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Diffstat (limited to 'man7/unix.7')
| -rw-r--r-- | man7/unix.7 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/man7/unix.7 b/man7/unix.7 index 0850ebc1be..e4c19324de 100644 --- a/man7/unix.7 +++ b/man7/unix.7 @@ -435,6 +435,19 @@ To receive a message, the .B SO_PASSCRED option must be enabled on the socket. +.PP +If the space allocated for receiving incoming ancillary data is too small, +then the ancillary data is truncated to the number of headers +that will fit in the supplied buffer (or, in the case of an +.BR SCM_RIGHTS +file descriptor list, the list of file descriptors may be truncated). +In the event of such truncation, the +.BR MSG_CTRUNC +flag will be set in the +.I msg.msg_flags +value returned by +.BR recvmsg (2). +.\" .SS Ioctls The following .BR ioctl (2) |