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backend/drm: introduce wlr_drm_backend_get_non_master_fd
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2 changed files with 33 additions and 0 deletions
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@ -3,6 +3,7 @@
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#include <drm_fourcc.h>
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#include <drm_mode.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdio.h>
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@ -1479,6 +1480,31 @@ void destroy_drm_connector(struct wlr_drm_connector *conn) {
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free(conn);
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}
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int wlr_drm_backend_get_non_master_fd(struct wlr_backend *backend) {
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assert(backend);
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struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
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char *path = drmGetDeviceNameFromFd2(drm->fd);
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if (!path) {
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wlr_log(WLR_ERROR, "Failed to get device name from DRM fd");
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return -1;
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}
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int fd = open(path, O_RDWR | O_CLOEXEC);
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if (fd < 0) {
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wlr_log_errno(WLR_ERROR, "Unable to clone DRM fd for client fd");
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free(path);
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return -1;
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}
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if (drmIsMaster(fd) && drmDropMaster(fd) < 0) {
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wlr_log_errno(WLR_ERROR, "Failed to drop master");
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return -1;
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}
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return fd;
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}
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/* TODO: make the function return a `wlr_drm_lease` to provide a destroy event
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* that can be fired when the kernel notifies us through uevent that the lease
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* has been destroyed
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@ -33,6 +33,13 @@ bool wlr_output_is_drm(struct wlr_output *output);
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*/
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uint32_t wlr_drm_connector_get_id(struct wlr_output *output);
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/**
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* Tries to open non-master DRM FD. The compositor must not call `drmSetMaster`
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* on the returned FD.
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* Returns a valid opened DRM FD, or -1 on error.
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*/
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int wlr_drm_backend_get_non_master_fd(struct wlr_backend *backend);
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/**
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* Leases a given output to the caller. The output must be from the associated
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* DRM backend.
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