msgctl.2, semctl.2, shmctl.2: Document STAT_ANY commands

Reported-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

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

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

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.