summaryrefslogtreecommitdiff
path: root/src/udev/libudev-queue.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/udev/libudev-queue.c')
-rw-r--r--src/udev/libudev-queue.c466
1 files changed, 0 insertions, 466 deletions
diff --git a/src/udev/libudev-queue.c b/src/udev/libudev-queue.c
deleted file mode 100644
index 72408d0166..0000000000
--- a/src/udev/libudev-queue.c
+++ /dev/null
@@ -1,466 +0,0 @@
-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
- * Copyright (C) 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <dirent.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <sys/stat.h>
-
-#include "libudev.h"
-#include "libudev-private.h"
-
-/**
- * SECTION:libudev-queue
- * @short_description: access to currently active events
- *
- * The udev daemon processes events asynchronously. All events which do not have
- * interdependencies run in parallel. This exports the current state of the
- * event processing queue, and the current event sequence numbers from the kernel
- * and the udev daemon.
- */
-
-/**
- * udev_queue:
- *
- * Opaque object representing the current event queue in the udev daemon.
- */
-struct udev_queue {
- struct udev *udev;
- int refcount;
- struct udev_list queue_list;
-};
-
-/**
- * udev_queue_new:
- * @udev: udev library context
- *
- * The initial refcount is 1, and needs to be decremented to
- * release the resources of the udev queue context.
- *
- * Returns: the udev queue context, or #NULL on error.
- **/
-_public_ struct udev_queue *udev_queue_new(struct udev *udev)
-{
- struct udev_queue *udev_queue;
-
- if (udev == NULL)
- return NULL;
-
- udev_queue = calloc(1, sizeof(struct udev_queue));
- if (udev_queue == NULL)
- return NULL;
- udev_queue->refcount = 1;
- udev_queue->udev = udev;
- udev_list_init(udev, &udev_queue->queue_list, false);
- return udev_queue;
-}
-
-/**
- * udev_queue_ref:
- * @udev_queue: udev queue context
- *
- * Take a reference of a udev queue context.
- *
- * Returns: the same udev queue context.
- **/
-_public_ struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
-{
- if (udev_queue == NULL)
- return NULL;
- udev_queue->refcount++;
- return udev_queue;
-}
-
-/**
- * udev_queue_unref:
- * @udev_queue: udev queue context
- *
- * Drop a reference of a udev queue context. If the refcount reaches zero,
- * the resources of the queue context will be released.
- **/
-_public_ void udev_queue_unref(struct udev_queue *udev_queue)
-{
- if (udev_queue == NULL)
- return;
- udev_queue->refcount--;
- if (udev_queue->refcount > 0)
- return;
- udev_list_cleanup(&udev_queue->queue_list);
- free(udev_queue);
-}
-
-/**
- * udev_queue_get_udev:
- * @udev_queue: udev queue context
- *
- * Retrieve the udev library context the queue context was created with.
- *
- * Returns: the udev library context.
- **/
-_public_ struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
-{
- if (udev_queue == NULL)
- return NULL;
- return udev_queue->udev;
-}
-
-unsigned long long int udev_get_kernel_seqnum(struct udev *udev)
-{
- char filename[UTIL_PATH_SIZE];
- unsigned long long int seqnum;
- int fd;
- char buf[32];
- ssize_t len;
-
- util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), "/kernel/uevent_seqnum", NULL);
- fd = open(filename, O_RDONLY|O_CLOEXEC);
- if (fd < 0)
- return 0;
- len = read(fd, buf, sizeof(buf));
- close(fd);
- if (len <= 2)
- return 0;
- buf[len-1] = '\0';
- seqnum = strtoull(buf, NULL, 10);
- return seqnum;
-}
-
-/**
- * udev_queue_get_kernel_seqnum:
- * @udev_queue: udev queue context
- *
- * Returns: the current kernel event sequence number.
- **/
-_public_ unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
-{
- unsigned long long int seqnum;
-
- if (udev_queue == NULL)
- return -EINVAL;
-
- seqnum = udev_get_kernel_seqnum(udev_queue->udev);
- return seqnum;
-}
-
-int udev_queue_read_seqnum(FILE *queue_file, unsigned long long int *seqnum)
-{
- if (fread(seqnum, sizeof(unsigned long long int), 1, queue_file) != 1)
- return -1;
-
- return 0;
-}
-
-ssize_t udev_queue_skip_devpath(FILE *queue_file)
-{
- unsigned short int len;
-
- if (fread(&len, sizeof(unsigned short int), 1, queue_file) == 1) {
- char *devpath = alloca(len);
-
- /* use fread to skip, fseek might drop buffered data */
- if (fread(devpath, 1, len, queue_file) == len)
- return len;
- }
-
- return -1;
-}
-
-ssize_t udev_queue_read_devpath(FILE *queue_file, char *devpath, size_t size)
-{
- unsigned short int read_bytes = 0;
- unsigned short int len;
-
- if (fread(&len, sizeof(unsigned short int), 1, queue_file) != 1)
- return -1;
-
- read_bytes = (len < size - 1) ? len : size - 1;
- if (fread(devpath, 1, read_bytes, queue_file) != read_bytes)
- return -1;
- devpath[read_bytes] = '\0';
-
- /* if devpath was too long, skip unread characters */
- if (read_bytes != len) {
- unsigned short int skip_bytes = len - read_bytes;
- char *buf = alloca(skip_bytes);
-
- if (fread(buf, 1, skip_bytes, queue_file) != skip_bytes)
- return -1;
- }
-
- return read_bytes;
-}
-
-static FILE *open_queue_file(struct udev_queue *udev_queue, unsigned long long int *seqnum_start)
-{
- char filename[UTIL_PATH_SIZE];
- FILE *queue_file;
-
- util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_queue->udev), "/queue.bin", NULL);
- queue_file = fopen(filename, "re");
- if (queue_file == NULL)
- return NULL;
-
- if (udev_queue_read_seqnum(queue_file, seqnum_start) < 0) {
- err(udev_queue->udev, "corrupt queue file\n");
- fclose(queue_file);
- return NULL;
- }
-
- return queue_file;
-}
-
-/**
- * udev_queue_get_udev_seqnum:
- * @udev_queue: udev queue context
- *
- * Returns: the last known udev event sequence number.
- **/
-_public_ unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
-{
- unsigned long long int seqnum_udev;
- FILE *queue_file;
-
- queue_file = open_queue_file(udev_queue, &seqnum_udev);
- if (queue_file == NULL)
- return 0;
-
- for (;;) {
- unsigned long long int seqnum;
- ssize_t devpath_len;
-
- if (udev_queue_read_seqnum(queue_file, &seqnum) < 0)
- break;
- devpath_len = udev_queue_skip_devpath(queue_file);
- if (devpath_len < 0)
- break;
- if (devpath_len > 0)
- seqnum_udev = seqnum;
- }
-
- fclose(queue_file);
- return seqnum_udev;
-}
-
-/**
- * udev_queue_get_udev_is_active:
- * @udev_queue: udev queue context
- *
- * Returns: a flag indicating if udev is active.
- **/
-_public_ int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
-{
- unsigned long long int seqnum_start;
- FILE *queue_file;
-
- queue_file = open_queue_file(udev_queue, &seqnum_start);
- if (queue_file == NULL)
- return 0;
-
- fclose(queue_file);
- return 1;
-}
-
-/**
- * udev_queue_get_queue_is_empty:
- * @udev_queue: udev queue context
- *
- * Returns: a flag indicating if udev is currently handling events.
- **/
-_public_ int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
-{
- unsigned long long int seqnum_kernel;
- unsigned long long int seqnum_udev = 0;
- int queued = 0;
- int is_empty = 0;
- FILE *queue_file;
-
- if (udev_queue == NULL)
- return -EINVAL;
- queue_file = open_queue_file(udev_queue, &seqnum_udev);
- if (queue_file == NULL)
- return 1;
-
- for (;;) {
- unsigned long long int seqnum;
- ssize_t devpath_len;
-
- if (udev_queue_read_seqnum(queue_file, &seqnum) < 0)
- break;
- devpath_len = udev_queue_skip_devpath(queue_file);
- if (devpath_len < 0)
- break;
-
- if (devpath_len > 0) {
- queued++;
- seqnum_udev = seqnum;
- } else {
- queued--;
- }
- }
-
- if (queued > 0)
- goto out;
-
- seqnum_kernel = udev_queue_get_kernel_seqnum(udev_queue);
- if (seqnum_udev < seqnum_kernel)
- goto out;
-
- is_empty = 1;
-
-out:
- fclose(queue_file);
- return is_empty;
-}
-
-/**
- * udev_queue_get_seqnum_sequence_is_finished:
- * @udev_queue: udev queue context
- * @start: first event sequence number
- * @end: last event sequence number
- *
- * Returns: a flag indicating if any of the sequence numbers in the given range is currently active.
- **/
-_public_ int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
- unsigned long long int start, unsigned long long int end)
-{
- unsigned long long int seqnum;
- ssize_t devpath_len;
- int unfinished;
- FILE *queue_file;
-
- if (udev_queue == NULL)
- return -EINVAL;
- queue_file = open_queue_file(udev_queue, &seqnum);
- if (queue_file == NULL)
- return 1;
- if (start < seqnum)
- start = seqnum;
- if (start > end) {
- fclose(queue_file);
- return 1;
- }
- if (end - start > INT_MAX - 1) {
- fclose(queue_file);
- return -EOVERFLOW;
- }
-
- /*
- * we might start with 0, and handle the initial seqnum
- * only when we find an entry in the queue file
- **/
- unfinished = end - start;
-
- do {
- if (udev_queue_read_seqnum(queue_file, &seqnum) < 0)
- break;
- devpath_len = udev_queue_skip_devpath(queue_file);
- if (devpath_len < 0)
- break;
-
- /*
- * we might start with an empty or re-build queue file, where
- * the initial seqnum is not recorded as finished
- */
- if (start == seqnum && devpath_len > 0)
- unfinished++;
-
- if (devpath_len == 0) {
- if (seqnum >= start && seqnum <= end)
- unfinished--;
- }
- } while (unfinished > 0);
-
- fclose(queue_file);
-
- return (unfinished == 0);
-}
-
-/**
- * udev_queue_get_seqnum_is_finished:
- * @udev_queue: udev queue context
- * @seqnum: sequence number
- *
- * Returns: a flag indicating if the given sequence number is currently active.
- **/
-_public_ int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
-{
- if (!udev_queue_get_seqnum_sequence_is_finished(udev_queue, seqnum, seqnum))
- return 0;
-
- return 1;
-}
-
-/**
- * udev_queue_get_queued_list_entry:
- * @udev_queue: udev queue context
- *
- * Returns: the first entry of the list of queued events.
- **/
-_public_ struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
-{
- unsigned long long int seqnum;
- FILE *queue_file;
-
- if (udev_queue == NULL)
- return NULL;
- udev_list_cleanup(&udev_queue->queue_list);
-
- queue_file = open_queue_file(udev_queue, &seqnum);
- if (queue_file == NULL)
- return NULL;
-
- for (;;) {
- char syspath[UTIL_PATH_SIZE];
- char *s;
- size_t l;
- ssize_t len;
- char seqnum_str[32];
- struct udev_list_entry *list_entry;
-
- if (udev_queue_read_seqnum(queue_file, &seqnum) < 0)
- break;
- snprintf(seqnum_str, sizeof(seqnum_str), "%llu", seqnum);
-
- s = syspath;
- l = util_strpcpyl(&s, sizeof(syspath), udev_get_sys_path(udev_queue->udev), NULL);
- len = udev_queue_read_devpath(queue_file, s, l);
- if (len < 0)
- break;
-
- if (len > 0) {
- udev_list_entry_add(&udev_queue->queue_list, syspath, seqnum_str);
- } else {
- udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_queue->queue_list)) {
- if (strcmp(seqnum_str, udev_list_entry_get_value(list_entry)) == 0) {
- udev_list_entry_delete(list_entry);
- break;
- }
- }
- }
- }
- fclose(queue_file);
-
- return udev_list_get_entry(&udev_queue->queue_list);
-}
-
-struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue);
-_public_ struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue)
-{
- errno = ENOSYS;
- return NULL;
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-17 12:49:15 +0000