To create a socket in the local namespace, use the constant
PF_LOCAL as the namespace argument to
socketpair. This constant is defined in sys/socket.h.
This designates the local namespace, in which socket addresses are local names, and its associated family of protocols.
PF_Localis the macro used by Posix.1g.
The structure for specifying socket names in the local namespace is defined in the header file sys/un.h:
This structure is used to specify local namespace socket addresses. It has the following members:
short int sun_family
- This identifies the address family or format of the socket address. You should store the value
AF_LOCALto designate the local namespace. See Socket Addresses.
- This is the file name to use.
Incomplete: Why is 108 a magic number? RMS suggests making this a zero-length array and tweaking the following example to use
allocato allocate an appropriate amount of storage based on the length of the filename.
You should compute the length parameter for a socket address in
the local namespace as the sum of the size of the
component and the string length (not the allocation size!) of
the file name string. This can be done using the macro
Preliminary: | MT-Safe | AS-Safe | AC-Safe | See POSIX Safety Concepts.
The macro computes the length of socket address in the local namespace.