1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/**
* Copyright © 2015, 2016 Mattias Andrée <maandree@member.fsf.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "common.h"
#include "daemonise.h"
COMMAND("satd")
USAGE("[-f]")
/**
* Create and lock the lock file, and its directory.
*
* @return A file descriptor to the lock file, -1 on error.
*/
static int
create_lock(void)
{
const char *dir;
char *path;
char *p;
pid_t pid = getpid();
int fd = -1, saved_errno = 0;
/* Create directory. */
dir = getenv("XDG_RUNTIME_DIR"), dir = (dir ? dir : "/run");
t (!(path = malloc(strlen(dir) * sizeof(char) + sizeof("/" PACKAGE "/lock"))));
p = stpcpy(stpcpy(path, dir), "/" PACKAGE);
t (mkdir(path, S_IRWXU) && (errno != EEXIST));
/* Open file. */
stpcpy(p, "/lock");
t (fd = open(path, O_RDWR | O_CREAT /* but not O_EXCL or O_TRUNC */, S_IRUSR | S_IWUSR), fd == -1);
/* Check that the daemon is not running, and mark it as running. */
if (flock(fd, LOCK_EX | LOCK_NB)) {
t (errno != EWOULDBLOCK);
fprintf(stderr, "%s: the daemon is already in reading.\n", argv0);
errno = 0;
goto fail;
}
/* Store PID in the file. */
/* Yes it is coming similar to a PID file, but this works if the started with -f. */
t (pwrite(fd, &pid, sizeof(pid), (off_t)0) < (ssize_t)sizeof(pid));
goto done;
fail:
saved_errno = errno, close(fd), fd = -1;
done:
free(path), errno = saved_errno;
return fd;
}
/**
* The sat daemon initialisation.
*
* @param argc Any value in [0, 2] is accepted.
* @param argv The name of the process, and -f if the process
* shall not be daemonised.
* @return 0 The process was successful.
* @return 1 The process failed queuing the job.
* @return 2 User error, you do not know what you are doing.
*/
int
main(int argc, char *argv[])
{
int state = -1, boot = -1, real = -1, lock = -1, foreground = 0;
char *path = NULL;
struct itimerspec spec;
/* Parse command line. */
if (argc > 0) argv0 = argv[0];
if (argc > 2) usage();
if ((argc == 2) && (!(foreground = !strcmp(argv[1], "-f"))))
usage();
/* Get hook-script pathname. */
t (set_hookpath());
/* Open/create lock file and state file. */
GET_FD(lock, LOCK_FILENO, create_lock());
GET_FD(state, STATE_FILENO, open_state(O_RDWR | O_CREAT, &path));
/* Create timers. */
GET_FD(boot, BOOT_FILENO, timerfd_create(CLOCK_BOOTTIME, 0));
GET_FD(real, REAL_FILENO, timerfd_create(CLOCK_REALTIME, 0));
/* Configure timers. */
memset(&spec, 0, sizeof(spec));
t (timerfd_settime(boot, TFD_TIMER_ABSTIME, &spec, NULL));
t (timerfd_settime(real, TFD_TIMER_ABSTIME, &spec, NULL));
/* Daemonise. */
t (foreground ? 0 : daemonise("satd", /*DAEMONISE_KEEP_FDS | DAEMONISE_NEW_PID,*/ 3, 4, 5, 6, -1));
/* Change to a process image without all this initialisation text. */
execl(LIBEXECDIR "/" PACKAGE "/satd-diminished", argv0, path, NULL);
fail:
if (errno)
perror(argv0);
free(path);
close(state), close(boot), close(real), close(lock);
undaemonise();
return 1;
}
|
