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udevd: at startup create /dev/null, /dev/console, /dev/kmsg

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This commit is contained in:
Kay Sievers 2009-04-19 03:25:04 +02:00
parent ccc87b0e99
commit 540f46698d
3 changed files with 35 additions and 3 deletions
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2
udev/lib/libudev-ctrl.c
View File

@ -22,7 +22,7 @@
#include "libudev.h"
#include "libudev-private.h"
/* last known version with this wire protocol */
/* wire protocol magic must match */
#define UDEV_CTRL_MAGIC 0xdead1dea
enum udev_ctrl_msg_type {

12
udev/udev-node.c
View File

@ -68,7 +68,7 @@ static int name_index(struct udev *udev, const char *devpath, const char *name,
int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mode_t mode, uid_t uid, gid_t gid)
{
struct udev *udev = udev_device_get_udev(dev);
char file_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
char filename[UTIL_PATH_SIZE];
struct stat stats;
int preserve = 0;
int err = 0;
@ -81,8 +81,14 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
else
mode |= S_IFCHR;
if (file == NULL)
if (file == NULL) {
file = udev_device_get_devnode(dev);
} else if (file[0] != '/') {
util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, file, sizeof(filename));
file = filename;
}
if (lstat(file, &stats) == 0) {
if (((stats.st_mode & S_IFMT) == (mode & S_IFMT)) && (stats.st_rdev == devnum)) {
@ -90,6 +96,8 @@ int udev_node_mknod(struct udev_device *dev, const char *file, dev_t devnum, mod
preserve = 1;
udev_selinux_lsetfilecon(udev, file, mode);
} else {
char file_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
info(udev, "atomically replace existing file '%s'\n", file);
util_strlcpy(file_tmp, file, sizeof(file_tmp));
util_strlcat(file_tmp, TMP_FILE_EXT, sizeof(file_tmp));

24
udev/udevd.c
View File

@ -708,6 +708,28 @@ static void export_initial_seqnum(struct udev *udev)
}
}
/* create the nodes the we depend on to properly start up */
static void setup_initial_nodes(struct udev *udev)
{
struct udev_device *dev;
dev = udev_device_new_from_subsystem_sysname(udev, "mem", "null");
if (dev != NULL) {
udev_node_mknod(dev, "null", makedev(0,0), 0666, 0, 0);
udev_device_unref(dev);
}
dev = udev_device_new_from_subsystem_sysname(udev, "mem", "kmsg");
if (dev != NULL) {
udev_node_mknod(dev, "kmsg", makedev(0,0), 0660, 0, 0);
udev_device_unref(dev);
}
dev = udev_device_new_from_subsystem_sysname(udev, "tty", "console");
if (dev != NULL) {
udev_node_mknod(dev, "console", makedev(0,0), 0600, 0, 0);
udev_device_unref(dev);
}
}
static void startup_log(struct udev *udev)
{
FILE *f;
@ -814,6 +836,8 @@ int main(int argc, char *argv[])
goto exit;
}
setup_initial_nodes(udev);
/* make sure std{in,out,err} fd's are in a sane state */
fd = open("/dev/null", O_RDWR);
if (fd < 0) {