wip: fork

1 files changed, 0 insertions, 198 deletions

diff --git a/libdecor/src/os-compatibility.c b/libdecor/src/os-compatibility.c
deleted file mode 100644
index 23766473d..000000000
--- a/libdecor/src/os-compatibility.c
+++ /dev/null
@@ -1,198 +0,0 @@
-/*
- * Copyright © 2012 Collabora, Ltd.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial
- * portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include "config.h"
-
-#include <sys/types.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <signal.h>
-#include <string.h>
-#include <stdlib.h>
-
-#ifdef HAVE_MEMFD_CREATE
-#include <sys/mman.h>
-#endif
-
-#include "os-compatibility.h"
-
-#ifndef HAVE_MKOSTEMP
-static int
-set_cloexec_or_close(int fd)
-{
-	long flags;
-
-	if (fd == -1)
-		return -1;
-
-	flags = fcntl(fd, F_GETFD);
-	if (flags == -1)
-		goto err;
-
-	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
-		goto err;
-
-	return fd;
-
-err:
-	close(fd);
-	return -1;
-}
-#endif
-
-static int
-create_tmpfile_cloexec(char *tmpname)
-{
-	int fd;
-
-#ifdef HAVE_MKOSTEMP
-	fd = mkostemp(tmpname, O_CLOEXEC);
-	if (fd >= 0)
-		unlink(tmpname);
-#else
-	fd = mkstemp(tmpname);
-	if (fd >= 0) {
-		fd = set_cloexec_or_close(fd);
-		unlink(tmpname);
-	}
-#endif
-
-	return fd;
-}
-
-static int
-os_resize_anonymous_file(int fd, off_t size)
-{
-#ifdef HAVE_POSIX_FALLOCATE
-	sigset_t mask;
-	sigset_t old_mask;
-
-	/* posix_fallocate() might be interrupted, so we need to check
-	 * for EINTR and retry in that case.
-	 * However, in the presence of an alarm, the interrupt may trigger
-	 * repeatedly and prevent a large posix_fallocate() to ever complete
-	 * successfully, so we need to first block SIGALRM to prevent
-	 * this.
-	 */
-	sigemptyset(&mask);
-	sigaddset(&mask, SIGALRM);
-	sigprocmask(SIG_BLOCK, &mask, &old_mask);
-	/* 
-	 * Filesystems that do not support fallocate will return EINVAL or
-	 * EOPNOTSUPP. In this case we need to fall back to ftruncate
-	 */
-	do {
-		errno = posix_fallocate(fd, 0, size);
-	} while (errno == EINTR);
-	sigprocmask(SIG_SETMASK, &old_mask, NULL);
-	if (errno == 0)
-		return 0;
-	else if (errno != EINVAL && errno != EOPNOTSUPP)
-		return -1;
-#endif
-	if (ftruncate(fd, size) < 0)
-		return -1;
-
-	return 0;
-}
-
-/*
- * Create a new, unique, anonymous file of the given size, and
- * return the file descriptor for it. The file descriptor is set
- * CLOEXEC. The file is immediately suitable for mmap()'ing
- * the given size at offset zero.
- *
- * The file should not have a permanent backing store like a disk,
- * but may have if XDG_RUNTIME_DIR is not properly implemented in OS.
- *
- * The file name is deleted from the file system.
- *
- * The file is suitable for buffer sharing between processes by
- * transmitting the file descriptor over Unix sockets using the
- * SCM_RIGHTS methods.
- *
- * If the C library implements posix_fallocate(), it is used to
- * guarantee that disk space is available for the file at the
- * given size. If disk space is insufficient, errno is set to ENOSPC.
- * If posix_fallocate() is not supported, program may receive
- * SIGBUS on accessing mmap()'ed file contents instead.
- *
- * If the C library implements memfd_create(), it is used to create the
- * file purely in memory, without any backing file name on the file
- * system, and then sealing off the possibility of shrinking it.  This
- * can then be checked before accessing mmap()'ed file contents, to
- * make sure SIGBUS can't happen.  It also avoids requiring
- * XDG_RUNTIME_DIR.
- */
-int
-libdecor_os_create_anonymous_file(off_t size)
-{
-	static const char template[] = "/libdecor-shared-XXXXXX";
-	const char *path;
-	char *name;
-	int fd;
-
-#ifdef HAVE_MEMFD_CREATE
-	fd = memfd_create("libdecor", MFD_CLOEXEC | MFD_ALLOW_SEALING);
-	if (fd >= 0) {
-		/* We can add this seal before calling posix_fallocate(), as
-		 * the file is currently zero-sized anyway.
-		 *
-		 * There is also no need to check for the return value, we
-		 * couldn't do anything with it anyway.
-		 */
-		fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_SEAL);
-	} else
-#endif
-	{
-		path = getenv("XDG_RUNTIME_DIR");
-		if (!path) {
-			errno = ENOENT;
-			return -1;
-		}
-
-		name = malloc(strlen(path) + sizeof(template));
-		if (!name)
-			return -1;
-
-		strcpy(name, path);
-		strcat(name, template);
-
-		fd = create_tmpfile_cloexec(name);
-
-		free(name);
-
-		if (fd < 0)
-			return -1;
-	}
-
-	if (os_resize_anonymous_file(fd, size) < 0) {
-		close(fd);
-		return -1;
-	}
-
-	return fd;
-}