1 /*-
2 * Copyright (c) 2003-2005 MAEKAWA Masahide <maekawa@cvsync.org>
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
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/types.h>
31 #include <sys/stat.h>
32
33 #include <stdio.h>
34 #include <stdlib.h>
35
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <limits.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #include "compat_stdbool.h"
43 #include "compat_stdio.h"
44 #include "compat_stdlib.h"
45 #include "compat_limits.h"
46
47 #include "logmsg.h"
48 #include "pid.h"
49
50 static char cvsync_pidfile[PATH_MAX + CVSYNC_NAME_MAX + 1];
51
52 char *
pid_create(const char * pidfile)53 pid_create(const char *pidfile)
54 {
55 char pid[64];
56 ssize_t len;
57 int fd, wn;
58
59 cvsync_pidfile[0] = '\0';
60
61 if (pidfile == NULL)
62 return (cvsync_pidfile);
63
64 if (pidfile[0] != '/') {
65 if (realpath(pidfile, cvsync_pidfile) == NULL) {
66 logmsg_err("%s: %s", pidfile, strerror(errno));
67 return (NULL);
68 }
69 } else {
70 wn = snprintf(cvsync_pidfile, sizeof(cvsync_pidfile), "%s",
71 pidfile);
72 if ((wn <= 0) || ((size_t)wn >= sizeof(cvsync_pidfile)))
73 return (NULL);
74 }
75
76 if ((fd = open(cvsync_pidfile, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC,
77 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0) {
78 if (errno == EEXIST)
79 logmsg_err("Another cvsync process is running?");
80 else
81 logmsg_err("%s: %s", cvsync_pidfile, strerror(errno));
82 cvsync_pidfile[0] = '\0';
83 return (NULL);
84 }
85 wn = snprintf(pid, sizeof(pid), "%d\n", (signed)getpid());
86 if ((wn <= 0) || ((size_t)wn >= sizeof(pid))) {
87 (void)unlink(cvsync_pidfile);
88 cvsync_pidfile[0] = '\0';
89 return (NULL);
90 }
91 if ((len = write(fd, pid, (size_t)wn)) == -1) {
92 (void)unlink(cvsync_pidfile);
93 cvsync_pidfile[0] = '\0';
94 return (NULL);
95 }
96 if (len != (ssize_t)wn) {
97 (void)unlink(cvsync_pidfile);
98 cvsync_pidfile[0] = '\0';
99 return (NULL);
100 }
101 if (close(fd) == -1) {
102 logmsg_err("%s: %s", cvsync_pidfile, strerror(errno));
103 (void)unlink(cvsync_pidfile);
104 cvsync_pidfile[0] = '\0';
105 return (NULL);
106 }
107
108 return (cvsync_pidfile);
109 }
110
111 bool
pid_remove(void)112 pid_remove(void)
113 {
114 char pid[64], *ep;
115 ssize_t rn;
116 long npid;
117 int fd;
118
119 if (strlen(cvsync_pidfile) == 0)
120 return (true);
121
122 if ((fd = open(cvsync_pidfile, O_RDONLY, 0)) == -1) {
123 if (errno == ENOENT)
124 return (true);
125 logmsg_err("%s: %s", cvsync_pidfile, strerror(errno));
126 return (false);
127 }
128 if ((rn = read(fd, pid, sizeof(pid) - 1)) == -1) {
129 logmsg_err("%s: %s", cvsync_pidfile, strerror(errno));
130 (void)close(fd);
131 return (false);
132 }
133 pid[rn] = '\0';
134 errno = 0;
135 npid = strtol(pid, &ep, 10);
136 if ((ep == NULL) || (*ep != '\n') ||
137 ((npid == 0) && (errno == EINVAL)) ||
138 (((npid == LONG_MIN) || (npid == LONG_MAX)) &&
139 (errno == ERANGE))) {
140 logmsg_err("%s: %s: %s", cvsync_pidfile, pid,
141 strerror(EINVAL));
142 (void)close(fd);
143 return (false);
144 }
145 if (close(fd) == -1) {
146 logmsg_err("%s: %s", cvsync_pidfile, strerror(errno));
147 return (false);
148 }
149 if ((pid_t)npid != getpid())
150 return (false);
151
152 if (unlink(cvsync_pidfile) == -1) {
153 logmsg_err("%s: %s", cvsync_pidfile, strerror(errno));
154 return (false);
155 }
156
157 return (true);
158 }
159