Signed-off-by: Chia-I Wu <olvaffe@gmail.com> Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org> Reviewed-by: Ryan Neph <ryanneph@google.com>macos/master
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/*
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* Copyright © 2012 Collabora, Ltd. |
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* |
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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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* |
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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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* |
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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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* SOFTWARE. |
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*/ |
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/*
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* Based on weston shared/os-compatibility.c |
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*/ |
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#ifndef _WIN32 |
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#include "anon_file.h" |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#if defined(HAVE_MEMFD_CREATE) || defined(__FreeBSD__) || defined(__OpenBSD__) |
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#include <sys/mman.h> |
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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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#else |
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#include <stdio.h> |
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#endif |
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#if !(defined(__FreeBSD__) || defined(HAVE_MEMFD_CREATE) || defined(HAVE_MKOSTEMP) || defined(ANDROID)) |
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static int |
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set_cloexec_or_close(int fd) |
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{ |
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long flags; |
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if (fd == -1) |
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return -1; |
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flags = fcntl(fd, F_GETFD); |
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if (flags == -1) |
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goto err; |
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if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) |
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goto err; |
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return fd; |
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err: |
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close(fd); |
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return -1; |
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} |
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#endif |
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#if !(defined(__FreeBSD__) || defined(HAVE_MEMFD_CREATE) || defined(ANDROID)) |
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static int |
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create_tmpfile_cloexec(char *tmpname) |
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{ |
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int fd; |
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#ifdef HAVE_MKOSTEMP |
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fd = mkostemp(tmpname, O_CLOEXEC); |
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#else |
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fd = mkstemp(tmpname); |
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#endif |
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if (fd < 0) { |
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return fd; |
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} |
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#ifndef HAVE_MKOSTEMP |
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fd = set_cloexec_or_close(fd); |
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#endif |
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unlink(tmpname); |
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return fd; |
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} |
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#endif |
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/*
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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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* |
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* An optional name for debugging can be provided as the second argument. |
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* |
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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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* |
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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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* |
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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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*/ |
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int |
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os_create_anonymous_file(off_t size, const char *debug_name) |
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{ |
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int fd, ret; |
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#if defined(HAVE_MEMFD_CREATE) |
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if (!debug_name) |
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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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if (!debug_name) |
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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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if (fd != -1) |
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shm_unlink(template); |
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#else |
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const char *path; |
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char *name; |
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path = getenv("XDG_RUNTIME_DIR"); |
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if (!path) { |
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errno = ENOENT; |
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return -1; |
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} |
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if (debug_name) |
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asprintf(&name, "%s/mesa-shared-%s-XXXXXX", path, debug_name); |
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else |
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asprintf(&name, "%s/mesa-shared-XXXXXX", path); |
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if (!name) |
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return -1; |
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fd = create_tmpfile_cloexec(name); |
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free(name); |
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#endif |
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if (fd < 0) |
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return -1; |
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ret = ftruncate(fd, size); |
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if (ret < 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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#endif |
@ -0,0 +1,33 @@ |
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/*
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* Copyright © 2012 Collabora, Ltd. |
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* |
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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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* |
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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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* |
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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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* SOFTWARE. |
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*/ |
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#ifndef _ANON_FILE_H_ |
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#define _ANON_FILE_H_ |
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#include <sys/types.h> |
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int os_create_anonymous_file(off_t size, const char *debug_name); |
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#endif |
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