/*
* udev_db.c
*
- * Userspace devfs
- *
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
#include <stdio.h>
#include <string.h>
#include <stddef.h>
+#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include "libsysfs/sysfs/libsysfs.h"
+#include "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_utils.h"
#include "logging.h"
-#include "udev_db.h"
-#define PATH_TO_NAME_CHAR '@'
-static int get_db_filename(const char *devpath, char *filename, int len)
+static int devpath_to_db_path(const char *devpath, char *filename, size_t len)
{
- char temp[SYSFS_PATH_MAX];
- char *pos;
+ size_t start, end, i;
+
+ /* add location of db files */
+ strlcpy(filename, udev_root, len);
+ start = strlcat(filename, "/"DB_DIR, len);
+ end = strlcat(filename, devpath, len);
+ if (end > len)
+ end = len;
/* replace '/' to transform path into a filename */
- strfieldcpy(temp, devpath);
- pos = strchr(&temp[1], '/');
- while (pos) {
- pos[0] = PATH_TO_NAME_CHAR;
- pos = strchr(&pos[1], '/');
- }
- snprintf(filename, len, "%s%s", udev_db_path, temp);
- filename[len-1] = '\0';
+ for (i = start+1; i < end; i++)
+ if (filename[i] == '/')
+ filename[i] = PATH_TO_NAME_CHAR;
+
+ return 0;
+}
+
+static int db_file_to_devpath(const char *filename, char *devpath, size_t len)
+{
+ size_t end, i;
+
+ strlcpy(devpath, "/", len);
+ end = strlcat(devpath, filename, len);
+
+ /* replace PATH_TO_NAME_CHAR to transform name into devpath */
+ for (i = 1; i < end; i++)
+ if (devpath[i] == PATH_TO_NAME_CHAR)
+ devpath[i] = '/';
return 0;
}
int udev_db_add_device(struct udevice *udev)
{
- char filename[SYSFS_PATH_MAX];
+ char filename[PATH_SIZE];
+ struct name_entry *name_loop;
FILE *f;
if (udev->test_run)
return 0;
- get_db_filename(udev->devpath, filename, SYSFS_PATH_MAX);
+ /* don't write anything if udev created only the node with the
+ * kernel name without any interesting data to remember
+ */
+ if (strcmp(udev->name, udev->kernel_name) == 0 &&
+ list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
+ !udev->partitions && !udev->ignore_remove) {
+ dbg("nothing interesting to store in udevdb, skip");
+ goto exit;
+ }
+ devpath_to_db_path(udev->devpath, filename, sizeof(filename));
create_path(filename);
-
f = fopen(filename, "w");
if (f == NULL) {
- dbg("unable to create db file '%s'", filename);
+ err("unable to create db file '%s': %s", filename, strerror(errno));
return -1;
}
dbg("storing data for device '%s' in '%s'", udev->devpath, filename);
- fprintf(f, "P:%s\n", udev->devpath);
fprintf(f, "N:%s\n", udev->name);
- fprintf(f, "S:%s\n", udev->symlink);
+ list_for_each_entry(name_loop, &udev->symlink_list, node)
+ fprintf(f, "S:%s\n", name_loop->name);
fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
- fprintf(f, "A:%u\n", udev->partitions);
- fprintf(f, "R:%u\n", udev->ignore_remove);
-
+ if (udev->partitions)
+ fprintf(f, "A:%u\n", udev->partitions);
+ if (udev->ignore_remove)
+ fprintf(f, "R:%u\n", udev->ignore_remove);
+ list_for_each_entry(name_loop, &udev->env_list, node)
+ fprintf(f, "E:%s\n", name_loop->name);
fclose(f);
+exit:
return 0;
}
-static int parse_db_file(struct udevice *udev, const char *filename)
+int udev_db_get_device(struct udevice *udev, const char *devpath)
{
- char line[NAME_SIZE];
- char temp[NAME_SIZE];
+ char filename[PATH_SIZE];
+ char line[PATH_SIZE];
unsigned int major, minor;
char *bufline;
char *buf;
size_t cur;
size_t count;
+ devpath_to_db_path(devpath, filename, sizeof(filename));
if (file_map(filename, &buf, &bufsize) != 0) {
- dbg("unable to read db file '%s'", filename);
+ info("no db file to read %s: %s", filename, strerror(errno));
return -1;
}
+ strlcpy(udev->devpath, devpath, sizeof(udev->devpath));
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
cur += count+1;
switch(bufline[0]) {
- case 'P':
- if (count > DEVPATH_SIZE)
- count = DEVPATH_SIZE-1;
- strncpy(udev->devpath, &bufline[2], count-2);
- udev->devpath[count-2] = '\0';
- break;
case 'N':
- if (count > NAME_SIZE)
- count = NAME_SIZE-1;
- strncpy(udev->name, &bufline[2], count-2);
+ if (count > sizeof(udev->name))
+ count = sizeof(udev->name);
+ memcpy(udev->name, &bufline[2], count-2);
udev->name[count-2] = '\0';
break;
case 'M':
- if (count > NAME_SIZE)
- count = NAME_SIZE-1;
- strncpy(temp, &bufline[2], count-2);
- temp[count-2] = '\0';
- sscanf(temp, "%u:%u", &major, &minor);
+ if (count > sizeof(line))
+ count = sizeof(line);
+ memcpy(line, &bufline[2], count-2);
+ line[count-2] = '\0';
+ sscanf(line, "%u:%u", &major, &minor);
udev->devt = makedev(major, minor);
break;
case 'S':
- if (count > NAME_SIZE)
- count = NAME_SIZE-1;
- strncpy(udev->symlink, &bufline[2], count-2);
- udev->symlink[count-2] = '\0';
+ if (count > sizeof(line))
+ count = sizeof(line);
+ memcpy(line, &bufline[2], count-2);
+ line[count-2] = '\0';
+ name_list_add(&udev->symlink_list, line, 0);
break;
case 'A':
- if (count > NAME_SIZE)
- count = NAME_SIZE-1;
- strncpy(line, &bufline[2], count-2);
+ if (count > sizeof(line))
+ count = sizeof(line);
+ memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
udev->partitions = atoi(line);
break;
case 'R':
- if (count > NAME_SIZE)
- count = NAME_SIZE-1;
- strncpy(line, &bufline[2], count-2);
+ if (count > sizeof(line))
+ count = sizeof(line);
+ memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
udev->ignore_remove = atoi(line);
break;
+ case 'E':
+ if (count > sizeof(line))
+ count = sizeof(line);
+ memcpy(line, &bufline[2], count-2);
+ line[count-2] = '\0';
+ name_list_add(&udev->env_list, line, 0);
+ break;
}
}
+ file_unmap(buf, bufsize);
if (udev->name[0] == '\0')
return -1;
int udev_db_delete_device(struct udevice *udev)
{
- char filename[SYSFS_PATH_MAX];
+ char filename[PATH_SIZE];
- get_db_filename(udev->devpath, filename, SYSFS_PATH_MAX);
+ devpath_to_db_path(udev->devpath, filename, sizeof(filename));
unlink(filename);
return 0;
}
-int udev_db_get_device_by_devpath(struct udevice *udev, const char *devpath)
+int udev_db_lookup_name(const char *name, char *devpath, size_t len)
{
- char filename[SYSFS_PATH_MAX];
-
- get_db_filename(devpath, filename, SYSFS_PATH_MAX);
-
- return parse_db_file(udev, filename);
-}
-
-int udev_db_get_device_byname(struct udevice *udev, const char *name)
-{
- struct dirent *ent;
+ char dbpath[PATH_MAX];
DIR *dir;
- char filename[NAME_SIZE];
- struct udevice db_udev;
+ int found = 0;
- dir = opendir(udev_db_path);
+ strlcpy(dbpath, udev_root, sizeof(dbpath));
+ strlcat(dbpath, "/"DB_DIR, sizeof(dbpath));
+ dir = opendir(dbpath);
if (dir == NULL) {
- dbg("unable to udev db '%s'", udev_db_path);
+ err("unable to open udev_db '%s': %s", dbpath, strerror(errno));
return -1;
}
- while (1) {
+ while (!found) {
+ struct dirent *ent;
+ char filename[PATH_SIZE];
+ char nodename[PATH_SIZE];
+ char *bufline;
+ char *buf;
+ size_t bufsize;
+ size_t cur;
+ size_t count;
+
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
-
if (ent->d_name[0] == '.')
continue;
- snprintf(filename, NAME_SIZE, "%s/%s", udev_db_path, ent->d_name);
- filename[NAME_SIZE-1] = '\0';
+ snprintf(filename, sizeof(filename), "%s/%s", dbpath, ent->d_name);
+ filename[sizeof(filename)-1] = '\0';
+ dbg("looking at '%s'", filename);
- memset(&db_udev, 0x00, sizeof(struct udevice));
- if (parse_db_file(&db_udev, filename) == 0) {
- char *pos;
- unsigned int len;
-
- if (strncmp(name, db_udev.name, NAME_SIZE) == 0) {
- goto found;
- }
-
- foreach_strpart(db_udev.symlink, " ", pos, len) {
- if (strncmp(name, pos, len) != 0)
- continue;
+ if (file_map(filename, &buf, &bufsize) != 0) {
+ err("unable to read db file '%s': %s", filename, strerror(errno));
+ continue;
+ }
- if (len == strlen(name))
- goto found;
+ cur = 0;
+ while (cur < bufsize && !found) {
+ count = buf_get_line(buf, bufsize, cur);
+ bufline = &buf[cur];
+ cur += count+1;
+
+ switch(bufline[0]) {
+ case 'N':
+ case 'S':
+ if (count > sizeof(nodename))
+ count = sizeof(nodename);
+ memcpy(nodename, &bufline[2], count-2);
+ nodename[count-2] = '\0';
+ dbg("compare '%s' '%s'", nodename, name);
+ if (strcmp(nodename, name) == 0) {
+ db_file_to_devpath(ent->d_name, devpath, len);
+ found = 1;
+ }
+ break;
+ default:
+ continue;
}
-
}
+ file_unmap(buf, bufsize);
}
closedir(dir);
+ if (found)
+ return 0;
+ else
+ return -1;
+}
- return -1;
+int udev_db_get_all_entries(struct list_head *name_list)
+{
+ char dbpath[PATH_MAX];
+ DIR *dir;
-found:
- closedir(dir);
+ strlcpy(dbpath, udev_root, sizeof(dbpath));
+ strlcat(dbpath, "/"DB_DIR, sizeof(dbpath));
+ dir = opendir(dbpath);
+ if (dir == NULL) {
+ err("unable to open udev_db '%s': %s", dbpath, strerror(errno));
+ return -1;
+ }
+
+ while (1) {
+ struct dirent *ent;
+ char filename[PATH_SIZE] = "/";
+ size_t end, i;
+
+ ent = readdir(dir);
+ if (ent == NULL || ent->d_name[0] == '\0')
+ break;
+ if (ent->d_name[0] == '.')
+ continue;
- strfieldcpy(udev->devpath, db_udev.devpath);
- strfieldcpy(udev->name, db_udev.name);
- strfieldcpy(udev->symlink, db_udev.symlink);
- udev->partitions = db_udev.partitions;
- udev->ignore_remove = db_udev.ignore_remove;
- udev->devt = db_udev.devt;
+ end = strlcat(filename, ent->d_name, sizeof(filename));
+ for (i = 1; i < end; i++)
+ if (filename[i] == PATH_TO_NAME_CHAR)
+ filename[i] = '/';
+ name_list_add(name_list, filename, 1);
+ dbg("added '%s'", filename);
+ }
+ closedir(dir);
return 0;
}
~ianmdlvl / elogind.git / blobdiff