From 47f5a6a460172c805e98b2f2da08fb154318e430 Mon Sep 17 00:00:00 2001
From: Benjamin Franzke <benjaminfranzke@googlemail.com>
Date: Mon, 20 Jun 2011 19:13:27 +0200
Subject: change gbm_get_device back to gbm_create_device

additionally add _gbm_mesa_get_device.
---
 src/gbm/main/gbm.c    | 89 +++++++++++++++++++++++++++++----------------------
 src/gbm/main/gbm.h    |  2 +-
 src/gbm/main/gbmint.h |  7 ++--
 3 files changed, 56 insertions(+), 42 deletions(-)

diff --git a/src/gbm/main/gbm.c b/src/gbm/main/gbm.c
index 74010522de..6fab1c7362 100644
--- a/src/gbm/main/gbm.c
+++ b/src/gbm/main/gbm.c
@@ -25,14 +25,29 @@
  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  */
 
+#define _BSD_SOURCE
+
 #include <stddef.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <stdint.h>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "gbm.h"
 #include "gbmint.h"
+#include "common.h"
 #include "backend.h"
 
+#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
+
+struct gbm_device *devices[16];
+
+static int device_num = 0;
+
 GBM_EXPORT int
 gbm_device_get_fd(struct gbm_device *gbm)
 {
@@ -62,60 +77,56 @@ gbm_device_destroy(struct gbm_device *gbm)
       gbm->destroy(gbm);
 }
 
-static int device_space = 0;
-static int device_num = 0;
-static struct {
-   int fd;
-   struct gbm_device *gbm;
-} *devices = NULL;
-
 GBM_EXPORT struct gbm_device *
-gbm_get_device(int fd)
+_gbm_mesa_get_device(int fd)
 {
    struct gbm_device *gbm = NULL;
+   struct stat buf;
+   dev_t dev;
    int i;
 
-   if (fd < 0)
+   if (fd < 0 || fstat(fd, &buf) < 0 || !S_ISCHR(buf.st_mode)) {
+      fprintf(stderr, "_gbm_mesa_get_device: invalid fd: %d\n", fd);
       return NULL;
+   }
 
-   if (devices == NULL) {
-      device_space = 2;
-      devices = calloc(device_space, sizeof *devices);
-      for (i = 0; i < device_space; ++i)
-         devices[i].fd = -1;
-
-      if (devices == NULL)
-         return NULL;
+   for (i = 0; i < device_num; ++i) {
+      dev = devices[i]->stat.st_rdev;
+      if (major(dev) == major(buf.st_rdev) &&
+          minor(dev) == minor(buf.st_rdev)) {
+         gbm = devices[i];
+         gbm->refcount++;
+         break;
+      }
    }
 
-   for (i = 0; i < device_num; ++i)
-      if (devices[i].fd == fd)
-         gbm = devices[i].gbm;
+   return gbm;
+}
 
-   if (gbm == NULL) {
-      gbm = _gbm_create_device(fd);
-      if (gbm == NULL)
-         return NULL;
+GBM_EXPORT struct gbm_device *
+gbm_create_device(int fd)
+{
+   struct gbm_device *gbm = NULL;
+   struct stat buf;
 
-      gbm->dummy = gbm_get_device;
-      gbm->refcount = 0;
+   if (fd < 0 || fstat(fd, &buf) < 0 || !S_ISCHR(buf.st_mode)) {
+      fprintf(stderr, "gbm_create_device: invalid fd: %d\n", fd);
+      return NULL;
+   }
 
-      if (device_num == device_space) {
-         device_space *= 2;
-         devices = realloc(devices, device_space);
-         if (devices == NULL)
-            return NULL;
+   if (device_num == 0)
+      memset(devices, 0, sizeof devices);
 
-         for (i = device_num; i < device_space; ++i)
-            devices[i].fd = -1;
-      }
+   gbm = _gbm_create_device(fd);
+   if (gbm == NULL)
+      return NULL;
 
-      devices[device_num].fd = fd;
-      devices[device_num].gbm = gbm;
-      device_num++;
-   }
+   gbm->dummy = gbm_create_device;
+   gbm->stat = buf;
+   gbm->refcount = 1;
 
-   gbm->refcount++;
+   if (device_num < ARRAY_SIZE(devices)-1)
+      devices[device_num++] = gbm;
 
    return gbm;
 }
diff --git a/src/gbm/main/gbm.h b/src/gbm/main/gbm.h
index 759ee52d1e..08d1b67a14 100644
--- a/src/gbm/main/gbm.h
+++ b/src/gbm/main/gbm.h
@@ -69,7 +69,7 @@ void
 gbm_device_destroy(struct gbm_device *gbm);
 
 struct gbm_device *
-gbm_get_device(int fd);
+gbm_create_device(int fd);
 
 struct gbm_bo *
 gbm_bo_create(struct gbm_device *gbm,
diff --git a/src/gbm/main/gbmint.h b/src/gbm/main/gbmint.h
index 443c55a68b..423ac864f4 100644
--- a/src/gbm/main/gbmint.h
+++ b/src/gbm/main/gbmint.h
@@ -29,6 +29,7 @@
 #define INTERNAL_H_
 
 #include "gbm.h"
+#include <sys/stat.h>
 
 /* GCC visibility */
 #if defined(__GNUC__) && __GNUC__ >= 4
@@ -44,6 +45,7 @@ struct gbm_device {
    int fd;
    const char *name;
    unsigned int refcount;
+   struct stat stat;
 
    void (*destroy)(struct gbm_device *gbm);
    int (*is_format_supported)(struct gbm_device *gbm,
@@ -54,11 +56,9 @@ struct gbm_device {
                                 uint32_t width, uint32_t height,
                                 enum gbm_bo_format format,
                                 uint32_t usage);
-
    struct gbm_bo *(*bo_create_from_egl_image)(struct gbm_device *gbm,
                                               void *egl_dpy, void *egl_img,
                                               uint32_t width, uint32_t height);
-
    void (*bo_destroy)(struct gbm_bo *bo);
 };
 
@@ -75,4 +75,7 @@ struct gbm_backend {
    struct gbm_device *(*create_device)(int fd);
 };
 
+GBM_EXPORT struct gbm_device *
+_gbm_mesa_get_device(int fd);
+
 #endif
-- 
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