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Linux/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                 unsigned long arg;
 37                 if (!ptr)
 38                         return -EINVAL;
 39                 if (get_user(arg, (unsigned long __user *) ptr))
 40                         return -EFAULT;
 41                 return sys_semctl(first, second, third, arg);
 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
100 

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