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1 | /* Copyright (C) 1995, 1997, 1998, 2000 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <stdarg.h> | |
22 | #include <sys/sem.h> | |
23 | #include <ipc_priv.h> | |
24 | ||
25 | #include <sysdep.h> | |
26 | #include <string.h> | |
27 | #include <sys/syscall.h> | |
28 | ||
29 | #include "kernel-features.h" | |
b5567b2a | 30 | #include <shlib-compat.h> |
cd090f71 UD |
31 | |
32 | struct __old_semid_ds | |
33 | { | |
34 | struct __old_ipc_perm sem_perm; /* operation permission struct */ | |
35 | __time_t sem_otime; /* last semop() time */ | |
36 | __time_t sem_ctime; /* last time changed by semctl() */ | |
37 | struct sem *__sembase; /* ptr to first semaphore in array */ | |
38 | struct sem_queue *__sem_pending; /* pending operations */ | |
39 | struct sem_queue *__sem_pending_last; /* last pending operation */ | |
40 | struct sem_undo *__undo; /* ondo requests on this array */ | |
41 | unsigned short int sem_nsems; /* number of semaphores in set */ | |
42 | }; | |
43 | ||
44 | /* Define a `union semun' suitable for Linux here. */ | |
45 | union semun | |
46 | { | |
47 | int val; /* value for SETVAL */ | |
48 | struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ | |
49 | unsigned short int *array; /* array for GETALL & SETALL */ | |
50 | struct seminfo *__buf; /* buffer for IPC_INFO */ | |
51 | }; | |
52 | ||
d25c879d GM |
53 | #include <bp-checks.h> |
54 | #include <bp-semctl.h> /* definition of CHECK_SEMCTL needs union semum */ | |
55 | ||
cd090f71 UD |
56 | #ifdef __NR_getuid32 |
57 | # if __ASSUME_32BITUIDS == 0 | |
58 | /* This variable is shared with all files that need to check for 32bit | |
59 | uids. */ | |
60 | extern int __libc_missing_32bit_uids; | |
61 | # endif | |
62 | #endif | |
63 | ||
64 | /* Return identifier for array of NSEMS semaphores associated with | |
65 | KEY. */ | |
b5567b2a | 66 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
cd090f71 | 67 | int __old_semctl (int semid, int semnum, int cmd, ...); |
b5567b2a | 68 | #endif |
cd090f71 UD |
69 | int __new_semctl (int semid, int semnum, int cmd, ...); |
70 | ||
b5567b2a | 71 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
cd090f71 UD |
72 | int |
73 | __old_semctl (int semid, int semnum, int cmd, ...) | |
74 | { | |
75 | union semun arg; | |
76 | va_list ap; | |
77 | ||
78 | va_start (ap, cmd); | |
79 | ||
80 | /* Get the argument. */ | |
81 | arg = va_arg (ap, union semun); | |
82 | ||
83 | va_end (ap); | |
84 | ||
d25c879d GM |
85 | return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, |
86 | CHECK_SEMCTL (&arg, semid, cmd)); | |
cd090f71 | 87 | } |
b5567b2a UD |
88 | compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0); |
89 | #endif | |
cd090f71 UD |
90 | |
91 | int | |
92 | __new_semctl (int semid, int semnum, int cmd, ...) | |
93 | { | |
94 | union semun arg; | |
95 | va_list ap; | |
96 | ||
97 | va_start (ap, cmd); | |
98 | ||
99 | /* Get the argument. */ | |
100 | arg = va_arg (ap, union semun); | |
101 | ||
102 | va_end (ap); | |
103 | ||
104 | #if __ASSUME_32BITUIDS > 0 | |
d25c879d GM |
105 | return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64, |
106 | CHECK_SEMCTL (&arg, semid, cmd | __IPC_64)); | |
cd090f71 UD |
107 | #else |
108 | switch (cmd) { | |
109 | case SEM_STAT: | |
110 | case IPC_STAT: | |
111 | case IPC_SET: | |
112 | break; | |
113 | default: | |
d25c879d GM |
114 | return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, |
115 | CHECK_SEMCTL (&arg, semid, cmd)); | |
cd090f71 UD |
116 | } |
117 | ||
118 | { | |
46661856 | 119 | int result; |
cd090f71 UD |
120 | struct __old_semid_ds old; |
121 | struct semid_ds *buf; | |
122 | ||
123 | #ifdef __NR_getuid32 | |
124 | if (__libc_missing_32bit_uids <= 0) | |
125 | { | |
126 | if (__libc_missing_32bit_uids < 0) | |
127 | { | |
46661856 | 128 | int save_errno = errno; |
cd090f71 UD |
129 | |
130 | /* Test presence of new IPC by testing for getuid32 syscall. */ | |
131 | result = INLINE_SYSCALL (getuid32, 0); | |
132 | if (result == -1 && errno == ENOSYS) | |
133 | __libc_missing_32bit_uids = 1; | |
134 | else | |
135 | __libc_missing_32bit_uids = 0; | |
136 | __set_errno(save_errno); | |
137 | } | |
138 | if (__libc_missing_32bit_uids <= 0) | |
139 | { | |
d25c879d GM |
140 | result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64, |
141 | CHECK_SEMCTL (&arg, semid, cmd | __IPC_64)); | |
cd090f71 UD |
142 | return result; |
143 | } | |
144 | } | |
145 | #endif | |
146 | ||
147 | buf = arg.buf; | |
148 | arg.buf = (struct semid_ds *)&old; | |
149 | if (cmd == IPC_SET) | |
150 | { | |
151 | old.sem_perm.uid = buf->sem_perm.uid; | |
152 | old.sem_perm.gid = buf->sem_perm.gid; | |
153 | old.sem_perm.mode = buf->sem_perm.mode; | |
154 | if (old.sem_perm.uid != buf->sem_perm.uid || | |
155 | old.sem_perm.gid != buf->sem_perm.gid) | |
156 | { | |
157 | __set_errno (EINVAL); | |
158 | return -1; | |
159 | } | |
160 | } | |
d25c879d GM |
161 | result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, |
162 | CHECK_SEMCTL (&arg, semid, cmd)); | |
cd090f71 UD |
163 | if (result != -1 && cmd != IPC_SET) |
164 | { | |
165 | memset(buf, 0, sizeof(*buf)); | |
166 | buf->sem_perm.__key = old.sem_perm.__key; | |
167 | buf->sem_perm.uid = old.sem_perm.uid; | |
168 | buf->sem_perm.gid = old.sem_perm.gid; | |
169 | buf->sem_perm.cuid = old.sem_perm.cuid; | |
170 | buf->sem_perm.cgid = old.sem_perm.cgid; | |
171 | buf->sem_perm.mode = old.sem_perm.mode; | |
172 | buf->sem_perm.__seq = old.sem_perm.__seq; | |
173 | buf->sem_otime = old.sem_otime; | |
174 | buf->sem_ctime = old.sem_ctime; | |
175 | buf->sem_nsems = old.sem_nsems; | |
176 | } | |
177 | return result; | |
178 | } | |
179 | #endif | |
180 | } | |
181 | ||
b5567b2a | 182 | versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2); |