retrieves the context used for creating a new labeled network socket.
This returned context should be freed with freecon if non-NULL.
getsockcreatecon sets *con to NULL if no sockcreate context has been explicitly
set by the program (i.e. using the default policy behavior).
sets the context used for creating a new labeled network sockets
NULL can be passed to
setsockcreatecon to reset to the default policy behavior.
The sockcreate context is automatically reset after the next execve, so a
program doesn't need to explicitly sanitize it upon startup.
setsockcreatecon can be applied prior to library
functions that internally perform an file creation,
in order to set an file context on the objects.
Note: Signal handlers that perform an setsockcreate must take care to
save, reset, and restore the sockcreate context to avoid unexpected behavior.
On error -1 is returned.
On success 0 is returned.