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libudev: add udev_device_new_from_devnum()

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This commit is contained in:
Kay Sievers 2008-09-21 23:28:56 -07:00
parent fb762bb928
commit 4c9dff47f6
5 changed files with 37 additions and 0 deletions
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1
udev/lib/exported_symbols
View File

@ -8,6 +8,7 @@ udev_set_log_priority
udev_get_sys_path
udev_get_dev_path
udev_device_new_from_syspath
udev_device_new_from_devnum
udev_device_get_parent
udev_device_ref
udev_device_unref

14
udev/lib/libudev-device.c
View File

@ -216,6 +216,20 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
return udev_device;
}
struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
{
char path[UTIL_PATH_SIZE];
snprintf(path, sizeof(path), "%s/dev/%s/%u:%u",
udev_get_sys_path(udev),
type == 'b' ? "block" : "char",
major(devnum), minor(devnum));
if (util_resolve_sys_link(udev, path, sizeof(path)) < 0)
return NULL;
return udev_device_new_from_syspath(udev, path);
}
static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
{
struct udev_device *udev_device_parent = NULL;

5
udev/lib/libudev-util.c
View File

@ -64,12 +64,17 @@ ssize_t util_get_sys_driver(struct udev *udev, const char *syspath, char *driver
int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
{
struct stat statbuf;
char link_target[UTIL_PATH_SIZE];
int len;
int i;
int back;
if (lstat(syspath, &statbuf) < 0)
return -1;
if (!S_ISLNK(statbuf.st_mode))
return -1;
len = readlink(syspath, link_target, sizeof(link_target));
if (len <= 0)
return -1;

1
udev/lib/libudev.h
View File

@ -46,6 +46,7 @@ extern void udev_selinux_lsetfilecon(struct udev *udev, const char *file, unsign
struct udev_device;
extern struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath);
extern struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum);
extern struct udev_device *udev_device_get_parent(struct udev_device *udev_device);
extern struct udev_device *udev_device_ref(struct udev_device *udev_device);
extern void udev_device_unref(struct udev_device *udev_device);

16
udev/lib/test-libudev.c
View File

@ -24,6 +24,7 @@
#include <string.h>
#include <getopt.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/select.h>
#include "libudev.h"
@ -114,6 +115,20 @@ static int test_device_parents(struct udev *udev, const char *syspath)
return 0;
}
static int test_device_devnum(struct udev *udev)
{
dev_t devnum = makedev(1, 3);
struct udev_device *device;
printf("looking up device: %u:%u\n", major(devnum), minor(devnum));
device = udev_device_new_from_devnum(udev, 'c', devnum);
if (device == NULL)
return -1;
print_device(device);
udev_device_unref(device);
return 0;
}
static int devices_enum_cb(struct udev_device *device, void *data)
{
printf("device: '%s' (%s) '%s'\n",
@ -253,6 +268,7 @@ int main(int argc, char *argv[], char *envp[])
}
test_device(udev, syspath);
test_device_devnum(udev);
test_device_parents(udev, syspath);
test_enumerate(udev, subsystem);
test_monitor(udev, socket);