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/*
* Copyright © 2012 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* Based on weston shared/os-compatibility.c
*/
#ifndef WIN32
#include "anon_file.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#ifdef __FreeBSD__
#include <sys/mman.h>
#elif defined(HAVE_MEMFD_CREATE)
#include <sys/syscall.h>
#include <linux/memfd.h>
#else
#include <stdio.h>
#include <stdlib.h>
#endif
#if !(defined(__FreeBSD__) || defined(HAVE_MEMFD_CREATE) || defined(HAVE_MKOSTEMP))
static int
set_cloexec_or_close(int fd)
{
long flags;
if (fd == -1)
return -1;
flags = fcntl(fd, F_GETFD);
if (flags == -1)
goto err;
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
goto err;
return fd;
err:
close(fd);
return -1;
}
#endif
#if !(defined(__FreeBSD__) || defined(HAVE_MEMFD_CREATE))
static int
create_tmpfile_cloexec(char *tmpname)
{
int fd;
#ifdef HAVE_MKOSTEMP
fd = mkostemp(tmpname, O_CLOEXEC);
#else
fd = mkstemp(tmpname);
#endif
if (fd < 0) {
return fd;
}
#ifndef HAVE_MKOSTEMP
fd = set_cloexec_or_close(fd);
#endif
unlink(tmpname);
return fd;
}
#endif
/*
* Create a new, unique, anonymous file of the given size, and
* return the file descriptor for it. The file descriptor is set
* CLOEXEC. The file is immediately suitable for mmap()'ing
* the given size at offset zero.
*
* An optional name for debugging can be provided as the second argument.
*
* The file should not have a permanent backing store like a disk,
* but may have if XDG_RUNTIME_DIR is not properly implemented in OS.
*
* If memfd or SHM_ANON is supported, the filesystem is not touched at all.
* Otherwise, the file name is deleted from the file system.
*
* The file is suitable for buffer sharing between processes by
* transmitting the file descriptor over Unix sockets using the
* SCM_RIGHTS methods.
*/
int
os_create_anonymous_file(off_t size, const char *debug_name)
{
int fd, ret;
#ifdef __FreeBSD__
(void*)debug_name;
fd = shm_open(SHM_ANON, O_CREAT | O_RDWR | O_CLOEXEC, 0600);
#elif defined(HAVE_MEMFD_CREATE)
if (!debug_name)
debug_name = "mesa-shared";
fd = syscall(SYS_memfd_create, debug_name, MFD_CLOEXEC);
#else
const char *path;
char *name;
path = getenv("XDG_RUNTIME_DIR");
if (!path) {
errno = ENOENT;
return -1;
}
if (debug_name)
asprintf(&name, "%s/mesa-shared-%s-XXXXXX", path, debug_name);
else
asprintf(&name, "%s/mesa-shared-XXXXXX", path);
if (!name)
return -1;
fd = create_tmpfile_cloexec(name);
free(name);
#endif
if (fd < 0)
return -1;
ret = ftruncate(fd, size);
if (ret < 0) {
close(fd);
return -1;
}
return fd;
}
#endif
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