#ifndef _XOPEN_SOURCE

#define _XOPEN_SOURCE 700

#endif

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include <sys/types.h>

#include <sys/msg.h>

#include <sys/wait.h>

#include <unistd.h>

#include "test.h"

static const char path[] = ".";

static const int id = 'm';

#define T(f) do{ \

	if ((f)+1 == 0) \

		t_error("%s failed: %s\n", #f, strerror(errno)); \

}while(0)

#define EQ(a,b,fmt) do{ \

	if ((a) != (b)) \

		t_error("%s == %s failed: " fmt "\n", #a, #b, a, b); \

}while(0)

static void snd()

{

	time_t t;

	key_t k;

	int qid;

	struct msqid_ds qid_ds;

	struct {

		long type;

		char data[20];

	} msg = {1, "test message"};

	T(t = time(0));

	T(k = ftok(path, id));

	/* make sure we get a clean message queue id */

	T(qid = msgget(k, IPC_CREAT|0666));

	T(msgctl(qid, IPC_RMID, 0));

	T(qid = msgget(k, IPC_CREAT|IPC_EXCL|0666));

	if (t_status)

		exit(t_status);

	/* check IPC_EXCL */

	errno = 0;

	if (msgget(k, IPC_CREAT|IPC_EXCL|0666) != -1 || errno != EEXIST)

		t_error("msgget(IPC_CREAT|IPC_EXCL) should have failed with EEXIST, got %s\n", strerror(errno));

	/* check if msgget initilaized the msqid_ds structure correctly */

	T(msgctl(qid, IPC_STAT, &qid_ds));

	EQ(qid_ds.msg_perm.cuid, geteuid(), "got %d, want %d");

	EQ(qid_ds.msg_perm.uid, geteuid(), "got %d, want %d");

	EQ(qid_ds.msg_perm.cgid, getegid(), "got %d, want %d");

	EQ(qid_ds.msg_perm.gid, getegid(), "got %d, want %d");

	EQ(qid_ds.msg_perm.mode & 0x1ff, 0666, "got %o, want %o");

	EQ(qid_ds.msg_qnum, 0, "got %d, want %d");

	EQ(qid_ds.msg_lspid, 0, "got %d, want %d");

	EQ(qid_ds.msg_lrpid, 0, "got %d, want %d");

	EQ((long)qid_ds.msg_stime, 0, "got %ld, want %d");

	EQ((long)qid_ds.msg_rtime, 0, "got %ld, want %d");

	if (qid_ds.msg_ctime < t)

		t_error("qid_ds.msg_ctime >= t failed: got %ld, want %ld\n", (long)qid_ds.msg_ctime, (long)t);

	if (qid_ds.msg_qbytes <= 0)

		t_error("qid_ds.msg_qbytes > 0 failed: got %d, want 0\n", qid_ds.msg_qbytes, t);

	/* test send */

	T(msgsnd(qid, &msg, sizeof msg.data, IPC_NOWAIT));

	T(msgctl(qid, IPC_STAT, &qid_ds));

	EQ(qid_ds.msg_qnum, 1, "got %d, want %d");

	EQ(qid_ds.msg_lspid, getpid(), "got %d, want %d");

	if (qid_ds.msg_stime < t)

		t_error("msg_stime is %ld want >= %ld\n", (long)qid_ds.msg_stime, (long)t);

}

static void rcv()

{

	key_t k;

	int qid;

	struct {

		long type;

		char data[20];

	} msg;

	long msgtyp = 0;

	T(k = ftok(path, id));

	T(qid = msgget(k, 0));

	errno = 0;

	if (msgrcv(qid, &msg, 0, msgtyp, 0) != -1 || errno != E2BIG)

		t_error("msgrcv should have failed when msgsize==0 with E2BIG, got %s\n", strerror(errno));

	/* test receive */

	T(msgrcv(qid, &msg, sizeof msg.data, msgtyp, IPC_NOWAIT));

	if (strcmp(msg.data,"test message") != 0)

		t_error("received \"%s\" instead of \"%s\"\n", msg.data, "test message");

	errno = 0;

	if (msgrcv(qid, &msg, sizeof msg.data, msgtyp, MSG_NOERROR|IPC_NOWAIT) != -1 || errno != ENOMSG)

		t_error("msgrcv should have failed when ther is no msg with ENOMSG, got %s\n", strerror(errno));

	/* cleanup */

	T(msgctl(qid, IPC_RMID, 0));

}

int main(void)

{

	int p;

	int status;

	snd();

	p = fork();

	if (p == -1)

		t_error("fork failed: %s\n", strerror(errno));

	else if (p == 0)

		rcv();

	else {

		T(waitpid(p, &status, 0));

		if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)

			t_error("child exit status: %d\n", status);

	}

	return t_status;

}