76 lines
1.7 KiB
C++
76 lines
1.7 KiB
C++
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/*
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Crafter®.Graphics
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Copyright (C) 2025 Catcrafts®
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catcrafts.net
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 3.0 as published by the Free Software Foundation;
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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module;
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <time.h>
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module Crafter.Graphics:Shm_impl;
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import :Shm;
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import std;
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using namespace Crafter;
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void Crafter::randname(char *buf) {
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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long r = ts.tv_nsec;
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for (int i = 0; i < 6; ++i) {
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buf[i] = 'A'+(r&15)+(r&16)*2;
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r >>= 5;
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}
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}
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int Crafter::anonymous_shm_open(void) {
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char name[] = "/hello-wayland-XXXXXX";
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int retries = 100;
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do {
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randname(name + strlen(name) - 6);
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--retries;
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// shm_open guarantees that O_CLOEXEC is set
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int fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
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if (fd >= 0) {
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shm_unlink(name);
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return fd;
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}
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} while (retries > 0 && errno == EEXIST);
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return -1;
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}
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int Crafter::create_shm_file(off_t size) {
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int fd = anonymous_shm_open();
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if (fd < 0) {
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return fd;
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}
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if (ftruncate(fd, size) < 0) {
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close(fd);
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return -1;
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}
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return fd;
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}
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