diff options
Diffstat (limited to 'kernel/drivers/fb.c')
| -rw-r--r-- | kernel/drivers/fb.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/kernel/drivers/fb.c b/kernel/drivers/fb.c index 2db05f2..0a9494a 100644 --- a/kernel/drivers/fb.c +++ b/kernel/drivers/fb.c @@ -2,6 +2,7 @@ #include <assert.h> #include <def.h> +#include <errno.h> #include <fb.h> #include <fs.h> #include <ioctl.h> @@ -23,7 +24,8 @@ struct vbe_basic { static u32 dev_id = 0; static struct vid_info *info = NULL; -static s32 fb_ioctl(u32 request, void *arg1, void *arg2, void *arg3, struct device *dev) +static u32 fb_owner = 0; +static res fb_ioctl(u32 request, void *arg1, void *arg2, void *arg3, struct device *dev) { UNUSED(arg2); UNUSED(arg3); @@ -32,17 +34,26 @@ static s32 fb_ioctl(u32 request, void *arg1, void *arg2, void *arg3, struct devi switch (request) { case IO_FB_GET: { if (!info) - return -1; + return -ENOENT; + + if (!arg1 || !memory_valid(arg1)) + return -EFAULT; + + if (fb_owner != 0 && proc_from_pid(fb_owner)) + return -EBUSY; + else + fb_owner = proc_current()->pid; + memcpy(arg1, info->vbe, sizeof(struct vbe_basic)); fb_map_buffer(proc_current()->page_dir, info); - return 0; + return EOK; } default: - return -1; + return -EINVAL; } } -static s32 fb_ready(void) +static res fb_ready(void) { return 1; } |