diff options
Diffstat (limited to 'util/os-compatibility.c')
-rw-r--r-- | util/os-compatibility.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/util/os-compatibility.c b/util/os-compatibility.c deleted file mode 100644 index bd39705d..00000000 --- a/util/os-compatibility.c +++ /dev/null @@ -1,149 +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. - */ - -#define _POSIX_C_SOURCE 200809L -#include <errno.h> -#include <fcntl.h> -#include <stdlib.h> -#include <string.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> -#include <wlr/config.h> -#include "util/os-compatibility.h" - -int os_fd_set_cloexec(int fd) { - if (fd == -1) { - return -1; - } - - long flags = fcntl(fd, F_GETFD); - if (flags == -1) { - return -1; - } - - if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) { - return -1; - } - - return 0; -} - -int set_cloexec_or_close(int fd) { - if (os_fd_set_cloexec(fd) != 0) { - close(fd); - return -1; - } - return fd; -} - -int create_tmpfile_cloexec(char *tmpname) { - int fd; - mode_t prev_umask = umask(0066); -#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 - umask(prev_umask); - - return fd; -} - -/* - * 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. - */ -int os_create_anonymous_file(off_t size) { - static const char template[] = "/wlroots-shared-XXXXXX"; - - const char *path = getenv("XDG_RUNTIME_DIR"); - if (!path) { - errno = ENOENT; - return -1; - } - - char *name = malloc(strlen(path) + sizeof(template)); - if (!name) { - return -1; - } - - strcpy(name, path); - strcat(name, template); - - int fd = create_tmpfile_cloexec(name); - free(name); - if (fd < 0) { - return -1; - } - -#ifdef WLR_HAS_POSIX_FALLOCATE - int ret; - do { - ret = posix_fallocate(fd, 0, size); - } while (ret == EINTR); - if (ret != 0) { - close(fd); - errno = ret; - return -1; - } -#else - int ret; - do { - ret = ftruncate(fd, size); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - close(fd); - return -1; - } -#endif - - return fd; -} |