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libudev: add udev_device_new_from_environment()

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This commit is contained in:
Kay Sievers 2010-03-17 17:42:35 +01:00
parent 578cc8a808
commit fc8d61c53d
7 changed files with 192 additions and 128 deletions
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34
extras/usb_id/usb_id.c
View File

@ -456,8 +456,6 @@ int main(int argc, char **argv)
};
struct udev *udev;
struct udev_device *dev = NULL;
char syspath[UTIL_PATH_SIZE];
const char *devpath;
static int export;
int retval = 0;
@ -492,7 +490,7 @@ int main(int argc, char **argv)
export = 1;
break;
case 'h':
printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help] <devpath>\n"
printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help] [<devpath>]\n"
" --usb-info use usb strings instead\n"
" --num-info use numerical values\n"
" --export print values as environment keys\n"
@ -503,18 +501,26 @@ int main(int argc, char **argv)
}
}
devpath = argv[optind];
if (devpath == NULL) {
fprintf(stderr, "No device specified\n");
retval = 1;
goto exit;
}
util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
dev = udev_device_new_from_syspath(udev, syspath);
dev = udev_device_new_from_environment(udev);
if (dev == NULL) {
err(udev, "unable to access '%s'\n", devpath);
return 1;
char syspath[UTIL_PATH_SIZE];
const char *devpath;
devpath = argv[optind];
if (devpath == NULL) {
fprintf(stderr, "missing device\n");
retval = 1;
goto exit;
}
util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
dev = udev_device_new_from_syspath(udev, syspath);
if (dev == NULL) {
err(udev, "unable to access '%s'\n", devpath);
retval = 1;
goto exit;
return 1;
}
}
retval = usb_id(dev);

1
libudev/docs/libudev-sections.txt
View File

@ -35,6 +35,7 @@ udev_device_get_udev
udev_device_new_from_syspath
udev_device_new_from_devnum
udev_device_new_from_subsystem_sysname
udev_device_new_from_environment
udev_device_get_parent
udev_device_get_parent_with_subsystem_devtype
udev_device_get_devpath

1
libudev/exported_symbols
View File

@ -15,6 +15,7 @@ udev_list_entry_get_value
udev_device_new_from_syspath
udev_device_new_from_devnum
udev_device_new_from_subsystem_sysname
udev_device_new_from_environment
udev_device_get_parent
udev_device_get_parent_with_subsystem_devtype
udev_device_ref

214
libudev/libudev-device.c
View File

@ -13,6 +13,7 @@
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
@ -67,6 +68,7 @@ struct udev_device {
int refcount;
dev_t devnum;
int watch_handle;
int maj, min;
unsigned int parent_set:1;
unsigned int subsystem_set:1;
unsigned int devtype_set:1;
@ -77,6 +79,130 @@ struct udev_device {
unsigned int ignore_remove:1;
};
struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
{
udev_device->envp_uptodate = 0;
if (value == NULL) {
struct udev_list_entry *list_entry;
list_entry = udev_device_get_properties_list_entry(udev_device);
list_entry = udev_list_entry_get_by_name(list_entry, key);
if (list_entry != NULL)
udev_list_entry_delete(list_entry);
return NULL;
}
return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
}
static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
{
char name[UTIL_LINE_SIZE];
char *val;
util_strscpy(name, sizeof(name), property);
val = strchr(name, '=');
if (val == NULL)
return NULL;
val[0] = '\0';
val = &val[1];
if (val[0] == '\0')
val = NULL;
return udev_device_add_property(udev_device, name, val);
}
/*
* parse property string, and if needed, update internal values accordingly
*
* udev_device_add_property_from_string_parse_finish() needs to be
* called after adding properties, and its return value checked
*
* udev_device_set_info_loaded() needs to be set, to avoid trying
* to use a device without a DEVPATH set
*/
void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
{
if (strncmp(property, "DEVPATH=", 8) == 0) {
char path[UTIL_PATH_SIZE];
util_strscpyl(path, sizeof(path), udev_get_sys_path(udev_device->udev), &property[8], NULL);
udev_device_set_syspath(udev_device, path);
} else if (strncmp(property, "SUBSYSTEM=", 10) == 0) {
udev_device_set_subsystem(udev_device, &property[10]);
} else if (strncmp(property, "DEVTYPE=", 8) == 0) {
udev_device_set_devtype(udev_device, &property[8]);
} else if (strncmp(property, "DEVNAME=", 8) == 0) {
if (property[8] == '/')
udev_device_set_devnode(udev_device, &property[8]);
else
udev_device_set_knodename(udev_device, &property[8]);
} else if (strncmp(property, "DEVLINKS=", 9) == 0) {
char devlinks[UTIL_PATH_SIZE];
char *slink;
char *next;
util_strscpy(devlinks, sizeof(devlinks), &property[9]);
slink = devlinks;
next = strchr(slink, ' ');
while (next != NULL) {
next[0] = '\0';
udev_device_add_devlink(udev_device, slink, 0);
slink = &next[1];
next = strchr(slink, ' ');
}
if (slink[0] != '\0')
udev_device_add_devlink(udev_device, slink, 0);
} else if (strncmp(property, "DRIVER=", 7) == 0) {
udev_device_set_driver(udev_device, &property[7]);
} else if (strncmp(property, "ACTION=", 7) == 0) {
udev_device_set_action(udev_device, &property[7]);
} else if (strncmp(property, "MAJOR=", 6) == 0) {
udev_device->maj = strtoull(&property[6], NULL, 10);
} else if (strncmp(property, "MINOR=", 6) == 0) {
udev_device->min = strtoull(&property[6], NULL, 10);
} else if (strncmp(property, "DEVPATH_OLD=", 12) == 0) {
udev_device_set_devpath_old(udev_device, &property[12]);
} else if (strncmp(property, "SEQNUM=", 7) == 0) {
udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
} else if (strncmp(property, "TIMEOUT=", 8) == 0) {
udev_device_set_timeout(udev_device, strtoull(&property[8], NULL, 10));
} else {
udev_device_add_property_from_string(udev_device, property);
}
}
int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
{
if (udev_device->maj > 0)
udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
udev_device->maj = 0;
udev_device->min = 0;
if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
return -EINVAL;
return 0;
}
/**
* udev_device_get_property_value:
* @udev_device: udev device
* @key: property name
*
* Returns: the value of a device property, or #NULL if there is no such property.
**/
const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
{
struct udev_list_entry *list_entry;
if (udev_device == NULL)
return NULL;
if (key == NULL)
return NULL;
list_entry = udev_device_get_properties_list_entry(udev_device);
list_entry = udev_list_entry_get_by_name(list_entry, key);
return udev_list_entry_get_value(list_entry);
}
int udev_device_read_db(struct udev_device *udev_device)
{
struct stat stats;
@ -451,6 +577,42 @@ found:
return udev_device_new_from_syspath(udev, path_full);
}
/**
* udev_device_new_from_environment
* @udev: udev library context
*
* Create new udev device, and fill in information from the
* current process environment. This only works reliable if
* the process is called from a udev rule. It is usually used
* for tools executed from IMPORT= rules.
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
struct udev_device *udev_device_new_from_environment(struct udev *udev)
{
int i;
struct udev_device *udev_device;
udev_device = udev_device_new(udev);
if (udev_device == NULL)
return NULL;
udev_device_set_info_loaded(udev_device);
for (i = 0; environ[i] != NULL; i++)
udev_device_add_property_from_string_parse(udev_device, environ[i]);
if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
info(udev, "missing values, invalid device\n");
udev_device_unref(udev_device);
udev_device = NULL;
}
return udev_device;
}
static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
{
struct udev_device *udev_device_parent = NULL;
@ -1072,58 +1234,6 @@ int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink
return 0;
}
struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
{
udev_device->envp_uptodate = 0;
if (value == NULL) {
struct udev_list_entry *list_entry;
list_entry = udev_device_get_properties_list_entry(udev_device);
list_entry = udev_list_entry_get_by_name(list_entry, key);
if (list_entry != NULL)
udev_list_entry_delete(list_entry);
return NULL;
}
return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
}
struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
{
char name[UTIL_LINE_SIZE];
char *val;
util_strscpy(name, sizeof(name), property);
val = strchr(name, '=');
if (val == NULL)
return NULL;
val[0] = '\0';
val = &val[1];
if (val[0] == '\0')
val = NULL;
return udev_device_add_property(udev_device, name, val);
}
/**
* udev_device_get_property_value:
* @udev_device: udev device
* @key: property name
*
* Returns: the value of a device property, or #NULL if there is no such property.
**/
const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
{
struct udev_list_entry *list_entry;
if (udev_device == NULL)
return NULL;
if (key == NULL)
return NULL;
list_entry = udev_device_get_properties_list_entry(udev_device);
list_entry = udev_list_entry_get_by_name(list_entry, key);
return udev_list_entry_get_value(list_entry);
}
#define ENVP_SIZE 128
#define MONITOR_BUF_SIZE 4096
static int update_envp_monitor_buf(struct udev_device *udev_device)

66
libudev/libudev-monitor.c
View File

@ -497,11 +497,6 @@ struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monito
ssize_t buflen;
ssize_t bufpos;
struct udev_monitor_netlink_header *nlh;
int devpath_set = 0;
int subsystem_set = 0;
int action_set = 0;
int maj = 0;
int min = 0;
retry:
if (udev_monitor == NULL)
@ -589,6 +584,7 @@ retry:
udev_device = udev_device_new(udev_monitor->udev);
if (udev_device == NULL)
return NULL;
udev_device_set_info_loaded(udev_device);
while (bufpos < buflen) {
char *key;
@ -599,60 +595,11 @@ retry:
if (keylen == 0)
break;
bufpos += keylen + 1;
if (strncmp(key, "DEVPATH=", 8) == 0) {
char path[UTIL_PATH_SIZE];
util_strscpyl(path, sizeof(path), udev_get_sys_path(udev_monitor->udev), &key[8], NULL);
udev_device_set_syspath(udev_device, path);
devpath_set = 1;
} else if (strncmp(key, "SUBSYSTEM=", 10) == 0) {
udev_device_set_subsystem(udev_device, &key[10]);
subsystem_set = 1;
} else if (strncmp(key, "DEVTYPE=", 8) == 0) {
udev_device_set_devtype(udev_device, &key[8]);
} else if (strncmp(key, "DEVNAME=", 8) == 0) {
if (key[8] == '/')
udev_device_set_devnode(udev_device, &key[8]);
else
udev_device_set_knodename(udev_device, &key[8]);
} else if (strncmp(key, "DEVLINKS=", 9) == 0) {
char devlinks[UTIL_PATH_SIZE];
char *slink;
char *next;
util_strscpy(devlinks, sizeof(devlinks), &key[9]);
slink = devlinks;
next = strchr(slink, ' ');
while (next != NULL) {
next[0] = '\0';
udev_device_add_devlink(udev_device, slink, 0);
slink = &next[1];
next = strchr(slink, ' ');
}
if (slink[0] != '\0')
udev_device_add_devlink(udev_device, slink, 0);
} else if (strncmp(key, "DRIVER=", 7) == 0) {
udev_device_set_driver(udev_device, &key[7]);
} else if (strncmp(key, "ACTION=", 7) == 0) {
udev_device_set_action(udev_device, &key[7]);
action_set = 1;
} else if (strncmp(key, "MAJOR=", 6) == 0) {
maj = strtoull(&key[6], NULL, 10);
} else if (strncmp(key, "MINOR=", 6) == 0) {
min = strtoull(&key[6], NULL, 10);
} else if (strncmp(key, "DEVPATH_OLD=", 12) == 0) {
udev_device_set_devpath_old(udev_device, &key[12]);
} else if (strncmp(key, "SEQNUM=", 7) == 0) {
udev_device_set_seqnum(udev_device, strtoull(&key[7], NULL, 10));
} else if (strncmp(key, "TIMEOUT=", 8) == 0) {
udev_device_set_timeout(udev_device, strtoull(&key[8], NULL, 10));
} else {
udev_device_add_property_from_string(udev_device, key);
}
udev_device_add_property_from_string_parse(udev_device, key);
}
if (!devpath_set || !subsystem_set || !action_set) {
info(udev_monitor->udev, "missing values, skip\n");
if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
info(udev_monitor->udev, "missing values, invalid device\n");
udev_device_unref(udev_device);
return NULL;
}
@ -673,9 +620,6 @@ retry:
return NULL;
}
if (maj > 0)
udev_device_set_devnum(udev_device, makedev(maj, min));
udev_device_set_info_loaded(udev_device);
return udev_device;
}

3
libudev/libudev-private.h
View File

@ -71,7 +71,8 @@ int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode
int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink, int unique);
void udev_device_cleanup_devlinks_list(struct udev_device *udev_device);
struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value);
struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property);
void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property);
int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device);
char **udev_device_get_properties_envp(struct udev_device *udev_device);
ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf);
int udev_device_read_db(struct udev_device *udev_device);

1
libudev/libudev.h
View File

@ -75,6 +75,7 @@ struct udev *udev_device_get_udev(struct udev_device *udev_device);
struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath);
struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum);
struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname);
struct udev_device *udev_device_new_from_environment(struct udev *udev);
/* udev_device_get_parent_*() does not take a reference on the returned device, it is automatically unref'd with the parent */
struct udev_device *udev_device_get_parent(struct udev_device *udev_device);
struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device,