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libudev: get devnum from uevent file

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This commit is contained in:
Kay Sievers 2008-09-25 14:26:22 -07:00
parent bf7ad0ea66
commit 04f5d75f0c
3 changed files with 19 additions and 12 deletions
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2
TODO
View File

@ -1,6 +1,6 @@
o enumerate() - add buses and drivers
o increase ressize buffer
o set dev_t from "uevent" MAJOR/MINOR
o lazy loading of "uevent" and db
o add DVB variables to kernel, and drop shell script rule
o add watershed extra

26
udev/lib/libudev-device.c
View File

@ -70,6 +70,8 @@ static int device_read_uevent_file(struct udev_device *udev_device)
char filename[UTIL_PATH_SIZE];
FILE *f;
char line[UTIL_LINE_SIZE];
int maj = 0;
int min = 0;
util_strlcpy(filename, udev_device->syspath, sizeof(filename));
util_strlcat(filename, "/uevent", sizeof(filename));
@ -84,9 +86,17 @@ static int device_read_uevent_file(struct udev_device *udev_device)
if (pos == NULL)
continue;
pos[0] = '\0';
if (strncmp(line, "MAJOR=", 6) == 0)
maj = strtoull(&line[6], NULL, 10);
else if (strncmp(line, "MINOR=", 6) == 0)
min = strtoull(&line[6], NULL, 10);
device_add_property_from_string(udev_device, line);
}
udev_device->devnum = makedev(maj, min);
fclose(f);
return 0;
}
@ -97,7 +107,6 @@ static int device_read_db(struct udev_device *udev_device)
char filename[UTIL_PATH_SIZE];
char line[UTIL_LINE_SIZE];
FILE *f;
int rc = 0;
syspath_to_db_path(udev_device, filename, sizeof(filename));
@ -131,7 +140,6 @@ static int device_read_db(struct udev_device *udev_device)
while (fgets(line, sizeof(line), f)) {
ssize_t len;
const char *val;
unsigned int maj, min;
len = strlen(line);
if (len < 4)
@ -143,10 +151,6 @@ static int device_read_db(struct udev_device *udev_device)
case 'N':
asprintf(&udev_device->devname, "%s/%s", udev_get_dev_path(udev_device->udev), val);
break;
case 'M':
sscanf(val, "%u:%u", &maj, &min);
device_set_devnum(udev_device, makedev(maj, min));
break;
case 'S':
util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
@ -157,7 +161,7 @@ static int device_read_db(struct udev_device *udev_device)
device_set_devlink_priority(udev_device, atoi(val));
break;
case 'T':
device_set_timeout(udev_device, atoi(val));
device_set_timeout(udev_device, atoi(val));
break;
case 'A':
device_set_num_fake_partitions(udev_device, atoi(val));
@ -172,7 +176,8 @@ static int device_read_db(struct udev_device *udev_device)
}
fclose(f);
return rc;
info(udev_device->udev, "device %p filled with udev database data\n", udev_device);
return 0;
}
struct udev_device *device_init(struct udev *udev)
@ -238,8 +243,7 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
device_read_uevent_file(udev_device);
if (device_read_db(udev_device) >= 0)
info(udev, "device %p filled with udev database data\n", udev_device);
device_read_db(udev_device);
return udev_device;
}
@ -264,7 +268,7 @@ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, de
if (util_resolve_sys_link(udev, path, sizeof(path)) == 0)
return udev_device_new_from_syspath(udev, path);
/* search all sys devices for the major/minor */
/* fallback to search all sys devices for the major/minor */
enumerate = udev_enumerate_new_from_subsystems(udev, NULL);
if (enumerate == NULL)
return NULL;

3
udev/lib/test-libudev.c
View File

@ -40,6 +40,7 @@ static void log_fn(struct udev *udev,
static void print_device(struct udev_device *device)
{
const char *str;
dev_t devnum;
int count;
struct udev_list *list;
@ -56,6 +57,8 @@ static void print_device(struct udev_device *device)
printf("driver: '%s'\n", str);
str = udev_device_get_devnode(device);
printf("devname: '%s'\n", str);
devnum = udev_device_get_devnum(device);
printf("devnum: %u:%u\n", major(devnum), minor(devnum));
count = 0;
list = udev_device_get_devlinks_list(device);