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