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![Sebastian Wick](/assets/img/avatar_default.png)
The ro_anonymous_file is an abstraction around anonymous read-only files.
os_ro_anonymous_file_create creates such a file with the contents passed
in data. Subsequent calls to os_ro_anonymous_file_get_fd return a fd
that's ready to be send over the socket.
When mapmode is RO_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. RO_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.
See also:
weston commit 76829fc4ea
wayland commit 905c0a341ddf0a885811d19e2b79c65a3f1d210c
Signed-off-by: Sebastian Wick <sebastian@sebastianwick.net>
75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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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 OS_COMPATIBILITY_H
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#define OS_COMPATIBILITY_H
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#include "config.h"
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#include <sys/types.h>
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int
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os_fd_set_cloexec(int fd);
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int
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os_socketpair_cloexec(int domain, int type, int protocol, int *sv);
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int
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os_epoll_create_cloexec(void);
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int
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os_create_anonymous_file(off_t size);
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#ifndef HAVE_STRCHRNUL
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char *
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strchrnul(const char *s, int c);
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#endif
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struct ro_anonymous_file;
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enum ro_anonymous_file_mapmode {
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RO_ANONYMOUS_FILE_MAPMODE_PRIVATE,
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RO_ANONYMOUS_FILE_MAPMODE_SHARED,
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};
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struct ro_anonymous_file *
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os_ro_anonymous_file_create(size_t size,
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const char *data);
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void
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os_ro_anonymous_file_destroy(struct ro_anonymous_file *file);
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size_t
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os_ro_anonymous_file_size(struct ro_anonymous_file *file);
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int
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os_ro_anonymous_file_get_fd(struct ro_anonymous_file *file,
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enum ro_anonymous_file_mapmode mapmode);
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int
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os_ro_anonymous_file_put_fd(int fd);
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#endif /* OS_COMPATIBILITY_H */
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