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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [mips/] [kernel/] [ipc.c] - Rev 1624
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/* * linux/arch/mips/kernel/ipc.c * * This file contains various random system calls that * have a non-standard calling sequence on the Linux/i386 * platform. */ #include <linux/config.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <asm/segment.h> /* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly; removing this will need some minor * changes in libc. */ asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth) { #ifdef CONFIG_SYSVIPC int version; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; if (call <= SEMCTL) switch (call) { case SEMOP: return sys_semop (first, (struct sembuf *)ptr, second); case SEMGET: return sys_semget (first, second, third); case SEMCTL: { union semun fourth; int err; if (!ptr) return -EINVAL; if ((err = verify_area (VERIFY_READ, ptr, sizeof(long)))) return err; fourth.__pad = (void *) get_fs_long(ptr); return sys_semctl (first, second, third, fourth); } default: return -EINVAL; } if (call <= MSGCTL) switch (call) { case MSGSND: return sys_msgsnd (first, (struct msgbuf *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; int err; if (!ptr) return -EINVAL; if ((err = verify_area (VERIFY_READ, ptr, sizeof(tmp)))) return err; memcpy_fromfs (&tmp,(struct ipc_kludge *) ptr, sizeof (tmp)); return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); } case 1: default: return sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third); } case MSGGET: return sys_msgget ((key_t) first, second); case MSGCTL: return sys_msgctl (first, second, (struct msqid_ds *) ptr); default: return -EINVAL; } if (call <= SHMCTL) switch (call) { case SHMAT: switch (version) { case 0: default: { ulong raddr; int err; if ((err = verify_area(VERIFY_WRITE, (ulong*) third, sizeof(ulong)))) return err; err = sys_shmat (first, (char *) ptr, second, &raddr); if (err) return err; put_fs_long (raddr, (ulong *) third); return 0; } case 1: /* iBCS2 emulator entry point */ if (get_fs() != get_ds()) return -EINVAL; return sys_shmat (first, (char *) ptr, second, (ulong *) third); } case SHMDT: return sys_shmdt ((char *)ptr); case SHMGET: return sys_shmget (first, second, third); case SHMCTL: return sys_shmctl (first, second, (struct shmid_ds *) ptr); default: return -EINVAL; } return -EINVAL; #else /* CONFIG_SYSVIPC */ return -ENOSYS; #endif /* CONFIG_SYSVIPC */ }
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