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Diffstat (limited to 'man7/unix.7')
| -rw-r--r-- | man7/unix.7 | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/man7/unix.7 b/man7/unix.7 index 50828a5bc8..298521d4a9 100644 --- a/man7/unix.7 +++ b/man7/unix.7 @@ -349,6 +349,52 @@ stream sockets and for .B AF_UNIX stream and datagram socket pairs created using .BR socketpair (2). +.TP +.B SO_PEERSEC +This read-only socket option returns the +security context of the peer socket connected to this socket. +By default, this will be the same as the security context of +the process that created the peer socket unless overridden +by the policy or by a process with the required permissions. +.IP +The argument to +.BR getsockopt (2) +is a pointer to a +buffer of the specified length in bytes +into which the security context string will be copied. +If the buffer length is less than the length of the security +context string, then +.BR getsockopt (2) +will return the required length +via +.I optlen +and return \-1 and sets +.I errno +to +.BR ERANGE . +The caller should allocate at least +.BR NAME_MAX +bytes for the buffer initially although this is not guaranteed +to be sufficient. Resizing the buffer to the returned length +and retrying may be necessary. +.IP +The security context string may include a terminating null character +in the returned length, but is not guaranteed to do so: a security +context "foo" might be represented as either {'f','o','o'} of length 3 +or {'f','o','o','\\0'} of length 4, which are considered to be +interchangeable. It is printable, does not contain non-terminating +null characters, and is in an unspecified encoding (in particular it +is not guaranteed to be ASCII or UTF-8). +.IP +The use of this option for sockets in the +.B AF_UNIX +address family +is supported since Linux 2.6.2 for connected stream sockets and +since Linux 4.18, +.\" commit 0b811db2cb2aabc910e53d34ebb95a15997c33e7 +also for stream and datagram socket pairs created +using +.BR socketpair (2). .\" .SS Autobind feature If a |