root/src/utils/noit_lockfile.c

Revision 8c8aea6bc50ed2cc0619d0585a079dc9a4de6a16, 2.5 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 5 years ago)

lockfile as root node attribute in both noit.conf and stratcon.conf, closes #263

  • Property mode set to 100644
Line 
1 /*
2  * Copyright (c) 2010, OmniTI Computer Consulting, Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  *    * Redistributions of source code must retain the above copyright
10  *      notice, this list of conditions and the following disclaimer.
11  *    * Redistributions in binary form must reproduce the above
12  *      copyright notice, this list of conditions and the following
13  *      disclaimer in the documentation and/or other materials provided
14  *      with the distribution.
15  *    * Neither the name OmniTI Computer Consulting, Inc. nor the names
16  *      of its contributors may be used to endorse or promote products
17  *      derived from this software without specific prior written
18  *      permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 #include "noit_config.h"
34 #include "utils/noit_lockfile.h"
35 #include <unistd.h>
36 #include <fcntl.h>
37 #include <errno.h>
38
39 noit_lockfile_t
40 noit_lockfile_acquire(const char *fp) {
41   noit_lockfile_t fd;
42   struct flock fl;
43   int frv;
44
45   fd = open(fp, O_RDWR|O_CREAT, 0600);
46   if(fd < 0) return -1;
47
48   memset(&fl, 0, sizeof(fl));
49   fl.l_type = F_WRLCK;
50   fl.l_whence = SEEK_SET;
51   fl.l_start = 0;
52   fl.l_len = 0;
53
54   while ((frv = fcntl(fd, F_SETLK, &fl)) == -1 && errno == EINTR);
55   if(frv < 0) {
56     close(fd);
57     return -1;
58   }
59   return fd;
60 }
61
62 int
63 noit_lockfile_release(noit_lockfile_t fd) {
64   int frv;
65   struct flock fl;
66   if(fd < 0) return -1;
67  
68   memset(&fl, 0, sizeof(fl));
69   fl.l_type = F_UNLCK;
70   fl.l_whence = SEEK_SET;
71   fl.l_start = 0;
72   fl.l_len = 0;
73
74   while ((frv = fcntl(fd, F_SETLK, &fl)) == -1 && errno == EINTR);
75   close(fd);
76   if(frv < 0) return -1;
77   return 0;
78 }
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