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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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22
common/drm.c
View file

@ -1,10 +1,12 @@
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#ifdef __linux__
#if defined(__linux__)
#include <sys/sysmacros.h>
#endif
#include "compiler.h"
#include "drm.h"
// From libdrm
@ -21,6 +23,24 @@ int drm_drop_master(int fd) {
return ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
}
static int path_is_drm_card(const char *path) {
static const char prefix[] = "/dev/dri/card";
static const int prefixlen = STRLEN(prefix);
return strncmp(prefix, path, prefixlen) == 0;
}
static int path_is_drm_render(const char *path) {
static const char prefix[] = "/dev/dri/renderD";
static const int prefixlen = STRLEN(prefix);
return strncmp(prefix, path, prefixlen) == 0;
}
int path_is_drm(const char *path) {
return path_is_drm_card(path) || path_is_drm_render(path);
}
#if defined(__linux__)
int dev_is_drm(dev_t device) {
return major(device) == 226;
}
#endif