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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man5/proc_pid_maps.5
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man5/proc_pid_maps.5')
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-.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com>
-.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org>
-.\"
-.\" SPDX-License-Identifier: GPL-3.0-or-later
-.\"
-.TH proc_pid_maps 5 2023-09-07 "Linux man-pages 6.7"
-.SH NAME
-/proc/pid/maps \- mapped memory regions
-.SH DESCRIPTION
-.TP
-.IR /proc/ pid /maps
-A file containing the currently mapped memory regions and their access
-permissions.
-See
-.BR mmap (2)
-for some further information about memory mappings.
-.IP
-Permission to access this file is governed by a ptrace access mode
-.B PTRACE_MODE_READ_FSCREDS
-check; see
-.BR ptrace (2).
-.IP
-The format of the file is:
-.IP
-.in +4n
-.EX
-.I "address perms offset dev inode pathname"
-00400000\-00452000 r\-xp 00000000 08:02 173521 /usr/bin/dbus\-daemon
-00651000\-00652000 r\-\-p 00051000 08:02 173521 /usr/bin/dbus\-daemon
-00652000\-00655000 rw\-p 00052000 08:02 173521 /usr/bin/dbus\-daemon
-00e03000\-00e24000 rw\-p 00000000 00:00 0 [heap]
-00e24000\-011f7000 rw\-p 00000000 00:00 0 [heap]
-\&...
-35b1800000\-35b1820000 r\-xp 00000000 08:02 135522 /usr/lib64/ld\-2.15.so
-35b1a1f000\-35b1a20000 r\-\-p 0001f000 08:02 135522 /usr/lib64/ld\-2.15.so
-35b1a20000\-35b1a21000 rw\-p 00020000 08:02 135522 /usr/lib64/ld\-2.15.so
-35b1a21000\-35b1a22000 rw\-p 00000000 00:00 0
-35b1c00000\-35b1dac000 r\-xp 00000000 08:02 135870 /usr/lib64/libc\-2.15.so
-35b1dac000\-35b1fac000 \-\-\-p 001ac000 08:02 135870 /usr/lib64/libc\-2.15.so
-35b1fac000\-35b1fb0000 r\-\-p 001ac000 08:02 135870 /usr/lib64/libc\-2.15.so
-35b1fb0000\-35b1fb2000 rw\-p 001b0000 08:02 135870 /usr/lib64/libc\-2.15.so
-\&...
-f2c6ff8c000\-7f2c7078c000 rw\-p 00000000 00:00 0 [stack:986]
-\&...
-7fffb2c0d000\-7fffb2c2e000 rw\-p 00000000 00:00 0 [stack]
-7fffb2d48000\-7fffb2d49000 r\-xp 00000000 00:00 0 [vdso]
-.EE
-.in
-.IP
-The
-.I address
-field is the address space in the process that the mapping occupies.
-The
-.I perms
-field is a set of permissions:
-.IP
-.in +4n
-.EX
-r = read
-w = write
-x = execute
-s = shared
-p = private (copy on write)
-.EE
-.in
-.IP
-The
-.I offset
-field is the offset into the file/whatever;
-.I dev
-is the device
-(major:minor);
-.I inode
-is the inode on that device.
-0 indicates that no inode is associated with the memory region,
-as would be the case with BSS (uninitialized data).
-.IP
-The
-.I pathname
-field will usually be the file that is backing the mapping.
-For ELF files,
-you can easily coordinate with the
-.I offset
-field by looking at the
-Offset field in the ELF program headers
-.RI ( "readelf\ \-l" ).
-.IP
-There are additional helpful pseudo-paths:
-.RS
-.TP
-.I [stack]
-The initial process's (also known as the main thread's) stack.
-.TP
-.IR [stack: tid ] " (from Linux 3.4 to Linux 4.4)"
-.\" commit b76437579d1344b612cf1851ae610c636cec7db0 (added)
-.\" commit 65376df582174ffcec9e6471bf5b0dd79ba05e4a (removed)
-A thread's stack (where the
-.I tid
-is a thread ID).
-It corresponds to the
-.IR /proc/ pid /task/ tid /
-path.
-This field was removed in Linux 4.5, since providing this information
-for a process with large numbers of threads is expensive.
-.TP
-.I [vdso]
-The virtual dynamically linked shared object.
-See
-.BR vdso (7).
-.TP
-.I [heap]
-The process's heap.
-.TP
-.IR [anon: name ] " (since Linux 5.17)"
-.\" Commit 9a10064f5625d5572c3626c1516e0bebc6c9fe9b
-A named private anonymous mapping.
-Set with
-.BR prctl (2)
-.BR PR_SET_VMA_ANON_NAME .
-.TP
-.IR [anon_shmem: name ] " (since Linux 6.2)"
-.\" Commit d09e8ca6cb93bb4b97517a18fbbf7eccb0e9ff43
-A named shared anonymous mapping.
-Set with
-.BR prctl (2)
-.BR PR_SET_VMA_ANON_NAME .
-.in
-.RE
-.IP
-If the
-.I pathname
-field is blank,
-this is an anonymous mapping as obtained via
-.BR mmap (2).
-There is no easy way to coordinate this back to a process's source,
-short of running it through
-.BR gdb (1),
-.BR strace (1),
-or similar.
-.IP
-.I pathname
-is shown unescaped except for newline characters, which are replaced
-with an octal escape sequence.
-As a result, it is not possible to determine whether the original
-pathname contained a newline character or the literal
-.I \e012
-character sequence.
-.IP
-If the mapping is file-backed and the file has been deleted, the string
-" (deleted)" is appended to the pathname.
-Note that this is ambiguous too.
-.IP
-Under Linux 2.0, there is no field giving pathname.
-.SH SEE ALSO
-.BR proc (5)