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git.ipfire.org Git - thirdparty/systemd.git/blob - src/udev/collect/collect.c
2 * Collect variables across events.
4 * usage: collect [--add|--remove] <checkpoint> <id> <idlist>
6 * Adds ID <id> to the list governed by <checkpoint>.
7 * <id> must be part of the ID list <idlist>.
8 * If all IDs given by <idlist> are listed (ie collect has been
9 * invoked for each ID in <idlist>) collect returns 0, the
10 * number of missing IDs otherwise.
11 * A negative number is returned on error.
13 * Copyright(C) 2007, Hannes Reinecke <hare@suse.de>
15 * This program is free software: you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation, either version 2 of the License, or
18 * (at your option) any later version.
31 #include <sys/types.h>
35 #include "libudev-private.h"
39 #define UDEV_ALARM_TIMEOUT 180
48 struct udev_list_node node
;
50 enum collect_state state
;
53 static struct udev_list_node bunch
;
56 /* This can increase dynamically */
57 static size_t bufsize
= BUFSIZE
;
59 static inline struct _mate
*node_to_mate(struct udev_list_node
*node
)
61 return container_of(node
, struct _mate
, node
);
64 _noreturn_
static void sig_alrm(int signo
)
69 static void usage(void)
71 printf("usage: collect [--add|--remove] [--debug] <checkpoint> <id> <idlist>\n"
73 " Adds ID <id> to the list governed by <checkpoint>.\n"
74 " <id> must be part of the list <idlist>.\n"
75 " If all IDs given by <idlist> are listed (ie collect has been\n"
76 " invoked for each ID in <idlist>) collect returns 0, the\n"
77 " number of missing IDs otherwise.\n"
78 " On error a negative number is returned.\n"
85 * Prepares the database file
87 static int prepare(char *dir
, char *filename
)
93 if (stat(dir
, &statbuf
) < 0)
96 snprintf(buf
, sizeof(buf
), "%s/%s", dir
, filename
);
98 fd
= open(buf
,O_RDWR
|O_CREAT
, S_IRUSR
|S_IWUSR
);
100 fprintf(stderr
, "Cannot open %s: %m\n", buf
);
102 if (lockf(fd
,F_TLOCK
,0) < 0) {
104 fprintf(stderr
, "Lock taken, wait for %d seconds\n", UDEV_ALARM_TIMEOUT
);
105 if (errno
== EAGAIN
|| errno
== EACCES
) {
106 alarm(UDEV_ALARM_TIMEOUT
);
107 lockf(fd
, F_LOCK
, 0);
109 fprintf(stderr
, "Acquired lock on %s\n", buf
);
112 fprintf(stderr
, "Could not get lock on %s: %m\n", buf
);
120 * Read checkpoint file
122 * Tricky reading this. We allocate a buffer twice as large
123 * as we're going to read. Then we read into the upper half
124 * of that buffer and start parsing.
125 * Once we do _not_ find end-of-work terminator (whitespace
126 * character) we move the upper half to the lower half,
127 * adjust the read pointer and read the next bit.
128 * Quite clever methinks :-)
129 * I should become a programmer ...
131 * Yes, one could have used fgets() for this. But then we'd
132 * have to use freopen etc which I found quite tedious.
134 static int checkout(int fd
)
137 char *buf
, *ptr
, *word
= NULL
;
142 buf
= malloc(bufsize
+ 1);
145 memset(buf
, ' ', bufsize
);
149 while ((read(fd
, buf
+ len
, len
)) > 0) {
150 while (ptr
&& *ptr
) {
152 ptr
= strpbrk(word
," \n\t\r");
153 if (!ptr
&& word
< (buf
+ len
)) {
154 bufsize
= bufsize
<< 1;
156 fprintf(stderr
, "ID overflow, restarting with size %zi\n", bufsize
);
158 lseek(fd
, 0, SEEK_SET
);
168 fprintf(stderr
, "Found word %s\n", word
);
169 him
= malloc(sizeof (struct _mate
));
174 him
->name
= strdup(word
);
180 him
->state
= STATE_OLD
;
181 udev_list_node_append(&him
->node
, &bunch
);
185 memcpy(buf
, buf
+ len
, len
);
186 memset(buf
+ len
, ' ', len
);
202 * Adds a new ID 'us' to the internal list,
203 * marks it as confirmed.
205 static void invite(char *us
)
207 struct udev_list_node
*him_node
;
208 struct _mate
*who
= NULL
;
211 fprintf(stderr
, "Adding ID '%s'\n", us
);
213 udev_list_node_foreach(him_node
, &bunch
) {
214 struct _mate
*him
= node_to_mate(him_node
);
216 if (streq(him
->name
, us
)) {
217 him
->state
= STATE_CONFIRMED
;
222 fprintf(stderr
, "ID '%s' not in database\n", us
);
229 * Marks the ID 'us' as invalid,
230 * causing it to be removed when the
231 * list is written out.
233 static void reject(char *us
)
235 struct udev_list_node
*him_node
;
236 struct _mate
*who
= NULL
;
239 fprintf(stderr
, "Removing ID '%s'\n", us
);
241 udev_list_node_foreach(him_node
, &bunch
) {
242 struct _mate
*him
= node_to_mate(him_node
);
244 if (streq(him
->name
, us
)) {
245 him
->state
= STATE_NONE
;
250 fprintf(stderr
, "ID '%s' not in database\n", us
);
256 * Remove all IDs in the internal list which are not part
257 * of the list passed via the commandline.
259 static void kickout(void)
261 struct udev_list_node
*him_node
;
262 struct udev_list_node
*tmp
;
264 udev_list_node_foreach_safe(him_node
, tmp
, &bunch
) {
265 struct _mate
*him
= node_to_mate(him_node
);
267 if (him
->state
== STATE_OLD
) {
268 udev_list_node_remove(&him
->node
);
278 * Counts all missing IDs in the internal list.
280 static int missing(int fd
)
284 struct udev_list_node
*him_node
;
286 buf
= malloc(bufsize
);
290 udev_list_node_foreach(him_node
, &bunch
) {
291 struct _mate
*him
= node_to_mate(him_node
);
293 if (him
->state
== STATE_NONE
) {
296 while (strlen(him
->name
)+1 >= bufsize
) {
299 bufsize
= bufsize
<< 1;
300 tmpbuf
= realloc(buf
, bufsize
);
307 snprintf(buf
, strlen(him
->name
)+2, "%s ", him
->name
);
308 if (write(fd
, buf
, strlen(buf
)) < 0) {
322 * Prints out the status of the internal list.
324 static void everybody(void)
326 struct udev_list_node
*him_node
;
327 const char *state
= "";
329 udev_list_node_foreach(him_node
, &bunch
) {
330 struct _mate
*him
= node_to_mate(him_node
);
332 switch (him
->state
) {
339 case STATE_CONFIRMED
:
343 fprintf(stderr
, "ID: %s=%s\n", him
->name
, state
);
347 int main(int argc
, char **argv
)
350 static const struct option options
[] = {
351 { "add", no_argument
, NULL
, 'a' },
352 { "remove", no_argument
, NULL
, 'r' },
353 { "debug", no_argument
, NULL
, 'd' },
354 { "help", no_argument
, NULL
, 'h' },
358 char *checkpoint
, *us
;
361 int ret
= EXIT_SUCCESS
;
363 char tmpdir
[UTIL_PATH_SIZE
];
374 option
= getopt_long(argc
, argv
, "ardh", options
, NULL
);
398 if (argi
+ 2 > argc
) {
399 printf("Missing parameter(s)\n");
403 checkpoint
= argv
[argi
++];
406 if (signal(SIGALRM
, sig_alrm
) == SIG_ERR
) {
407 fprintf(stderr
, "Cannot set SIGALRM: %m\n");
412 udev_list_node_init(&bunch
);
415 fprintf(stderr
, "Using checkpoint '%s'\n", checkpoint
);
417 strscpyl(tmpdir
, sizeof(tmpdir
), "/run/udev/collect", NULL
);
418 fd
= prepare(tmpdir
, checkpoint
);
424 if (checkout(fd
) < 0) {
429 for (i
= argi
; i
< argc
; i
++) {
430 struct udev_list_node
*him_node
;
434 udev_list_node_foreach(him_node
, &bunch
) {
435 struct _mate
*him
= node_to_mate(him_node
);
437 if (streq(him
->name
, argv
[i
]))
444 fprintf(stderr
, "ID %s: not in database\n", argv
[i
]);
445 him
= new(struct _mate
, 1);
451 him
->name
= strdup(argv
[i
]);
458 him
->state
= STATE_NONE
;
459 udev_list_node_append(&him
->node
, &bunch
);
462 fprintf(stderr
, "ID %s: found in database\n", argv
[i
]);
463 who
->state
= STATE_CONFIRMED
;
474 fprintf(stderr
, "Prune lists\n");
478 lseek(fd
, 0, SEEK_SET
);
482 lockf(fd
, F_ULOCK
, 0);
488 printf("COLLECT_%s=%d\n", checkpoint
, ret
);