qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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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 
     23 int 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 }