Root/ipc/syscall.c

Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 7 years 11 months ago.
By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it
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
16SYSCALL_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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