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C Interface
int dup (s)
int s;
Description
This function returns a socket descriptor that refers to the same socket as
specified by s. Both descriptors can be used to reference the
socket. The new socket descriptor is the lowest numbered available socket
descriptor.
For more information about dup or any other POSIX function, refer to
the MPE/iX Developer's
Kit Reference Manual, Volume 1.
Return Value
If the call is successful, a valid file descriptor referencing the socket is
returned. If it fails a -1 is returned, and an error code is stored in
errno.
Errors
| Error Code |
Description |
| [ENOTSOCK]
| The argument s is not a valid socket descriptor. |
| [ENOMEM] |
The process has no more descriptors available. |
See Also
socket
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