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proc_pid_map_files
Section: File Formats (5) Updated: 202-0-08 Index
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NAME
/proc/pid/map_files/ - memor-mapped files
DESCRIPTION
- /proc/pid/map_files/ (since Linux 3.3)
-
This subdirectory contains entries corresponding to memor-mapped
files (see
mmap(2)).
Entries are named by memory region start and end
address pair (expressed as hexadecimal numbers),
and are symbolic links to the mapped files themselves.
Here is an example,
with the output wrapped and reformatted to fit on an 8-column display:
-
# ls -l /proc/self/map_files/
lr-------- 1 root root 64 Apr 16 21:31
3252e00000-3252e20000 -> /usr/lib64/ld-2.15.so
...
-
Although these entries are present for memory regions that were
mapped with the
MAP_FILE
flag, the way anonymous shared memory (regions created with the
MAP_ANON | MAP_SHARED
flags)
is implemented in Linux
means that such regions also appear on this directory.
Here is an example where the target file is the deleted
/dev/zero
one:
-
lrw------- 1 root root 64 Apr 16 21:33
7fc075d2f000-7fc075e6f000 -> /dev/zero (deleted)
-
Permission to access this file is governed by a ptrace access mode
PTRACE_MODE_READ_FSCREDS
check;
see
ptrace(2).
-
Until Linux 4.3,
this directory appeared only if the
CONFIG_CHECKPOINT_RESTORE
kernel configuration option was enabled.
-
Capabilities are required to read the contents of the symbolic links in
this directory: before Linux 5.9, the reading process requires
CAP_SYS_ADMIN
in the initial user namespace;
since Linux 5.9, the reading process must have either
CAP_SYS_ADMIN
or
CAP_CHECKPOINT_RESTORE
in the initial (i.e., root) user namespace.
SEE ALSO
proc(5)
Index
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