swaylock/include/comm.h

#ifndef _SWAYLOCK_COMM_H
#define _SWAYLOCK_COMM_H

#include <stdbool.h>

struct swaylock_password;

enum conn_reply_kind {
	REPLY_SUCCESS,
	REPLY_AUTH_ERR,
	REPLY_CONTINUE,
	REPLY_MSG,
};

struct comm_reply {
	enum conn_reply_kind kind;
	char pam_msg[256];
};

bool spawn_comm_child(void);
ssize_t read_comm_request(char **buf_ptr);
bool write_comm_reply(struct comm_reply reply);
// Requests the provided password to be checked. The password is always cleared
// when the function returns.
bool write_comm_request(struct swaylock_password *pw);
struct comm_reply read_comm_reply(void);
// FD to poll for password authentication replies.
int get_comm_reply_fd(void);

#endif