KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm-shim: implement stat/fstat when xstat variants are not there 

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 027095065d ("drm-shim: fix compile with glibc >= 2.33")
Acked-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12129>
This commit is contained in:
Lionel Landwerlin 2021-07-29 17:35:19 +03:00 committed by Marge Bot
parent 5cee8434fd
commit f86faee9f4
1 changed files with 115 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
src/drm-shim/drm_shim.c
View File

@ -77,11 +77,18 @@ REAL_FUNCTION_POINTER(readdir64);
REAL_FUNCTION_POINTER(readlink);
REAL_FUNCTION_POINTER(realpath);
#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 33
#define HAS_XSTAT __GLIBC__ == 2 && __GLIBC_MINOR__ < 33
#if HAS_XSTAT
REAL_FUNCTION_POINTER(__xstat);
REAL_FUNCTION_POINTER(__xstat64);
REAL_FUNCTION_POINTER(__fxstat);
REAL_FUNCTION_POINTER(__fxstat64);
#else
REAL_FUNCTION_POINTER(stat);
REAL_FUNCTION_POINTER(stat64);
REAL_FUNCTION_POINTER(fstat);
REAL_FUNCTION_POINTER(fstat64);
#endif
/* Full path of /dev/dri/renderD* */
@ -209,11 +216,16 @@ init_shim(void)
GET_FUNCTION_POINTER(readlink);
GET_FUNCTION_POINTER(realpath);
#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 33
#if HAS_XSTAT
GET_FUNCTION_POINTER(__xstat);
GET_FUNCTION_POINTER(__xstat64);
GET_FUNCTION_POINTER(__fxstat);
GET_FUNCTION_POINTER(__fxstat64);
#else
GET_FUNCTION_POINTER(stat);
GET_FUNCTION_POINTER(stat64);
GET_FUNCTION_POINTER(fstat);
GET_FUNCTION_POINTER(fstat64);
#endif
get_dri_render_node_minor();
@ -278,7 +290,7 @@ PUBLIC int open(const char *path, int flags, ...)
}
PUBLIC int open64(const char*, int, ...) __attribute__((alias("open")));
#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 33
#if HAS_XSTAT
/* Fakes stat to return character device stuff for our fake render node. */
PUBLIC int __xstat(int ver, const char *path, struct stat *st)
{
@ -379,6 +391,106 @@ PUBLIC int __fxstat64(int ver, int fd, struct stat64 *st)
return 0;
}
#else
PUBLIC int stat(const char* path, struct stat* stat_buf)
{
init_shim();
/* Note: call real stat if we're in the process of probing for a free
* render node!
*/
if (render_node_minor == -1)
return real_stat(path, stat_buf);
/* Fool libdrm's probe of whether the /sys dir for this char dev is
* there.
*/
char *sys_dev_drm_dir;
nfasprintf(&sys_dev_drm_dir,
"/sys/dev/char/%d:%d/device/drm",
DRM_MAJOR, render_node_minor);
if (strcmp(path, sys_dev_drm_dir) == 0) {
free(sys_dev_drm_dir);
return 0;
}
free(sys_dev_drm_dir);
if (strcmp(path, render_node_path) != 0)
return real_stat(path, stat_buf);
memset(stat_buf, 0, sizeof(*stat_buf));
stat_buf->st_rdev = makedev(DRM_MAJOR, render_node_minor);
stat_buf->st_mode = S_IFCHR;
return 0;
}
PUBLIC int stat64(const char* path, struct stat64* stat_buf)
{
init_shim();
/* Note: call real stat if we're in the process of probing for a free
* render node!
*/
if (render_node_minor == -1)
return real_stat64(path, stat_buf);
/* Fool libdrm's probe of whether the /sys dir for this char dev is
* there.
*/
char *sys_dev_drm_dir;
nfasprintf(&sys_dev_drm_dir,
"/sys/dev/char/%d:%d/device/drm",
DRM_MAJOR, render_node_minor);
if (strcmp(path, sys_dev_drm_dir) == 0) {
free(sys_dev_drm_dir);
return 0;
}
free(sys_dev_drm_dir);
if (strcmp(path, render_node_path) != 0)
return real_stat64(path, stat_buf);
memset(stat_buf, 0, sizeof(*stat_buf));
stat_buf->st_rdev = makedev(DRM_MAJOR, render_node_minor);
stat_buf->st_mode = S_IFCHR;
return 0;
}
PUBLIC int fstat(int fd, struct stat* stat_buf)
{
init_shim();
struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
if (!shim_fd)
return real_fstat(fd, stat_buf);
memset(stat_buf, 0, sizeof(*stat_buf));
stat_buf->st_rdev = makedev(DRM_MAJOR, render_node_minor);
stat_buf->st_mode = S_IFCHR;
return 0;
}
PUBLIC int fstat64(int fd, struct stat64* stat_buf)
{
init_shim();
struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
if (!shim_fd)
return real_fstat64(fd, stat_buf);
memset(stat_buf, 0, sizeof(*stat_buf));
stat_buf->st_rdev = makedev(DRM_MAJOR, render_node_minor);
stat_buf->st_mode = S_IFCHR;
return 0;
}
#endif
/* Tracks if the opendir was on /dev/dri. */