552 lines
13 KiB
C
552 lines
13 KiB
C
#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include "udev.h"
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#include "udev_list.h"
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#include "udev_util.h"
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#include "udev_device.h"
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struct udev_device
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{
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struct udev_list_entry properties;
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struct udev_list_entry sysattrs;
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struct udev_device *parent;
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struct udev *udev;
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int refcount;
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};
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UDEV_EXPORT const char *udev_device_get_syspath(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "SYSPATH");
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}
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UDEV_EXPORT const char *udev_device_get_sysname(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "DEVNAME");
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}
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UDEV_EXPORT const char *udev_device_get_sysnum(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "SYSNUM");
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}
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UDEV_EXPORT const char *udev_device_get_devpath(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "DEVPATH");
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}
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UDEV_EXPORT const char *udev_device_get_devnode(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "DEVNODE");
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}
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UDEV_EXPORT dev_t udev_device_get_devnum(struct udev_device *udev_device)
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{
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const char *major, *minor;
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if (!udev_device) {
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return makedev(0, 0);
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}
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major = udev_device_get_property_value(udev_device, "MAJOR");
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minor = udev_device_get_property_value(udev_device, "MINOR");
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if (!major && !minor) {
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return makedev(0, 0);
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}
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return makedev(atoi(major), atoi(minor));
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}
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UDEV_EXPORT const char *udev_device_get_devtype(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "DEVTYPE");
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}
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UDEV_EXPORT const char *udev_device_get_subsystem(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "SUBSYSTEM");
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}
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UDEV_EXPORT const char *udev_device_get_driver(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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return udev_device_get_property_value(udev_device, "DRIVER");
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}
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UDEV_EXPORT struct udev *udev_device_get_udev(struct udev_device *udev_device)
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{
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return udev_device ? udev_device->udev : NULL;
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}
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UDEV_EXPORT struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
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{
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char *path;
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int slash;
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if (!udev_device) {
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return NULL;
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}
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path = strdup(udev_device_get_property_value(udev_device, "SYSPATH"));
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while (1) {
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slash = strrchr(path, '/') - path;
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if (!slash) {
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free(path);
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return NULL;
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}
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path[slash] = '\0';
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udev_device->parent = udev_device_new_from_syspath(udev_device->udev, path);
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if (udev_device->parent) {
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free(path);
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return udev_device->parent;
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}
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}
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}
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UDEV_EXPORT struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
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{
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const char *parent_subsystem, *parent_devtype;
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struct udev_device *parent;
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if (!udev_device || !subsystem) {
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return NULL;
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}
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parent = udev_device_get_parent(udev_device);
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while (parent) {
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parent_subsystem = udev_device_get_subsystem(parent);
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parent_devtype = udev_device_get_devtype(parent);
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if (parent_subsystem && strcmp(parent_subsystem, subsystem) == 0) {
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if (!devtype) {
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return parent;
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}
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if (parent_devtype && strcmp(parent_devtype, devtype) == 0) {
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return parent;
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}
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}
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parent = udev_device_get_parent(parent);
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}
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return NULL;
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}
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UDEV_EXPORT int udev_device_get_is_initialized(struct udev_device *udev_device)
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{
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return 1;
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}
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UDEV_EXPORT const char *udev_device_get_action(struct udev_device *udev_device)
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{
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return NULL;
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}
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UDEV_EXPORT int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
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{
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// XXX NOT IMPLEMENTED
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return 0;
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}
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UDEV_EXPORT struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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UDEV_EXPORT struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
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{
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return udev_device ? udev_list_entry_get_next(&udev_device->properties) : NULL;
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}
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UDEV_EXPORT struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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UDEV_EXPORT struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
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{
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return udev_device ? udev_list_entry_get_next(&udev_device->sysattrs) : NULL;
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}
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UDEV_EXPORT const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
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{
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struct udev_list_entry *list_entry;
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list_entry = udev_list_entry_get_by_name(&udev_device->properties, key);
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return udev_list_entry_get_value(list_entry);
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}
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UDEV_EXPORT const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
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{
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struct udev_list_entry *list_entry;
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char data[1024], *path = NULL;
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struct stat st;
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ssize_t len;
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int fd;
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if (!udev_device || !sysattr) {
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return NULL;
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}
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list_entry = udev_list_entry_get_by_name(&udev_device->sysattrs, sysattr);
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if (list_entry) {
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return udev_list_entry_get_value(list_entry);
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}
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if (xasprintf(path, "%s/%s", udev_device_get_property_value(udev_device, "SYSPATH"), sysattr) == -1) {
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return NULL;
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}
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if (stat(path, &st) != 0 || S_ISDIR(st.st_mode)) {
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free(path);
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return NULL;
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}
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fd = open(path, O_RDONLY | O_NOFOLLOW);
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if (fd == -1) {
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free(path);
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return NULL;
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}
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len = read(fd, data, sizeof(data));
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if (len == -1) {
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close(fd);
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free(path);
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return NULL;
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}
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close(fd);
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free(path);
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data[len] = '\0'; // XXX strip trailing '\n'
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list_entry = udev_list_entry_add(&udev_device->sysattrs, sysattr, data);
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return udev_list_entry_get_value(list_entry);
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}
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UDEV_EXPORT int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, const char *value)
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{
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size_t len = strlen(value);
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char *path = NULL;
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struct stat st;
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int fd;
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if (!udev_device || !sysattr || !value) {
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return -1;
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}
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if (xasprintf(path, "%s/%s", udev_device_get_property_value(udev_device, "SYSPATH"), sysattr) == -1) {
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return -1;
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}
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if (stat(path, &st) != 0 || S_ISDIR(st.st_mode)) {
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free(path);
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return -1;
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}
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fd = open(path, O_WRONLY | O_NOFOLLOW);
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if (fd == -1) {
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free(path);
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return -1;
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}
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if (write(fd, value, len) == -1) {
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close(fd);
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free(path);
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return -1;
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}
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close(fd);
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free(path);
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udev_list_entry_add(&udev_device->sysattrs, sysattr, value);
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return 0;
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}
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const char *udev_device_read_symlink(struct udev_device *udev_device, const char *name)
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{
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char *link, *data, *path = NULL;
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if (xasprintf(path, "%s/%s", udev_device_get_property_value(udev_device, "SYSPATH"), name) == -1) {
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return NULL;
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}
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link = realpath(path, NULL); // XXX XSI
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if (!link) {
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free(path);
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return NULL;
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}
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data = strrchr(link, '/') + 1;
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free(path);
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free(link);
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return data;
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}
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void udev_device_set_properties_from_uevent(struct udev_device *udev_device)
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{
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char *key, *val, *line, *path = NULL;
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char *sysname, *devnode = NULL;
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size_t len = 0;
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FILE *file;
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int i;
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if (xasprintf(path, "%s/uevent", udev_device_get_property_value(udev_device, "SYSPATH")) == -1) {
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return;
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}
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file = fopen(path, "r");
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if (!file) {
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free(path);
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return;
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}
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while (getline(&line, &len, file) != -1) {
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if (strncmp(line, "DEVNAME", 7) == 0) {
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sysname = strrchr(line + 8, '/');
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if (!sysname) {
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sysname = line + 8;
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}
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else {
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sysname++;
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}
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udev_list_entry_add(&udev_device->properties, "DEVNAME", sysname);
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for (i = 0; sysname[i] != '\0'; i++) {
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if (sysname[i] >= '0' && sysname[i] <= '9') {
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udev_list_entry_add(&udev_device->properties, "SYSNUM", sysname + i);
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break;
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}
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}
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if (xasprintf(devnode, "/dev/%s", line + 8) == -1) {
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continue;
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}
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udev_list_entry_add(&udev_device->properties, "DEVNODE", devnode);
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free(devnode);
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}
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else if (strncmp(line, "DEVTYPE", 7) == 0) {
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udev_list_entry_add(&udev_device->properties, "DEVTYPE", line + 8);
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}
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else if (strncmp(line, "DRIVER", 6) == 0) {
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continue;
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}
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else if (strncmp(line, "MAJOR", 5) == 0) {
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udev_list_entry_add(&udev_device->properties, "MAJOR", line + 6);
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}
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else if (strncmp(line, "MINOR", 5) == 0) {
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udev_list_entry_add(&udev_device->properties, "MINOR", line + 6);
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}
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else if (strchr(line, '=')) {
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val = strchr(line, '=') + 1;
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key = strdup(line);
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for (i = 0; key[i] != '\0'; i++) {
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if (key[i] == '=') {
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key[i] = '\0';
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break;
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}
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}
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udev_list_entry_add(&udev_device->properties, key, val);
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free(key);
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}
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}
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fclose(file);
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free(line);
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free(path);
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}
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void udev_device_set_properties_from_ioctl(struct udev_device *udev_device)
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{
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// TODO extract INPUT properties using libevdev or direct ioctl's(complex), HELP WANTED!
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}
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UDEV_EXPORT struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
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{
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struct udev_device *udev_device;
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char *path, *file = NULL;
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struct stat st;
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if (!udev || !syspath) {
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return NULL;
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}
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path = realpath(syspath, NULL); // XXX XSI
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if (!path) {
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return NULL;
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}
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if (stat(path, &st) != 0 || S_ISDIR(st.st_mode) == 0) {
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free(path);
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return NULL;
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}
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if (xasprintf(file, "%s/uevent", path) == -1) {
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free(path);
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return NULL;
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}
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if (access(file, R_OK) == -1) {
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free(file);
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free(path);
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return NULL;
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}
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udev_device = calloc(1, sizeof(struct udev_device));
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if (!udev_device) {
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free(file);
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free(path);
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return NULL;
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}
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udev_device->udev = udev;
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udev_device->refcount = 1;
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udev_list_entry_init(&udev_device->properties);
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udev_list_entry_init(&udev_device->sysattrs);
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udev_list_entry_add(&udev_device->properties, "SYSPATH", path);
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udev_list_entry_add(&udev_device->properties, "DEVPATH", path + 4);
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udev_list_entry_add(&udev_device->properties, "DRIVER", udev_device_read_symlink(udev_device, "driver"));
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udev_list_entry_add(&udev_device->properties, "SUBSYSTEM", udev_device_read_symlink(udev_device, "subsystem"));
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udev_device_set_properties_from_uevent(udev_device);
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udev_device_set_properties_from_ioctl(udev_device);
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free(file);
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free(path);
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return udev_device;
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}
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UDEV_EXPORT struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
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{
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struct udev_device *udev_device;
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char *path = NULL;
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if (!udev || !type || !devnum) {
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return NULL;
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}
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switch (type) {
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case 'c':
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xasprintf(path, "/sys/dev/char/%d:%d", major(devnum), minor(devnum));
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break;
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case 'b':
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xasprintf(path, "/sys/dev/block/%d:%d", major(devnum), minor(devnum));
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break;
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default:
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return NULL;
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}
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udev_device = udev_device_new_from_syspath(udev, path);
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free(path);
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return udev_device;
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}
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UDEV_EXPORT struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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UDEV_EXPORT struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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UDEV_EXPORT struct udev_device *udev_device_new_from_environment(struct udev *udev)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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UDEV_EXPORT struct udev_device *udev_device_ref(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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udev_device->refcount++;
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return udev_device;
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}
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UDEV_EXPORT struct udev_device *udev_device_unref(struct udev_device *udev_device)
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{
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if (!udev_device) {
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return NULL;
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}
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if (--udev_device->refcount > 0) {
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return NULL;
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}
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if (udev_device->parent) {
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udev_device_unref(udev_device->parent);
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}
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udev_list_entry_free_all(&udev_device->properties);
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udev_list_entry_free_all(&udev_device->sysattrs);
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|
free(udev_device);
|
|
return NULL;
|
|
}
|