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read-only mirror of https://gitlab.freedesktop.org/mesa/drm
17dfe3ac93
We can't use drmSetMaster to query whether or not a drm fd is master
because it requires CAP_SYS_ADMIN, even if the fd *is* a master fd.
Pick DRM_IOCTL_MODE_ATTACHMODE as a long-deprecated ioctl that is
DRM_MASTER but not DRM_ROOT_ONLY as the probe by which we can detect
whether or not the fd is master.
This is useful for code that might get master by open()ing the drm device
while no other master exists, but can't call drmSetMaster itself because
it's not running as root or is in a container, where container-root isn't
real-root.
v2: Use the AUTH_MAGIC request rather than MODE_ATTACHMODE, as it's more
clearly related to master status.
v3: [Emil] Don't expose internals, check for -EACCES.
Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v2)
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
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|---|---|---|
| amdgpu | ||
| android | ||
| data | ||
| etnaviv | ||
| exynos | ||
| freedreno | ||
| include/drm | ||
| intel | ||
| libkms | ||
| m4 | ||
| man | ||
| nouveau | ||
| omap | ||
| radeon | ||
| tegra | ||
| tests | ||
| vc4 | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| configure.ac | ||
| CONTRIBUTING.rst | ||
| libdrm.pc.in | ||
| libdrm_lists.h | ||
| libdrm_macros.h | ||
| libsync.h | ||
| Makefile.am | ||
| Makefile.sources | ||
| meson.build | ||
| meson_options.txt | ||
| README.rst | ||
| RELEASING | ||
| util_double_list.h | ||
| util_math.h | ||
| xf86atomic.h | ||
| xf86drm.c | ||
| xf86drm.h | ||
| xf86drmHash.c | ||
| xf86drmHash.h | ||
| xf86drmMode.c | ||
| xf86drmMode.h | ||
| xf86drmRandom.c | ||
| xf86drmRandom.h | ||
| xf86drmSL.c | ||
libdrm - userspace library for drm
----------------------------------
This is libdrm, a userspace library for accessing the DRM, direct rendering
manager, on Linux, BSD and other operating systems that support the ioctl
interface.
The library provides wrapper functions for the ioctls to avoid exposing the
kernel interface directly, and for chipsets with drm memory manager, support
for tracking relocations and buffers.
New functionality in the kernel DRM drivers typically requires a new libdrm,
but a new libdrm will always work with an older kernel.
libdrm is a low-level library, typically used by graphics drivers such as
the Mesa drivers, the X drivers, libva and similar projects.
Compiling
---------
libdrm has two build systems, a legacy autotools build system, and a newer
meson build system. The meson build system is much faster, and offers a
slightly different interface, but otherwise provides an equivalent feature set.
To use it:
meson builddir/
By default this will install into /usr/local, you can change your prefix
with --prefix=/usr (or `meson configure builddir/ -Dprefix=/usr` after
the initial meson setup).
Then use ninja to build and install:
ninja -C builddir/ install
If you are installing into a system location you will need to run install
separately, and as root.
Alternatively you can invoke autotools configure:
./configure
By default, libdrm will install into the /usr/local/ prefix. If you
want to install this DRM to replace your system copy, pass
--prefix=/usr and --exec-prefix=/ to configure. If you are building
libdrm from a git checkout, you first need to run the autogen.sh
script. You can pass any options to autogen.sh that you would other
wise pass to configure, or you can just re-run configure with the
options you need once autogen.sh finishes.
Next step is to build libdrm:
make
and once make finishes successfully, install the package using
make install
If you are installing into a system location, you will need to be root
to perform the install step.