1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright 2013 Lennart Poettering
10 #if HAVE_LINUX_MEMFD_H
11 #include <linux/memfd.h>
15 #include <sys/prctl.h>
17 #include "alloc-util.h"
20 #include "memfd-util.h"
22 #include "string-util.h"
25 int memfd_new(const char *name) {
26 _cleanup_free_ char *g = NULL;
32 /* If no name is specified we generate one. We include
33 * a hint indicating our library implementation, and
34 * add the thread name to it */
36 assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
41 _cleanup_free_ char *e = NULL;
43 e = utf8_escape_invalid(pr);
47 g = strappend("sd-", e);
55 fd = memfd_create(name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
62 #if 0 /// UNNEEDED by elogind
63 int memfd_map(int fd, uint64_t offset, size_t size, void **p) {
71 sealed = memfd_get_sealed(fd);
76 q = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, offset);
78 q = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
88 int memfd_set_sealed(int fd) {
93 r = fcntl(fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL);
100 #if 0 /// UNNEEDED by elogind
101 int memfd_get_sealed(int fd) {
106 r = fcntl(fd, F_GET_SEALS);
110 return r == (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_SEAL);
114 int memfd_get_size(int fd, uint64_t *sz) {
121 r = fstat(fd, &stat);
129 int memfd_set_size(int fd, uint64_t sz) {
134 r = ftruncate(fd, sz);
141 #if 0 /// UNNEEDED by elogind
142 int memfd_new_and_map(const char *name, size_t sz, void **p) {
143 _cleanup_close_ int fd = -1;
149 fd = memfd_new(name);
153 r = memfd_set_size(fd, sz);
157 r = memfd_map(fd, 0, sz, p);