1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2013 Lennart Poettering
12 #if HAVE_LINUX_MEMFD_H
13 #include <linux/memfd.h>
17 #include <sys/prctl.h>
19 #include "alloc-util.h"
22 #include "memfd-util.h"
24 #include "string-util.h"
27 int memfd_new(const char *name) {
28 _cleanup_free_ char *g = NULL;
34 /* If no name is specified we generate one. We include
35 * a hint indicating our library implementation, and
36 * add the thread name to it */
38 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
43 _cleanup_free_ char *e = NULL;
45 e = utf8_escape_invalid(pr);
49 g = strappend("sd-", e);
57 fd = memfd_create(name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
64 #if 0 /// UNNEEDED by elogind
65 int memfd_map(int fd, uint64_t offset, size_t size, void **p) {
73 sealed = memfd_get_sealed(fd);
78 q = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, offset);
80 q = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
90 int memfd_set_sealed(int fd) {
95 r = fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL);
102 #if 0 /// UNNEEDED by elogind
103 int memfd_get_sealed(int fd) {
108 r = fcntl(fd, F_GET_SEALS);
112 return r == (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL);
116 int memfd_get_size(int fd, uint64_t *sz) {
123 r = fstat(fd, &stat);
131 int memfd_set_size(int fd, uint64_t sz) {
136 r = ftruncate(fd, sz);
143 #if 0 /// UNNEEDED by elogind
144 int memfd_new_and_map(const char *name, size_t sz, void **p) {
145 _cleanup_close_ int fd = -1;
151 fd = memfd_new(name);
155 r = memfd_set_size(fd, sz);
159 r = memfd_map(fd, 0, sz, p);