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Date: Sun, 4 Nov 2018 17:29:18 +0100
From: "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To: Davidlohr Bueso <dave@...olabs.net>, akpm@...ux-foundation.org
Cc: mtk.manpages@...il.com, mhocko@...nel.org,
robert.kettler@...look.com, manfred@...orfullife.com,
ebiederm@...ssion.com, keescook@...omium.org,
linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
Joe Lawrence <joe.lawrence@...hat.com>
Subject: Re: [PATCH -next v2 0/3] sysvipc: introduce STAT_ANY commands
Hello Davidlohr,
On 3/20/18 7:55 PM, Davidlohr Bueso wrote:
> On Thu, 15 Feb 2018, Davidlohr Bueso wrote:
>
>> Once (if) merged, I will submit the necesary manpage updates. But I'm
>> thinking something like:
>
> Hi Michael, here are the updated manpage entries. As always, please feel
> free to modify the descriptions as you see fit.
Thanks. Patch applied. Sorry for the delay...
Cheers,
Michael
> ------------8<----------------------------------------------------------
> [PATCH] sysvipc: add *_STAT_ANY command descriptions
>
> The *ctl syscall descriptions have been updated to reflect the
> new commands in msg queues, semaphores and shmem.
>
> Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
> ---
> man2/msgctl.2 | 20 +++++++++++++++++---
> man2/semctl.2 | 19 ++++++++++++++++++-
> man2/shmctl.2 | 17 +++++++++++++++--
> 3 files changed, 50 insertions(+), 6 deletions(-)
>
> diff --git a/man2/msgctl.2 b/man2/msgctl.2
> index df74c750457a..31b1a1f12fb0 100644
> --- a/man2/msgctl.2
> +++ b/man2/msgctl.2
> @@ -33,6 +33,7 @@
> .\" Language and formatting clean-ups
> .\" Added msqid_ds and ipc_perm structure definitions
> .\" 2005-08-02, mtk: Added IPC_INFO, MSG_INFO, MSG_STAT descriptions
> +.\" 2018-03-20, dbueso: Added MSG_STAT_ANY description.
> .\"
> .TH MSGCTL 2 2017-09-15 "Linux" "Linux Programmer's Manual"
> .SH NAME
> @@ -222,10 +223,23 @@ Return a
> structure as for
> .BR IPC_STAT .
> However, the
> -.I msqid
> +.I msgid
> argument is not a queue identifier, but instead an index into
> the kernel's internal array that maintains information about
> all message queues on the system.
> +.TP
> +.BR MSG_STAT_ANY " (Linux-specific)"
> +Return a
> +.I msqid_ds
> +structure as for
> +.BR MSG_STAT .
> +However, the
> +.I msg_perm.mode
> +is not checked for read access for
> +.IR msqid ,
> +resembing the behaviour of
> +/proc/sysvipc/msg.
> +.PP
> .SH RETURN VALUE
> On success,
> .BR IPC_STAT ,
> @@ -241,10 +255,10 @@ operation returns the index of the highest used entry in the
> kernel's internal array recording information about all
> message queues.
> (This information can be used with repeated
> -.B MSG_STAT
> +.B MSG_STAT or MSG_STAT_ANY
> operations to obtain information about all queues on the system.)
> A successful
> -.B MSG_STAT
> +.B MSG_STAT or MSG_STAT_ANY
> operation returns the identifier of the queue whose index was given in
> .IR msqid .
> .PP
> diff --git a/man2/semctl.2 b/man2/semctl.2
> index 02930d2c74ae..0ebe0434c05f 100644
> --- a/man2/semctl.2
> +++ b/man2/semctl.2
> @@ -37,6 +37,7 @@
> .\" Rewrote semun text
> .\" Added semid_ds and ipc_perm structure definitions
> .\" 2005-08-02, mtk: Added IPC_INFO, SEM_INFO, SEM_STAT descriptions.
> +.\" 2018-03-20, dbueso: Added SEM_STAT_ANY description.
> .\"
> .TH SEMCTL 2 2017-09-15 "Linux" "Linux Programmer's Manual"
> .SH NAME
> @@ -240,6 +241,17 @@ argument is not a semaphore identifier, but instead an index into
> the kernel's internal array that maintains information about
> all semaphore sets on the system.
> .TP
> +.BR SEM_STAT_ANY " (Linux-specific)"
> +Return a
> +.I seminfo
> +structure containing the same information as for
> +.BR SEM_STAT .
> +However, the
> +.I sem_perm.mode
> +is not checked for read access for
> +.IR semid ,
> +resembing the behaviour of
> +/proc/sysvipc/sem.
> .B GETALL
> Return
> .B semval
> @@ -367,7 +379,7 @@ the index of the highest used entry in the
> kernel's internal array recording information about all
> semaphore sets.
> (This information can be used with repeated
> -.B SEM_STAT
> +.B SEM_STAT or SEM_STAT_ANY
> operations to obtain information about all semaphore sets on the system.)
> .TP
> .B SEM_INFO
> @@ -377,6 +389,10 @@ as for
> .B SEM_STAT
> the identifier of the semaphore set whose index was given in
> .IR semid .
> +.TP
> +.B SEM_STAT_ANY
> +as for
> +.BR SEM_STAT .
> .PP
> All other
> .I cmd
> @@ -397,6 +413,7 @@ has one of the values
> .BR GETZCNT ,
> .BR IPC_STAT ,
> .BR SEM_STAT ,
> +.BR SEM_STAT_ANY ,
> .BR SETALL ,
> or
> .B SETVAL
> diff --git a/man2/shmctl.2 b/man2/shmctl.2
> index 7bb503999941..42c47d9f4350 100644
> --- a/man2/shmctl.2
> +++ b/man2/shmctl.2
> @@ -41,6 +41,7 @@
> .\" 2005-04-25, mtk -- noted aberrant Linux behavior w.r.t. new
> .\" attaches to a segment that has already been marked for deletion.
> .\" 2005-08-02, mtk: Added IPC_INFO, SHM_INFO, SHM_STAT descriptions.
> +.\" 2018-03-20, dbueso: Added SHM_STAT_ANY description.
> .\"
> .TH SHMCTL 2 2017-09-15 "Linux" "Linux Programmer's Manual"
> .SH NAME
> @@ -242,6 +243,18 @@ However, the
> argument is not a segment identifier, but instead an index into
> the kernel's internal array that maintains information about
> all shared memory segments on the system.
> +.TP
> +.BR SHM_STAT_ANY " (Linux-specific)"
> +Return a
> +.I shmid_ds
> +structure as for
> +.BR SHM_STAT .
> +However, the
> +.I shm_perm.mode
> +is not checked for read access for
> +.IR shmid ,
> +resembing the behaviour of
> +/proc/sysvipc/shm.
> .PP
> The caller can prevent or allow swapping of a shared
> memory segment with the following \fIcmd\fP values:
> @@ -287,7 +300,7 @@ operation returns the index of the highest used entry in the
> kernel's internal array recording information about all
> shared memory segments.
> (This information can be used with repeated
> -.B SHM_STAT
> +.B SHM_STAT or SHM_STAT_ANY
> operations to obtain information about all shared memory segments
> on the system.)
> A successful
> @@ -328,7 +341,7 @@ isn't accessible.
> \fIshmid\fP is not a valid identifier, or \fIcmd\fP
> is not a valid command.
> Or: for a
> -.B SHM_STAT
> +.B SHM_STAT or SHM_STAT_ANY
> operation, the index value specified in
> .I shmid
> referred to an array slot that is currently unused.
>
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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