is_context_customizable - check whether SELinux context type is customizable by the administrator
#include <selinux/selinux.h>
int is_context_customizable(char *scon);
This function checks whether the type of scon is in the /etc/selinux/{SELINUXTYPE}/context/customizable_types file. A customizable type is a file context type that administrators set on files, usually to allow certain domains to share the file content. restorecon and setfiles, by default, leave these context in place.
Returns 1 if security context is customizable or 0 if it is not. Returns -1 on error.
/etc/selinux/{SELINUXTYPE}/context/customizable_types
selinux(8)