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Document SCM_CREDS changes.

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This commit is contained in:
Bill Paul 1997-03-21 16:52:05 +00:00
parent 0b788fa1da
commit effbdb690f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=24084
1 changed files with 28 additions and 0 deletions
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28
lib/libc/sys/recv.2
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@ -200,6 +200,34 @@ and
set to
.Dv SCM_RIGHTS .
.Pp
Process credentials can also be passed as ancillary data for
.Dv AF_UNIX
domain sockets using a
.Fa cmsg_type
of
.Dv SCM_CREDS.
In this case,
.Fa cmsg_data
should be a structure of type
.Fa cmsgcred ,
which is defined in
.Ao Pa sys/socket.h Ac
as follows:
.Pp
.Bd -literal
struct cmsgcred {
pid_t cmcred_pid; /* PID of sending process */
uid_t cmcred_uid; /* real UID of sending process */
uid_t cmcred_euid; /* effective UID of sending process */
gid_t cmcred_gid; /* real GID of sending process */
short cmcred_ngroups; /* number or groups */
gid_t cmcred_groups[CMGROUP_MAX]; /* groups */
};
.Ed
.Pp
The kernel will fill in the credential information of the sending process
and deliver it to the receiver.
.Pp
The
.Fa msg_flags
field is set on return according to the message received.