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author | Jonathan Gray | 2016-12-16 23:09:52 -0600 |
---|---|---|
committer | Emil Velikov | 2016-12-24 11:06:53 -0600 |
commit | e2e766d5acdbb826f1cfe5643669db54ee86f456 (patch) | |
tree | 7508331243098b57fafcee55e79813cd60a7677e /xf86drm.c | |
parent | d5cf3f98314c1b9d87216e00c30c9fef06ff24c3 (diff) | |
download | external-libdrm-e2e766d5acdbb826f1cfe5643669db54ee86f456.tar.gz external-libdrm-e2e766d5acdbb826f1cfe5643669db54ee86f456.tar.xz external-libdrm-e2e766d5acdbb826f1cfe5643669db54ee86f456.zip |
xf86drm: add a non-sysfs version of drmGetDeviceNameFromFd2
Implement a generic drmGetDeviceNameFromFd2() to use on non-linux
systems without sysfs.
v2: remove min < base test as requested by Emil
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Diffstat (limited to 'xf86drm.c')
-rw-r--r-- | xf86drm.c | 44 |
1 files changed, 42 insertions, 2 deletions
@@ -3627,7 +3627,47 @@ char *drmGetDeviceNameFromFd2(int fd) | |||
3627 | fclose(f); | 3627 | fclose(f); |
3628 | return device_name; | 3628 | return device_name; |
3629 | #else | 3629 | #else |
3630 | #warning "Missing implementation of drmGetDeviceNameFromFd2" | 3630 | struct stat sbuf; |
3631 | return NULL; | 3631 | char node[PATH_MAX + 1]; |
3632 | const char *dev_name; | ||
3633 | int node_type; | ||
3634 | int maj, min, n, base; | ||
3635 | |||
3636 | if (fstat(fd, &sbuf)) | ||
3637 | return NULL; | ||
3638 | |||
3639 | maj = major(sbuf.st_rdev); | ||
3640 | min = minor(sbuf.st_rdev); | ||
3641 | |||
3642 | if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode)) | ||
3643 | return NULL; | ||
3644 | |||
3645 | node_type = drmGetMinorType(min); | ||
3646 | if (node_type == -1) | ||
3647 | return NULL; | ||
3648 | |||
3649 | switch (node_type) { | ||
3650 | case DRM_NODE_PRIMARY: | ||
3651 | dev_name = DRM_DEV_NAME; | ||
3652 | break; | ||
3653 | case DRM_NODE_CONTROL: | ||
3654 | dev_name = DRM_CONTROL_DEV_NAME; | ||
3655 | break; | ||
3656 | case DRM_NODE_RENDER: | ||
3657 | dev_name = DRM_RENDER_DEV_NAME; | ||
3658 | break; | ||
3659 | default: | ||
3660 | return NULL; | ||
3661 | }; | ||
3662 | |||
3663 | base = drmGetMinorBase(node_type); | ||
3664 | if (base < 0) | ||
3665 | return NULL; | ||
3666 | |||
3667 | n = snprintf(node, PATH_MAX, dev_name, DRM_DIR_NAME, min - base); | ||
3668 | if (n == -1 || n >= PATH_MAX) | ||
3669 | return NULL; | ||
3670 | |||
3671 | return strdup(node); | ||
3632 | #endif | 3672 | #endif |
3633 | } | 3673 | } |