| 1 | /* |
| 2 | * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. |
| 3 | * |
| 4 | * @APPLE_LICENSE_HEADER_START@ |
| 5 | * |
| 6 | * This file contains Original Code and/or Modifications of Original Code |
| 7 | * as defined in and that are subject to the Apple Public Source License |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in |
| 9 | * compliance with the License. Please obtain a copy of the License at |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| 11 | * file. |
| 12 | * |
| 13 | * The Original Code and all software distributed under the License are |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 18 | * Please see the License for the specific language governing rights and |
| 19 | * limitations under the License. |
| 20 | * |
| 21 | * @APPLE_LICENSE_HEADER_END@ |
| 22 | */ |
| 23 | #include <unistd.h> |
| 24 | #include <stdarg.h> |
| 25 | #include <sys/sem.h> |
| 26 | |
| 27 | #include <errno.h> |
| 28 | /* |
| 29 | * Because KERNEL is defined, including errno.h doesn't define errno, so |
| 30 | * we have to do it ourselves. |
| 31 | */ |
| 32 | extern int * __error(void); |
| 33 | #define errno (*__error()) |
| 34 | |
| 35 | /* |
| 36 | * Legacy stub to account for the differences in the ipc_perm structure, |
| 37 | * while maintaining binary backward compatibility. |
| 38 | */ |
| 39 | extern int __semctl(int semid, int semnum, int cmd, void *); |
| 40 | |
| 41 | int |
| 42 | semctl(int semid, int semnum, int cmd, ...) |
| 43 | { |
| 44 | va_list ap; |
| 45 | int rv; |
| 46 | int val = 0; |
| 47 | struct __semid_ds_new ds; |
| 48 | struct __semid_ds_new *ds_new = &ds; |
| 49 | struct __semid_ds_old *ds_old = NULL; |
| 50 | |
| 51 | va_start(ap, cmd); |
| 52 | if (cmd == SETVAL) |
| 53 | val = va_arg(ap, int); |
| 54 | else |
| 55 | ds_old = va_arg(ap, struct __semid_ds_old *); |
| 56 | va_end(ap); |
| 57 | |
| 58 | #define _UP_CVT(x) ds_new-> x = ds_old-> x |
| 59 | #define _DN_CVT(x) ds_old-> x = ds_new-> x |
| 60 | |
| 61 | if ((cmd == IPC_SET || cmd == IPC_STAT) && ds_old == NULL) { |
| 62 | /* Return EFAULT if ds_old is NULL (like the kernel would do) */ |
| 63 | errno = EFAULT; |
| 64 | return -1; |
| 65 | } |
| 66 | if (cmd == IPC_SET) { |
| 67 | /* convert before call */ |
| 68 | _UP_CVT(sem_perm.uid); |
| 69 | _UP_CVT(sem_perm.gid); |
| 70 | _UP_CVT(sem_perm.cuid); |
| 71 | _UP_CVT(sem_perm.cgid); |
| 72 | _UP_CVT(sem_perm.mode); |
| 73 | ds_new->sem_perm._seq = ds_old->sem_perm.seq; |
| 74 | ds_new->sem_perm._key = ds_old->sem_perm.key; |
| 75 | _UP_CVT(sem_base); |
| 76 | _UP_CVT(sem_nsems); |
| 77 | _UP_CVT(sem_otime); |
| 78 | _UP_CVT(sem_pad1); /* binary compatibility */ |
| 79 | _UP_CVT(sem_ctime); |
| 80 | _UP_CVT(sem_pad2); /* binary compatibility */ |
| 81 | _UP_CVT(sem_pad3[0]); /* binary compatibility */ |
| 82 | _UP_CVT(sem_pad3[1]); /* binary compatibility */ |
| 83 | _UP_CVT(sem_pad3[2]); /* binary compatibility */ |
| 84 | _UP_CVT(sem_pad3[3]); /* binary compatibility */ |
| 85 | } |
| 86 | switch (cmd) { |
| 87 | case SETVAL: |
| 88 | /* syscall must use LP64 quantities */ |
| 89 | rv = __semctl(semid, semnum, cmd, (void *)val); |
| 90 | break; |
| 91 | case IPC_SET: |
| 92 | case IPC_STAT: |
| 93 | rv = __semctl(semid, semnum, cmd, ds_new); |
| 94 | break; |
| 95 | default: |
| 96 | rv = __semctl(semid, semnum, cmd, ds_old); |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | if (cmd == IPC_STAT) { |
| 101 | /* convert after call */ |
| 102 | _DN_CVT(sem_perm.uid); /* warning! precision loss! */ |
| 103 | _DN_CVT(sem_perm.gid); /* warning! precision loss! */ |
| 104 | _DN_CVT(sem_perm.cuid); /* warning! precision loss! */ |
| 105 | _DN_CVT(sem_perm.cgid); /* warning! precision loss! */ |
| 106 | _DN_CVT(sem_perm.mode); |
| 107 | ds_old->sem_perm.seq = ds_new->sem_perm._seq; |
| 108 | ds_old->sem_perm.key = ds_new->sem_perm._key; |
| 109 | _DN_CVT(sem_base); |
| 110 | _DN_CVT(sem_nsems); |
| 111 | _DN_CVT(sem_otime); |
| 112 | _DN_CVT(sem_pad1); /* binary compatibility */ |
| 113 | _DN_CVT(sem_ctime); |
| 114 | _DN_CVT(sem_pad2); /* binary compatibility */ |
| 115 | _DN_CVT(sem_pad3[0]); /* binary compatibility */ |
| 116 | _DN_CVT(sem_pad3[1]); /* binary compatibility */ |
| 117 | _DN_CVT(sem_pad3[2]); /* binary compatibility */ |
| 118 | _DN_CVT(sem_pad3[3]); /* binary compatibility */ |
| 119 | } |
| 120 | |
| 121 | return (rv); |
| 122 | } |