diff options
Diffstat (limited to 'src/shared/memfd-util.c')
-rw-r--r-- | src/shared/memfd-util.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/src/shared/memfd-util.c b/src/shared/memfd-util.c deleted file mode 100644 index e99a738e1f..0000000000 --- a/src/shared/memfd-util.c +++ /dev/null @@ -1,171 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2013 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <stdio.h> -#include <fcntl.h> -#include <sys/mman.h> -#include <sys/prctl.h> - -#ifdef HAVE_LINUX_MEMFD_H -# include <linux/memfd.h> -#endif - -#include "util.h" -#include "memfd-util.h" -#include "utf8.h" -#include "missing.h" - -int memfd_new(const char *name) { - _cleanup_free_ char *g = NULL; - int fd; - - if (!name) { - char pr[17] = {}; - - /* If no name is specified we generate one. We include - * a hint indicating our library implementation, and - * add the thread name to it */ - - assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); - - if (isempty(pr)) - name = "sd"; - else { - _cleanup_free_ char *e = NULL; - - e = utf8_escape_invalid(pr); - if (!e) - return -ENOMEM; - - g = strappend("sd-", e); - if (!g) - return -ENOMEM; - - name = g; - } - } - - fd = memfd_create(name, MFD_ALLOW_SEALING | MFD_CLOEXEC); - if (fd < 0) - return -errno; - - return fd; -} - -int memfd_map(int fd, uint64_t offset, size_t size, void **p) { - void *q; - int sealed; - - assert(fd >= 0); - assert(size > 0); - assert(p); - - sealed = memfd_get_sealed(fd); - if (sealed < 0) - return sealed; - - if (sealed) - q = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, offset); - else - q = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset); - - if (q == MAP_FAILED) - return -errno; - - *p = q; - return 0; -} - -int memfd_set_sealed(int fd) { - int r; - - assert(fd >= 0); - - r = fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL); - if (r < 0) - return -errno; - - return 0; -} - -int memfd_get_sealed(int fd) { - int r; - - assert(fd >= 0); - - r = fcntl(fd, F_GET_SEALS); - if (r < 0) - return -errno; - - return r == (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL); -} - -int memfd_get_size(int fd, uint64_t *sz) { - struct stat stat; - int r; - - assert(fd >= 0); - assert(sz); - - r = fstat(fd, &stat); - if (r < 0) - return -errno; - - *sz = stat.st_size; - return 0; -} - -int memfd_set_size(int fd, uint64_t sz) { - int r; - - assert(fd >= 0); - - r = ftruncate(fd, sz); - if (r < 0) - return -errno; - - return 0; -} - -int memfd_new_and_map(const char *name, size_t sz, void **p) { - _cleanup_close_ int fd = -1; - int r; - - assert(sz > 0); - assert(p); - - fd = memfd_new(name); - if (fd < 0) - return fd; - - r = memfd_set_size(fd, sz); - if (r < 0) - return r; - - r = memfd_map(fd, 0, sz, p); - if (r < 0) - return r; - - r = fd; - fd = -1; - - return r; -} |