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==================== Changes in man-pages-4.08 ====================
Released: 2016-10-08, Munich
Contributors
------------
The following people contributed patches/fixes or (noted in brackets
in the changelog below) reports, notes, and ideas that have been
incorporated in changes in this release:
Arnaud Gaillard <arnaud.mgaillard@gmail.com>
Bill Pemberton <wfp5p@worldbroken.com>
Carlos O'Donell <carlos@redhat.com>
Christoph Hellwig <hch@lst.de>
David Turner <novalis@novalis.org>
Dr. Tobias Quathamer <toddy@debian.org>
Elliott Hughes <enh@google.com>
Eugene Syromyatnikov <evgsyr@gmail.com>
Heinrich Schuchardt <xypron.glpk@gmx.de>
Hu Keping <hukeping@huawei.com>
Igor Liferenko <igor.liferenko@gmail.com>
Ivan Kharpalev <ivan.kharpalev@gmail.com>
Jakub Wilk <jwilk@jwilk.net>
Jann Horn <jann@thejh.net>
Josh Triplett <josh@joshtriplett.org>
Keno Fischer <keno@juliacomputing.com>
Laurent Georget <laurent.georget@supelec.fr>
Local Lembke <logan@blackhillsinfosec.com>
Mats Wichmann <mats@wichmann.us>
Michael Kerrisk <mtk.manpages@gmail.com>
Mike Crowe <mac@mcrowe.com>
Mike Frysinger <vapier@gentoo.org>
Namhyung Kim <namhyung@gmail.com>
Nikola Forró <nforro@redhat.com>
Patrick McLean <patrickm@gaikai.com>
Peter Wu <peter@lekensteyn.nl>
Petr Cermak <petrcermak@chromium.org>
Quentin Rameau <quinq@fifth.space>
Ray Bellis <ray@isc.org>
Rich Felker <dalias@libc.org>
Ruben Kerkhof <ruben@rubenkerkhof.com>
Sam Varshavchik <mrsam@courier-mta.com>
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Siward de Groot <siward@wanadoo.nl>
Sloane Bernstein <sloane@cpanel.net>
Stefan Tauner <tauner@technikum-wien.at>
Tim Savannah <kata198@gmail.com>
Ursache Vladimir <f35f22fan@gmail.com>
Zefram <zefram@fysh.org>
王守堰 <wangshouyan@gmail.com>
Apologies if I missed anyone!
New and rewritten pages
-----------------------
quotactl.2
Eugene Syromyatnikov [Michael Kerrisk]
Updated information regarding disk quota flags
Added information regarding DQF_SYS_FILE flag; updated definition
of V1_DQF_RSQUASH, which has been defined privately and defined
publicly as DQF_ROOT_SQUASH.
Eugene Syromyatnikov
Updated information regarding XFS-specific quotactl subcommands
Added information regarding structure definitions used for
XFS-specific subcommands, updated flag constants, added
information regarding ignored syscall arguments, added notes on
usage of kernel UAPI header.
Eugene Syromyatnikov
Additions regarding project quotas
Added information regarding presence of project quotas.
bswap.3
Michael Kerrisk
New page documenting bswap_16(), bswap_32(), and bswap_64()
cgroups.7
Michael Kerrisk
Substantial rewrites, additions, and corrections.
Newly documented interfaces in existing pages
---------------------------------------------
readv.2
Michael Kerrisk
Document the pwritev2() RWF_SYNC and RWF_DSYNC flags
proc.5
Michael Kerrisk
Document /proc/PID/seccomp
Jann Horn
Document /proc/[pid]/task/[tid]/children
Document the /proc/[pid]/task/[tid]/children interface from
CRIU, and more importantly, document why it's usually not
a good interface.
New and changed links
---------------------
bswap_16.3
bswap_32.3
bswap_64.3
New link to new bswap.3
Global changes
--------------
Various pages
Michael Kerrisk
Fix section ordering
Various pages had sections in an order different from
that prescribed in man-pages(7).
Various pages
Michael Kerrisk [Mike Frysinger]
Consistently use /proc/[pid] (not /proc/PID)
Various pages
Michael Kerrisk
Fix order of SEE ALSO entries
Entries should be ordered first by section, and then alphabetically
within the section.
Various pages
Michael Kerrisk
Order ERRORS alphabetically
Various pages
Michael Kerrisk
Remove section number from page self reference
Fix places where pages refer to the function that they describe
and include a section number in that reference. Such references
cause some HTML-rendering tools to create self-references in the
page.
A few pages
Michael Kerrisk
Eliminate groff "cannot adjust line" warnings
Changes to individual pages
---------------------------
pldd.1
Michael Kerrisk [Carlos O'Donell]
Note gdb(1) command that can be used as a replacement for pldd
Taken from Carlos O'Donnell's suggestion in
https://sourceware.org/bugzilla/show_bug.cgi?id=18035#c2
Michael Kerrisk
BUGS: pldd has not worked since glibc 2.19
accept.2
Michael Kerrisk
Mention epoll(7) alongside poll()/select()
Michael Kerrisk
Demote discussion of DECNet to NOTES
DECNet ceased to be important long ago...
adjtimex.2
Nikola Forró
Fix kernel version references
chroot.2
Michael Kerrisk
Note user namespace requirements for CAP_SYS_CHROOT
clone.2
Keno Fischer [Josh Triplett]
Adjust syscall prototype and expand CLONE_SETTLS description
Michael Kerrisk [Josh Triplett, Josh Triplett]
Document raw syscall interfaces on various other architectures
Michael Kerrisk
Change types for 'ptid' and 'ctid' in syscall prototypes
These types changed from 'void *' to 'int *' back in Linux 3.8.
Michael Kerrisk
EINVAL is generated by glibc wrapper for NULL 'fn' or 'child_stack'
Clarify that this error is produced by the wrapper function, not
the underlying system call. In particular, the point is that the
raw system call can accommodate a NULL pointer for 'child_stack'.
Michael Kerrisk [Elliott Hughes]
Make the implications of CLONE_FILES more explicit
If CLONE_FILES is not set, the duplicated FDs nevertheless share
file offset and status flags via the open file description.
Michael Kerrisk
Mention kcmp() under notes
close.2
Michael Kerrisk
Add mention of the close-on-exec flag
Michael Kerrisk
Clarify discussion noting that close() does not flush buffer cache
epoll_wait.2
Mike Crowe
Clarify that the timeout is measured against CLOCK_MONOTONIC
execve.2
Michael Kerrisk
Mention use of 'environ' to access environment list
Michael Kerrisk
Note that real UID, real GID, and supplementary GIDs are unchanged
fanotify_init.2
Heinrich Schuchardt
Update BUGS information
fcntl.2
Michael Kerrisk
Note an important detail of F_SETOWN permission rules for signals
F_SETOWN records the caller's credentials at the time of
the fcntl() call, and it is these saved credentials that
are used for subsequent permission checks.
Michael Kerrisk
Make the description of the effect of close-on-exec a little clearer
Michael Kerrisk
Clarify that F_GETFD and F_GETFL return flags via the function result
fork.2
Michael Kerrisk
PID of new process also does not match any existing session ID
fsync.2
Michael Kerrisk
SEE ALSO: add pwritev(2)
Since Linux 4.7, pwritev() has flags related to I/O
integrity completion.
getdomainname.2
Michael Kerrisk
Note user namespace requirements for CAP_SYS_ADMIN
getgroups.2
Michael Kerrisk
Note user namespace requirements for CAP_SETGID
gethostname.2
Michael Kerrisk
Note user namespace requirements for CAP_SYS_ADMIN
getrlimit.2
Michael Kerrisk
Note user namespace semantics for CAP_SYS_RESOURCE
getsid.2
Michael Kerrisk
Rework description to be somewhat clearer
Michael Kerrisk
Correct the definition of "session ID"
getunwind.2
Michael Kerrisk
Simplify text referring to vdso(7)
The detail given here is redundant, since this info is also
in vdso(7).
kcmp.2
Michael Kerrisk
Add an example program
kill.2
Michael Kerrisk
Note the user namespace requirement for CAP_KILL
killpg.2
Michael Kerrisk
Refer reader to kill(2) for signal permission rules
mlock.2
Sebastian Andrzej Siewior
Document that fork() after mlock() may be a bad idea in a RT process
mmap.2
Jann Horn
Describe treatment of 'offset' for MAP_ANONYMOUS
Michael Kerrisk [Siward de Groot]
Small improvement to description of MAP_SHARED
See https://sourceware.org/bugzilla/show_bug.cgi?id=6887
msgctl.2
msgget.2
msgop.2
semctl.2
semget.2
semop.2
shmctl.2
shmget.2
shmop.2
Michael Kerrisk
Note the user namespace requirements for CAP_IPC_OWNER
open.2
Michael Kerrisk
Clarify user namespace capability requirements for O_NOATIME
Michael Kerrisk
NOTES: kcmp() can be used to test if two FDs refer to the same OFD
Michael Kerrisk
F2FS support for O_TMPFILE was added in Linux 3.16
Michael Kerrisk
Clarify the rules about how the group ID of a new file is determined
prctl.2
Michael Kerrisk
Refer to proc(5) for effects of dumpability on ownership of /proc/PID/*
Michael Kerrisk
ERRORS: Add EACCES error for PR_SET_SECCOMP-SECCOMP_MODE_FILTER
Michael Kerrisk
Simplify list of cases where "dumpable" attribute is reset
Michael Kerrisk
Note user namespace requirements for PR_CAPBSET_DROP CAP_SETPCAP
readlink.2
Michael Kerrisk [Ursache Vladimir]
Make example program handle links that report a size of zero
Some "magic" symlinks created by the kernel (e.g., those under
/proc and /sys) report 'st_size' as zero. Modify the example
program to handle that possibility.
Michael Kerrisk
Emphasize that truncation of returned buffer generates no error
readv.2
Michael Kerrisk [Christoph Hellwig]
Clarify that RWF_DSYNC and RWF_SYNC apply only to data being written
Michael Kerrisk
Add preadv2() and pwritev2() to NAME line
reboot.2
Michael Kerrisk
Note user namespace requirements around CAP_SYS_BOOT
rename.2
Michael Kerrisk [Tim Savannah]
Clarify that ERRORS may cause rename to fail (not to be nonatomic)
sched_setaffinity.2
Michael Kerrisk
Note user namespace requirements for CAP_SYS_NICE
seccomp.2
Michael Kerrisk
CAP_SYS_ADMIN is required only in caller's user namespace
select_tut.2
Peter Wu
Fix various issues in example program
seteuid.2
Michael Kerrisk
Note user namespace requirements for CAP_SETUID and CAP_SETGID
setgid.2
Michael Kerrisk
Note user namespace requirements for CAP_SETGID
setpgid.2
Michael Kerrisk
Add a reference to credentials(7)
setpgid.2
setsid.2
Michael Kerrisk
Relocate some text on sessions and sessions leaders
Some text that was in setpgid(2) is better placed in setsid(2).
setresuid.2
Michael Kerrisk
Note user namespace requirements for CAP_SETUID
setreuid.2
Michael Kerrisk
Note user namespace requirements for CAP_SETUID and CAP_SETGID
setsid.2
Michael Kerrisk
Refer to credentials(7) for details for details on controlling terminal
Refer to credentials(7) for details of how a session obtains
a controlling terminal.
set_thread_area.2
Michael Kerrisk
Add get_thread_area() to NAME
setuid.2
Michael Kerrisk
Note user namespace requirements for CAP_SETUID
sigprocmask.2
Keno Fischer
Expand/clarify libc/kernel sigset_t difference
stat.2
Michael Kerrisk [Ursache Vladimir, Mats Wichmann]
Improve discussion of 'st_size' for /proc and /sys files
Michael Kerrisk
_BSD_SOURCE and _SVID_SOURCE no longer expose nanosecond timestamps
umask.2
Michael Kerrisk
Provide a rationale for the existence of /proc/PID/status 'Umask' field
wait.2
Michael Kerrisk
Remove erroneous statement that waitpid() is implemented via wait4()
There is a fallback to wait4(), but only if the kernel does
not provide a waitpid() system call.
bindresvport.3
rcmd.3
ip.7
Michael Kerrisk
Note user namespace requirements for CAP_NET_BIND_SERVICE
byteorder.3
Michael Kerrisk
SEE ALSO: add bswap(3)
dlopen.3
Michael Kerrisk
dlmopen() is still broken in glibc 2.24
endian.3
Michael Kerrisk
SEE ALSO: add bswap(3)
ffs.3
Michael Kerrisk [Stefan Tauner]
Correct feature test macro requirements
fmemopen.3
Michael Kerrisk [Rich Felker]
Remove bogus suggestion to use setbuffer()
getlogin.3
Michael Kerrisk
Update feature test macro requirements for cuserid()
getumask.3
Michael Kerrisk
Note that getumask() is still unavailable in glibc 2.24
Michael Kerrisk
Point to umask(2) for a thread-safe way to discover process's umask
mkstemp.3
Quentin Rameau
Fix _POSIX_C_SOURCE value for mkstemp()
The correct _POSIX_C_SOURCE value has always been 200809L,
not 200112L.
pthread_join.3
Michael Kerrisk [Mats Wichmann]
Note that the caller might do clean up after joining with a thread
Michael Kerrisk [王守堰]
Clarify use of 'retval' pointer
resolver.3
Ray Bellis
Correct arguments to res_ninit(res_state statep)
strverscmp.3
Michael Kerrisk
Add an example program
wcstombs.3
Michael Kerrisk [Igor Liferenko]
wcsrtombs() does not provide thread-safe interface to same functionality
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741360
core.5
Mike Frysinger [Michael Kerrisk]
Add more details for output paths and the crash handler
People sometimes assume that the crash handler runs in the same
context as the crashing process. They would be incorrect :).
proc.5
Mike Frysinger
Clarify the root symlink and mount namespaces
If the target process is in a different mount namespace, the root
symlink actually shows that view of the filesystem.
Michael Kerrisk [Mike Frysinger]
Expand discussion of /proc/[pid]/root
Add a shell example showing that /proc/[pid]/root is more
than a symlink. Based on an example provided by Mike Frysinger
in an earlier commit message.
Michael Kerrisk
Explain rules determining ownership of /proc/PID/* files
Describe the effect of the "dumpable" attribute on ownership
of /proc/PID files.
Michael Kerrisk
Note effect of 'suid_dumpable' on ownership of /proc/PID files
Michael Kerrisk
Refer to ptrace(2) for info on effect of suid_dumpable on ptraceability
Michael Kerrisk
Add reference to core(5) in discussion of 'suid_dumpable'
Michael Kerrisk
Note that 'suid_dumpable' mode 1 is insecure
Michael Kerrisk
Document /proc/meminfo '+ShmemHugePages' and 'ShmemPmdMapped' fields
Michael Kerrisk
Document /proc/PID/status 'RssAnon', 'RssFile', and 'RssShmem' fields
Michael Kerrisk
Document /proc/PID/status 'HugetlbPages' field
Michael Kerrisk [Zefram]
Clarify that /proc/PID/statm 'shared' field counts *resident* pages
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741360
Michael Kerrisk
Add reference to umask(2) in discussion of /proc/PID/status 'Umask'
Michael Kerrisk
Clarify user namespace requirements for /proc/sys/fs/protected_hardlinks
Michael Kerrisk
Note changes to config option governing /proc/[pid]/task/[tid]/children
Michael Kerrisk
Clarify description of /proc/PID/statm 'lib' and 'dt' fields
These fields are always zero since Linux 2.6.
Namhyung Kim [Petr Cermak]
Add description of CLEAR_REFS_MM_HIWATER_RSS
Michael Kerrisk
Update example VM values in /proc/PID/status
capabilities.7
Michael Kerrisk
Add note about nosuid to file capabilities section
Michael Kerrisk
SEE ALSO: add proc(5)
Michael Kerrisk
SEE ALSO: add setsid(2) and setpgid(2)
glob.7
Michael Kerrisk [Arnaud Gaillard]
Clarify that syntactically incorrect patterns are left unchanged
packet.7
Michael Kerrisk
Clarify user namespace requirements for CAP_NET_RAW
pipe.7
Michael Kerrisk [Patrick McLean]
Document FIONREAD
raw.7
Michael Kerrisk
Clarify user namespace requirements for CAP_NET_RAW
Also remove mention of UID 0 as a method or creating
a raw socket. As far as I can tell from reading the
kernel source (net/ipv4/af_inet.c), this is not true.
socket.7
Michael Kerrisk
SIOCSPGRP: refer to fcntl(2) F_SETOWN for correct permission rules
The permission rules described for SIOCCPGRP are wrong. Rather
than repeat the rules here, just refer the reader to fcntl(2),
where the rules are described for F_SETOWN.
unix.7
Michael Kerrisk [Laurent Georget, Ivan Kharpalev]
Remove mention of recvmsg() from discussion of EPIPE error
See https://bugzilla.kernel.org/show_bug.cgi?id=137351
ld.so.8
Michael Kerrisk
Expand description of LD_DEBUG
Provide a list of the categories, and note that multiple
categories can be specified.
Michael Kerrisk
Add glibc version for LD_USE_LOAD_BIAS
Michael Kerrisk
Clarify text describing whether secure-mode programs preload libraries
Michael Kerrisk
Remove discussion of environment variables understood by libc5
libc5 disappeared long ago, so cease cluttering up this page
with those ancient details. Thus, remove discussion of the
following environment variables: LD_AOUT_LIBRARY_PATH,
LD_AOUT_PRELOAD, LD_KEEPDIR, LD_NOWARN, and LDD_ARGV0.
Michael Kerrisk
Remove text with ancient libc4 and Linux libc details
Michael Kerrisk
Remove mention of "ELF only"
Drawing a distinction between ELF-only features versus a,out
ceased to be relevant long ago, so cluttering the page
with "ELF-only" serves no purpose.
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