LXR qemu/util/drm.c

   1/*
   2 * Copyright (C) 2015-2016 Gerd Hoffmann <kraxel@redhat.com>
   3 *
   4 * This library is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU Lesser General Public
   6 * License as published by the Free Software Foundation; either
   7 * version 2.1 of the License, or (at your option) any later version.
   8 *
   9 * This library is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 * Lesser General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU Lesser General Public
  15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17#include "qemu/osdep.h"
  18#include "qemu/drm.h"
  19
  20#include <glob.h>
  21#include <dirent.h>
  22
  23int qemu_drm_rendernode_open(const char *rendernode)
  24{
  25    DIR *dir;
  26    struct dirent *e;
  27    int r, fd;
  28    char *p;
  29
  30    if (rendernode) {
  31        return open(rendernode, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  32    }
  33
  34    dir = opendir("/dev/dri");
  35    if (!dir) {
  36        return -1;
  37    }
  38
  39    fd = -1;
  40    while ((e = readdir(dir))) {
  41        if (e->d_type != DT_CHR) {
  42            continue;
  43        }
  44
  45        if (strncmp(e->d_name, "renderD", 7)) {
  46            continue;
  47        }
  48
  49        p = g_strdup_printf("/dev/dri/%s", e->d_name);
  50
  51        r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  52        if (r < 0) {
  53            g_free(p);
  54            continue;
  55        }
  56        fd = r;
  57        g_free(p);
  58        break;
  59    }
  60
  61    closedir(dir);
  62    if (fd < 0) {
  63        return -1;
  64    }
  65    return fd;
  66}
  67