syscall.c

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/*
 * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
 *
 * This is really horribly ugly, and new architectures should just wire up
 * the individual syscalls instead.
 */
#include <linux/unistd.h>

#ifdef __ARCH_WANT_SYS_IPC
#include <linux/errno.h>
#include <linux/ipc.h>
#include <linux/shm.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>

SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
        unsigned long, third, void __user *, ptr, long, fifth)
{
    int version, ret;

    version = call >> 16; /* hack for backward compatibility */
    call &= 0xffff;

    switch (call) {
    case SEMOP:
        return sys_semtimedop(first, (struct sembuf __user *)ptr,
                      second, NULL);
    case SEMTIMEDOP:
        return sys_semtimedop(first, (struct sembuf __user *)ptr,
                      second,
                      (const struct timespec __user *)fifth);

    case SEMGET:
        return sys_semget(first, second, third);
    case SEMCTL: {
        union semun fourth;
        if (!ptr)
            return -EINVAL;
        if (get_user(fourth.__pad, (void __user * __user *) ptr))
            return -EFAULT;
        return sys_semctl(first, second, third, fourth);
    }

    case MSGSND:
        return sys_msgsnd(first, (struct msgbuf __user *) ptr,
                  second, third);
    case MSGRCV:
        switch (version) {
        case 0: {
            struct ipc_kludge tmp;
            if (!ptr)
                return -EINVAL;

            if (copy_from_user(&tmp,
                       (struct ipc_kludge __user *) ptr,
                       sizeof(tmp)))
                return -EFAULT;
            return sys_msgrcv(first, tmp.msgp, second,
                       tmp.msgtyp, third);
        }
        default:
            return sys_msgrcv(first,
                       (struct msgbuf __user *) ptr,
                       second, fifth, third);
        }
    case MSGGET:
        return sys_msgget((key_t) first, second);
    case MSGCTL:
        return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);

    case SHMAT:
        switch (version) {
        default: {
            unsigned long raddr;
            ret = do_shmat(first, (char __user *)ptr,
                       second, &raddr, SHMLBA);
            if (ret)
                return ret;
            return put_user(raddr, (unsigned long __user *) third);
        }
        case 1:
            /*
             * This was the entry point for kernel-originating calls
             * from iBCS2 in 2.2 days.
             */
            return -EINVAL;
        }
    case SHMDT:
        return sys_shmdt((char __user *)ptr);
    case SHMGET:
        return sys_shmget(first, second, third);
    case SHMCTL:
        return sys_shmctl(first, second,
                   (struct shmid_ds __user *) ptr);
    default:
        return -ENOSYS;
    }
}
#endif