src/libsystemd/sd-bus/bus-kernel.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #if HAVE_VALGRIND_MEMCHECK_H
   4 #include <valgrind/memcheck.h>
   5 #endif
   6
   7 #include <fcntl.h>
   8 #include <malloc.h>
   9 #include <sys/mman.h>
  10 #include <sys/prctl.h>
  11
  12 /* When we include libgen.h because we need dirname() we immediately
  13  * undefine basename() since libgen.h defines it as a macro to the POSIX
  14  * version which is really broken. We prefer GNU basename(). */
  15 #include <libgen.h>
  16 #undef basename
  17
  18 #include "alloc-util.h"
  19 #include "bus-internal.h"
  20 #include "bus-kernel.h"
  21 #include "bus-label.h"
  22 #include "bus-message.h"
  23 #include "bus-util.h"
  24 #include "capability-util.h"
  25 #include "fd-util.h"
  26 #include "fileio.h"
  27 #include "format-util.h"
  28 #include "memfd-util.h"
  29 #include "parse-util.h"
  30 #include "stdio-util.h"
  31 #include "string-util.h"
  32 #include "strv.h"
  33 #include "user-util.h"
  34 #include "memory-util.h"
  35
  36 void close_and_munmap(int fd, void *address, size_t size) {
  37         if (size > 0)
  38                 assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
  39
  40         safe_close(fd);
  41 }
  42
  43 void bus_flush_memfd(sd_bus *b) {
  44         unsigned i;
  45
  46         assert(b);
  47
  48         for (i = 0; i < b->n_memfd_cache; i++)
  49                 close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
  50 }