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    struct stat st;
  28    int r, fd, ret;
  29    char *p;
  30
  31    if (rendernode) {
  32        return open(rendernode, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  33    }
  34
  35    dir = opendir("/dev/dri");
  36    if (!dir) {
  37        return -1;
  38    }
  39
  40    fd = -1;
  41    while ((e = readdir(dir))) {
  42        if (strncmp(e->d_name, "renderD", 7)) {
  43            continue;
  44        }
  45
  46        p = g_strdup_printf("/dev/dri/%s", e->d_name);
  47
  48        r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
  49        if (r < 0) {
  50            g_free(p);
  51            continue;
  52        }
  53
  54        /*
  55         * prefer fstat() over checking e->d_type == DT_CHR for
  56         * portability reasons
  57         */
  58        ret = fstat(r, &st);
  59        if (ret < 0 || (st.st_mode & S_IFMT) != S_IFCHR) {
  60            close(r);
  61            g_free(p);
  62            continue;
  63        }
  64
  65        fd = r;
  66        g_free(p);
  67        break;
  68    }
  69
  70    closedir(dir);
  71    if (fd < 0) {
  72        return -1;
  73    }
  74    return fd;
  75}
  76