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devices: Use path to check device type

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FreeBSD device numbers cannot be used to check the type of a device, as
they are merely unique filesystem IDs.

As the paths we use have been sanitized with realpath, we can simply use
the path to check if a requested file is an evdev or drm device. This
also allows us to make the check before the file is opened.
This commit is contained in:
Kenny Levinsen 2020-08-01 03:23:56 +02:00
parent dc9c7bff71
commit e129536a08
7 changed files with 102 additions and 46 deletions
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13
common/evdev.c
View file

@ -1,9 +1,11 @@
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#if defined(__linux__)
#include <linux/input.h>
#include <linux/major.h>
#include <sys/sysmacros.h>
#elif defined(__FreeBSD__)
#include <dev/evdev/input.h>
@ -11,12 +13,21 @@
#error Unsupported platform
#endif
#include "compiler.h"
#include "evdev.h"
int path_is_evdev(const char *path) {
static const char prefix[] = "/dev/input/event";
static const size_t prefixlen = STRLEN(prefix);
return strncmp(prefix, path, prefixlen) == 0;
}
int evdev_revoke(int fd) {
return ioctl(fd, EVIOCREVOKE, NULL);
}
#if defined(__linux__)
int dev_is_evdev(dev_t device) {
return major(device) == 13;
return major(device) == INPUT_MAJOR;
}
#endif