problems when use semaphore in kernel mode

[202.105.138.19_[pirate@sina.com]]

Hi, all,

Would you please have a look to the following code for me? This code has no compile error, but it will get an error message "unresolved symbol sys_semctl". I don't know why.

/* gcc -c -Wall test.c*/


#define __KERNEL__
#define MODULE

#include <linux/module.h>
#include <linux/kernel.h>

#include <linux/string.h>
#include <linux/types.h>
#include <linux/ipc.h>
#include <linux/sem.h>
#include <linux/slab.h> /*kmalloc(), kfree()*/
#include <linux/stat.h>

#include <asm/types.h>
#include <asm/ipc.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>

key_t ftok(path, id)
const char *path;
char id;
{
struct stat st;

/* if (stat(path, &st) < 0)
return (key_t)-1;*/

return (key_t) (id << 24 | (st.st_dev & 0xff) << 16 | (st.st_ino & 0xfff
));
}

init_module()
{
int i;
int AgentLock;
union semun options;
key_t MyKey = ftok( ".", "xyz" );
AgentLock = sys_semget( MyKey, 5, IPC_CREAT | IPC_EXCL );

options.val = 1;
for( i = 0; i < 5; i++ )
sys_semctl( AgentLock, i, SETVAL, options );
}

==================================
Poster's IP address: 202.105.138.19
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[Kasper Dupont]

202.105.138.19, [pir...@sina.com] wrote:
>
> "unresolved symbol sys_semctl".

http://www.daimi.au.dk/~kasperd/comp.os.linux.development.faq.html#unresolved

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