syscall.c revision 079a96ae
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		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
100