#ifndef _QARSH_PACKET_H
# define _QARSH_PACKET_H	1

#include <sys/types.h>

#define QARSH_MAX_PACKET_SIZE 32*1024

enum qa_packet_type {
	QP_INVALID = 0,
	QP_HELLO = 1,
	QP_RETURNCODE = 2,
	QP_RUNCMD = 3,
	QP_ACK = 4,
	QP_CMDEXIT = 5
};

struct qp_hello_pkt {
	char *qp_greeting;
};

struct qp_returncode_pkt {
	int qp_rc;
	int qp_errno;
	char *qp_strerror;
};

struct qp_runcmd_pkt {
	char *qp_cmdline;
	int qp_stdin_port;
	int qp_stdout_port;
	int qp_stderr_port;
};

/* General packet for acknowledging a command worked */
struct qp_ack_pkt {
	enum qa_packet_type qp_ack_type;
	int qp_ack_seq;
};

struct qp_cmdexit_pkt {
	pid_t qp_pid;
	int qp_status;
};

#define QP_VERSION 1

struct qa_packet {
	enum qa_packet_type qp_type;
	int qp_seq;	/* Sequence number for this packet */
	union {
		struct qp_hello_pkt hello;
		struct qp_returncode_pkt returncode;
		struct qp_runcmd_pkt runcmd;
		struct qp_ack_pkt ack;
		struct qp_cmdexit_pkt cmdexit;
	} qp_u;
};

#define qp_hello qp_u.hello
#define qp_returncode qp_u.returncode
#define qp_runcmd qp_u.runcmd
#define qp_ack qp_u.ack
#define qp_cmdexit qp_u.cmdexit

/* Prototypes */
char *qp_packet_type(enum qa_packet_type t);
struct qa_packet *parse_packets(char *buf, int n);
struct qa_packet *make_qp_hello(char *greeting);
struct qa_packet *make_qp_ack(enum qa_packet_type t, int i);
struct qa_packet *make_qp_runcmd(char *cmdline, int p_in, int p_out, int p_err);
struct qa_packet *make_qp_cmdexit(pid_t pid, int status);
char *qptostr(struct qa_packet *qp, char **qpstr, int *qpsize);
void qpfree(struct qa_packet *qp);
void dump_qp(struct qa_packet *qp);

#endif /* !_QARSH_PACKET_H */