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35 .Nd determine whether a socket is at the out-of-band mark
41 .Fn sockatmark "int s"
45 function determines whether the socket referenced by the file descriptor
47 is at the out-of-band mark.
51 function returns 1 to indicate that the socket is at an out-of-band mark;
52 0 is returned if there is no out-of-band mark or the mark is preceded
54 Otherwise, -1 is returned and
56 is set to indicate the error.
60 function will fail if:
65 is not a valid file descriptor.
69 does not refer to a socket.
76 .%T "An Introductory 4.4BSD Interprocess Communication Tutorial"
79 .Pq see Pa /usr/share/doc/psd/20.ipctut
81 .%T "Advanced 4.4BSD IPC Tutorial"
89 .Pq see Pa /usr/share/doc/psd/21.ipc
100 as a replacement for the