ipc/syscall.c

   1 /*
   2  * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
   3  *
   4  * This is really horribly ugly, and new architectures should just wire up
   5  * the individual syscalls instead.
   6  */
   7 #include <linux/unistd.h>
   8
   9 #ifdef __ARCH_WANT_SYS_IPC
  10 #include <linux/errno.h>
  11 #include <linux/ipc.h>
  12 #include <linux/shm.h>
  13 #include <linux/syscalls.h>
  14 #include <linux/uaccess.h>
  15
  16 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
  17                 unsigned long, third, void __user *, ptr, long, fifth)
  18 {
  19         int version, ret;
  20
  21         version = call >> 16; /* hack for backward compatibility */
  22         call &= 0xffff;
  23
  24         switch (call) {
  25         case SEMOP:
  26                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
  27                                       second, NULL);
  28         case SEMTIMEDOP:
  29                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
  30                                       second,
  31                                       (const struct timespec __user *)fifth);
  32
  33         case SEMGET:
  34                 return sys_semget(first, second, third);
  35         case SEMCTL: {
  36                 union semun fourth;
  37                 if (!ptr)
  38                         return -EINVAL;
  39                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
  40                         return -EFAULT;
  41                 return sys_semctl(first, second, third, fourth);
  42         }
  43
  44         case MSGSND:
  45                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
  46                                   second, third);
  47         case MSGRCV:
  48                 switch (version) {
  49                 case 0: {
  50                         struct ipc_kludge tmp;
  51                         if (!ptr)
  52                                 return -EINVAL;
  53
  54                         if (copy_from_user(&tmp,
  55                                            (struct ipc_kludge __user *) ptr,
  56                                            sizeof(tmp)))
  57                                 return -EFAULT;
  58                         return sys_msgrcv(first, tmp.msgp, second,
  59                                            tmp.msgtyp, third);
  60                 }
  61                 default:
  62                         return sys_msgrcv(first,
  63                                            (struct msgbuf __user *) ptr,
  64                                            second, fifth, third);
  65                 }
  66         case MSGGET:
  67                 return sys_msgget((key_t) first, second);
  68         case MSGCTL:
  69                 return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
  70
  71         case SHMAT:
  72                 switch (version) {
  73                 default: {
  74                         unsigned long raddr;
  75                         ret = do_shmat(first, (char __user *)ptr,
  76                                        second, &raddr, SHMLBA);
  77                         if (ret)
  78                                 return ret;
  79                         return put_user(raddr, (unsigned long __user *) third);
  80                 }
  81                 case 1:
  82                         /*
  83                          * This was the entry point for kernel-originating calls
  84                          * from iBCS2 in 2.2 days.
  85                          */
  86                         return -EINVAL;
  87                 }
  88         case SHMDT:
  89                 return sys_shmdt((char __user *)ptr);
  90         case SHMGET:
  91                 return sys_shmget(first, second, third);
  92         case SHMCTL:
  93                 return sys_shmctl(first, second,
  94                                    (struct shmid_ds __user *) ptr);
  95         default:
  96                 return -ENOSYS;
  97         }
  98 }
  99 #endif