systemV 信号灯问题

仿照(Unix网络编程 第二卷第二版)的第11章SystemV信号灯 写了下面的程序，运行出现问题，请问原因，谢谢！
编译和运行都可以进行，但是设置信号灯集中的各信号灯值时显示信号灯集中的信号灯数目为nsems=4436512，显示值各信号灯值时显示信号灯数目为nsems=-1075867592，当然也没有设置成功了。 而我创建时明明创建成功了，设置成3个。
没有找到redhat下的原因，特请教。

代码比较长，不过去掉一些处理性的真正有用的只有不到十行，请耐心查看帮忙，谢谢！


代码1: semcreate.c

#include "../LinuxComm.h" //自己写的包含头文件.



int main(int argc , char ** argv)

{

	int c,oflag,semid,nsems;

	oflag =IPC_EXCL| IPC_CREAT;

	printf("Program start...\n");



	while( (c=getopt(argc,argv,"e"))!=-1 )

	{

		switch(c)

		{

			case 'e': oflag |=IPC_EXCL;

				break;

		}

	}

	if(optind!=argc-2)

	{		

		printf("Usage: semcreate [-e] <pathname> <nsems> ,Program will exit...\n");		

		exit(2);

	}

	printf("optind=%d, argc=%d\n",optind,argc);		



	nsems =atoi( argv[optind+1] );

	printf("nsems=%d\n",nsems);		

	semid =semget( ftok(argv[optind],0) , nsems , oflag );

	

	if(-1==semid)

	{

		printf("semget Failed,errno=%d, Program will exit...\n",errno);		

		exit(2);

	}

	

	printf("Program will exit...\n");	

	exit(0);

}

代码2: semsetvalues.c

#include "../LinuxComm.h"



int

main(int argc, char **argv)

{

	int		semid, nsems, i;

	struct semid_ds	seminfo;

	unsigned short	*ptr;

	union semun	arg;



	printf("Program start...\n");



	if (argc < 2)

	{

		printf("usage: semsetvalues <pathname> [ values ... ]\n");

		exit(0);

	}



		/* 4first get the number of semaphores in the set */

	semid = semget(ftok(argv[1], 0), 0, 0);

	arg.buf = &seminfo;

	semctl(semid, 0, IPC_STAT, arg);

	nsems = arg.buf->sem_nsems;

	printf("nsems=%d\n",nsems);	



		/* 4now get the values from the command line */

	if (argc != nsems + 2)

	{

		printf("%d semaphores in set, %d values specified\n", nsems, argc-2);

		exit(0);

	}



		/* 4allocate memory to hold all the values in the set, and store */

	ptr = calloc(nsems, sizeof(unsigned short));

	arg.array = ptr;

	for (i = 0; i < nsems; i++)

		ptr[i] = atoi(argv[i + 2]);

	semctl(semid, 0, SETALL, arg);



	printf("Program will exit...\n");	

	exit(0);

}

代码3: semgetvalues.c

#include "../LinuxComm.h"



int

main(int argc, char **argv)

{

	int		semid, nsems, i;

	struct semid_ds	seminfo;

	unsigned short	*ptr;

	union semun	arg;



	printf("Program start...\n");



	if (argc < 2)

	{

		printf("usage: semgetvalues <pathname>\n");

		exit(0);

	}



		/* 4first get the number of semaphores in the set */

	semid = semget(ftok(argv[1], 0), 0, 0);

	if(-1==semid)

	{

		printf("semget Failed,errno=%d, Program will exit...\n",errno);		

		exit(2);

	}

	else

		printf("semget succeeded!\n");

		

	arg.buf = &seminfo;

	semctl(semid, 0, IPC_STAT, arg);

	nsems = arg.buf->sem_nsems;



	printf("nsems=%d\n",nsems);		

	

		/* 4allocate memory to hold all the values in the set */

	ptr = calloc(nsems, sizeof(unsigned short));

	arg.array = ptr;



		/* 4fetch the values and print */

	semctl(semid, 0, GETALL, arg);

	for (i = 0; i < nsems; i++)

		printf("semval[%d] = %d\n", i, ptr[i]);



	printf("Program will exit...\n");	

	exit(0);

}

运行结果

[pro@rhel5 ~/lnxpro/sysvsema 02:46:57]$l

total 64

-rw-rw-r-- 1 pro pro  473 Apr 13 00:39 makefile

-rwxrwxr-x 1 pro pro 5893 Apr 13 02:43 semcreate

-rw-r--r-- 1 pro pro  732 Apr 13 02:42 semcreate.c

-rwxrwxr-x 1 pro pro 5876 Apr 13 02:43 semgetvalues

-rw-r--r-- 1 pro pro  976 Apr 13 02:43 semgetvalues.c

-rwxrwxr-x 1 pro pro 5871 Apr 13 00:44 semops

-rw-r--r-- 1 pro pro  971 Apr 13 00:44 semops.c

-rwxrwxr-x 1 pro pro 5291 Apr 13 00:39 semrmid

-rw-r--r-- 1 pro pro  325 Apr 13 00:35 semrmid.c

-rwxrwxr-x 1 pro pro 5824 Apr 13 02:10 semsetvalues

-rw-r--r-- 1 pro pro  968 Apr 13 02:10 semsetvalues.c

[pro@rhel5 ~/lnxpro/sysvsema 02:46:58]$./semcreate /tmp.path 3

Program start...

optind=1, argc=3

nsems=3

Program will exit...

[pro@rhel5 ~/lnxpro/sysvsema 02:47:07]$./semsetvalues /tmp.path

Program start...

nsems=4436512

4436512 semaphores in set, 0 values specified

[pro@rhel5 ~/lnxpro/sysvsema 02:47:19]$./semgetvalues /tmp.path

Program start...

semget succeeded!

nsems=-1075867592

Program will exit...

[pro@rhel5 ~/lnxpro/sysvsema 02:47:25]$