sepol_genusers man page
sepol_genusers — Generate a new binary policy image with a customized user configuration
int sepol_genusers(void *data, size_t len, const char *usersdir, void *newdata, size_t *newlen);
void sepol_set_delusers(int on);
sepol_genusers generates a new binary policy image from an existing binary policy image stored in the memory region described by the starting address data and the length len and a pair of user configuration files named system.users and local.users from the directory specified by usersdir. The resulting binary policy is placed into dynamically allocated memory and the variables newdata and newlen are set to refer to the new binary image's starting address and length. The original binary policy image is not modified.
By default, sepol_genusers will preserve user entries that are defined in the original binary policy image but not defined in the user configuration files. If such user entries should instead by omitted entirely from the new binary policy image, then the sepol_set_delusers function may be called with on set to 1 prior to calling sepol_genusers in order to enable deletion of such users.
Returns 0 on success or -1 otherwise, with errno set appropriately. An errno of ENOENT indicates that one or both of the user configuration files did not exist. An errno of EINVAL indicates that either the original binary policy image or the generated one were invalid. An errno of ENOMEM indicates that insufficient memory was available to process the original binary policy image or to generate the new policy image. Invalid entries in the user configuration files are skipped with a warning.