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seccomp.2: Rework SECCOMP_GET_NOTIF_SIZES somewhat 

The existing text says the structures (plural!) contain a 'struct
seccomp_data'. But this is only true for the received notification
structure (seccomp_notif). So, reword the sentence to be more
general, noting simply that the structures may evolve over time.

Add some comments to the structure definition.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-09-28 09:42:38 +02:00
parent b723c6d8dd
commit 2bbe9bd9ae
1 changed files with 5 additions and 8 deletions
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13
man2/seccomp.2
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@ -267,9 +267,8 @@ must be a pointer to an unsigned 32-bit filter return action.
.BR SECCOMP_GET_NOTIF_SIZES " (since Linux 5.0)"
.\" commit 6a21cc50f0c7f87dae5259f6cfefe024412313f6
Get the sizes of the seccomp user-space notification structures.
Since the structures include a
.I "struct seccomp_data"
which may grow in size, this command can be used to determine how
Since these structures may evolve and grow over time,
this command can be used to determine how
much memory to allocate for sending and receiving notifications.
.IP
The value of
@ -280,15 +279,13 @@ must be a pointer to a
.IR "struct seccomp_notif_sizes" ,
which has the following form:
.IP
.in +4n
.EX
struct seccomp_notif_sizes
__u16 seccomp_notif;
__u16 seccomp_notif_resp;
__u16 seccomp_data;
__u16 seccomp_notif; /* Size of notification structure */
__u16 seccomp_notif_resp; /* Size of response structure */
__u16 seccomp_data; /* Size of \(aqstruct seccomp_data\(aq */
};
.EE
.in
.IP
See
.BR seccomp_unotify (2)