551a57ed7f
Add MetaAnonymousFile, an abstraction around anonymous read-only files. Files can be created by calling meta_anonymous_file_new(), passing the data of the file. Subsequent calls to meta_anonymous_file_open_fd() return a fd that's ready to be sent over the socket. When mapmode is META_ANONYMOUS_FILE_MAPMODE_PRIVATE the fd is only guaranteed to be mmap-able readonly with MAP_PRIVATE but does not require duplicating the file for each resource when memfd_create is available. META_ANONYMOUS_FILE_MAPMODE_SHARED may be used when the client must be able to map the file with MAP_SHARED but it also means that the file has to be duplicated even when memfd_create is available. Pretty much all of this code was written for weston by Sebastian Wick, see https://gitlab.freedesktop.org/wayland/weston/merge_requests/240. Co-authored-by: Sebastian Wick <sebastian@sebastianwick.net> https://gitlab.gnome.org/GNOME/mutter/merge_requests/1012
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/*
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* Copyright (C) 2020 Sebastian Wick
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* Author: Sebastian Wick <sebastian@sebastianwick.net>
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*/
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#ifndef META_ANONYMOUS_FILE_H
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#define META_ANONYMOUS_FILE_H
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#include "meta/common.h"
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#include "core/util-private.h"
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typedef struct _MetaAnonymousFile MetaAnonymousFile;
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typedef enum _MetaAnonymousFileMapmode
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{
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META_ANONYMOUS_FILE_MAPMODE_PRIVATE,
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META_ANONYMOUS_FILE_MAPMODE_SHARED,
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} MetaAnonymousFileMapmode;
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META_EXPORT_TEST
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MetaAnonymousFile * meta_anonymous_file_new (size_t size,
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const uint8_t *data);
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META_EXPORT_TEST
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void meta_anonymous_file_free (MetaAnonymousFile *file);
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META_EXPORT_TEST
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size_t meta_anonymous_file_size (MetaAnonymousFile *file);
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META_EXPORT_TEST
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int meta_anonymous_file_open_fd (MetaAnonymousFile *file,
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MetaAnonymousFileMapmode mapmode);
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META_EXPORT_TEST
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void meta_anonymous_file_close_fd (int fd);
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#endif /* META_ANONYMOUS_FILE_H */
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