h>
30 #include <stdlib.h>
31 #include <yaz/log.h>
32 #include <yaz/test.h>
33 #include <fcntl.h>
34 #if YAZ_POSIX_THREADS
35 #include <pthread.h>
36 #endif
37 
38 int fd;
39 
40 const char *scope = "unknown";
41 
42 static int file_lock(int fd, int type, int cmd)
43 {
44  struct flock area;
45  area.l_type = type;
46  area.l_whence = SEEK_SET;
47  area.l_len = area.l_start = 0L;
48 
49  return fcntl(fd, cmd, &area);
50 }
51 
52 void *run_func(void *arg)
53 {
54  if (file_lock(fd, F_WRLCK, F_SETLK) == -1)
55  scope = "thread";
56  else
57  scope = "process";
58  return 0;
59 }
60 
61 void tst(void)
62 {
63  pthread_t child_thread;
64  int r;
65  fd = open("my.LCK", (O_CREAT|O_RDWR), 0666);
66 
67  YAZ_CHECK(fd != -1);
68  if (fd == -1)
69  {
70  yaz_log(YLOG_FATAL|YLOG_ERRNO, "open");
71  return;
72  }
73 
74  r = file_lock(fd, F_WRLCK, F_SETLKW);
75  YAZ_CHECK(r != -1);
76  if (r == -1)
77  {
78  yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcnt");
79  return;
80  }
81 
82 #if YAZ_POSIX_THREADS
83  pthread_create(&child_thread, 0 /* attr */, run_func, 0);
84  pthread_join(child_thread, 0);
85 #endif
86  yaz_log(YLOG_LOG, "fcntl lock scope: %s", scope);
87 }
88 
89 int main(int argc, char **argv)
90 {
91  YAZ_CHECK_INIT(argc, argv);
92  YAZ_CHECK_LOG();
93  tst();
94  YAZ_CHECK_TERM;
95  return 0;
96 }
97 
98 /*
99  * Local variables:
100  * c-basic-offset: 4
101  * c-file-style: "Stroustrup"
102  * indent-tabs-mode: nil
103  * End:
104  * vim: shiftwidth=4 tabstop=8 expandtab
105  */
106 
void tst(void)
Definition: tstlockscope.c:61
const char * scope
Definition: tstlockscope.c:40
static int file_lock(int fd, int type, int cmd)
Definition: tstlockscope.c:42
void * run_func(void *arg)
Definition: tstlockscope.c:52
int main(int argc, char **argv)
Definition: tstlockscope.c:89
int fd
Definition: tstlockscope.c:38