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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [mips/] [kernel/] [ipc.c] - Blame information for rev 1765

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1 199 simons 
/*
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 * linux/arch/mips/kernel/ipc.c
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 *
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 * This file contains various random system calls that
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 * have a non-standard calling sequence on the Linux/i386
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 * platform.
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 */
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <asm/segment.h>
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/*
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 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
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 *
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 * This is really horribly ugly;  removing this will need some minor
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 * changes in libc.
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 */
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asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
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{
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#ifdef CONFIG_SYSVIPC
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        int version;
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        version = call >> 16; /* hack for backward compatibility */
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        call &= 0xffff;
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        if (call <= SEMCTL)
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                switch (call) {
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                case SEMOP:
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                        return sys_semop (first, (struct sembuf *)ptr, second);
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                case SEMGET:
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                        return sys_semget (first, second, third);
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                case SEMCTL: {
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                        union semun fourth;
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                        int err;
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                        if (!ptr)
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                                return -EINVAL;
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                        if ((err = verify_area (VERIFY_READ, ptr, sizeof(long))))
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                                return err;
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                        fourth.__pad = (void *) get_fs_long(ptr);
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                        return sys_semctl (first, second, third, fourth);
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                        }
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                default:
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                        return -EINVAL;
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                }
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        if (call <= MSGCTL)
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                switch (call) {
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                case MSGSND:
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                        return sys_msgsnd (first, (struct msgbuf *) ptr,
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                                           second, third);
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                case MSGRCV:
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                        switch (version) {
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                        case 0: {
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                                struct ipc_kludge tmp;
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                                int err;
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                                if (!ptr)
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                                        return -EINVAL;
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                                if ((err = verify_area (VERIFY_READ, ptr, sizeof(tmp))))
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                                        return err;
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                                memcpy_fromfs (&tmp,(struct ipc_kludge *) ptr,
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                                               sizeof (tmp));
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                                return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
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                                }
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                        case 1: default:
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                                return sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
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                        }
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                case MSGGET:
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                        return sys_msgget ((key_t) first, second);
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                case MSGCTL:
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                        return sys_msgctl (first, second, (struct msqid_ds *) ptr);
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                default:
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                        return -EINVAL;
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                }
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        if (call <= SHMCTL)
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                switch (call) {
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                case SHMAT:
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                        switch (version) {
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                        case 0: default: {
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                                ulong raddr;
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                                int err;
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                                if ((err = verify_area(VERIFY_WRITE, (ulong*) third, sizeof(ulong))))
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                                        return err;
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                                err = sys_shmat (first, (char *) ptr, second, &raddr);
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                                if (err)
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                                        return err;
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                                put_fs_long (raddr, (ulong *) third);
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                                return 0;
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                                }
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                        case 1: /* iBCS2 emulator entry point */
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                                if (get_fs() != get_ds())
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                                        return -EINVAL;
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                                return sys_shmat (first, (char *) ptr, second, (ulong *) third);
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                        }
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                case SHMDT:
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                        return sys_shmdt ((char *)ptr);
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                case SHMGET:
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                        return sys_shmget (first, second, third);
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                case SHMCTL:
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                        return sys_shmctl (first, second, (struct shmid_ds *) ptr);
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                default:
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                        return -EINVAL;
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                }
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        return -EINVAL;
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#else /* CONFIG_SYSVIPC */
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        return -ENOSYS;
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#endif /* CONFIG_SYSVIPC */
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}

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