129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
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/*
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* Copyright © 2012 Collabora, Ltd.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#define _GNU_SOURCE
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#include <sys/types.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 <string.h>
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#include <stdlib.h>
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#include "config.h"
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#include "os-compatibility.h"
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#ifndef HAVE_MKOSTEMP
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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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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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if (fd >= 0)
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unlink(tmpname);
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#else
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fd = mkstemp(tmpname);
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if (fd >= 0) {
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fd = set_cloexec_or_close(fd);
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unlink(tmpname);
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}
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#endif
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return fd;
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}
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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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* 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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* 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)
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{
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static const char template[] = "/weston-shared-XXXXXX";
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const char *path;
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char *name;
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int fd;
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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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name = malloc(strlen(path) + sizeof(template));
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if (!name)
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return -1;
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strcpy(name, path);
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strcat(name, template);
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fd = create_tmpfile_cloexec(name);
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free(name);
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if (fd < 0)
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return -1;
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if (ftruncate(fd, size) < 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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