The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ipc/syscall.c

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    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

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