cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

drm.c (1894B)

      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}