1 | /* Copyright (C) 1995-2020 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 Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the 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 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sys/sem.h> |
20 | #include <stdarg.h> |
21 | #include <ipc_priv.h> |
22 | #include <sysdep.h> |
23 | #include <shlib-compat.h> |
24 | #include <errno.h> |
25 | |
26 | /* Define a `union semun' suitable for Linux here. */ |
27 | union semun |
28 | { |
29 | int val; /* value for SETVAL */ |
30 | struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ |
31 | unsigned short int *array; /* array for GETALL & SETALL */ |
32 | struct seminfo *__buf; /* buffer for IPC_INFO */ |
33 | }; |
34 | |
35 | #ifndef DEFAULT_VERSION |
36 | # ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T |
37 | # define DEFAULT_VERSION GLIBC_2_2 |
38 | # else |
39 | # define DEFAULT_VERSION GLIBC_2_31 |
40 | # endif |
41 | #endif |
42 | |
43 | static int |
44 | semctl_syscall (int semid, int semnum, int cmd, union semun arg) |
45 | { |
46 | #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS |
47 | return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd | __IPC_64, |
48 | arg.array); |
49 | #else |
50 | return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd | __IPC_64, |
51 | SEMCTL_ARG_ADDRESS (arg)); |
52 | #endif |
53 | } |
54 | |
55 | int |
56 | __new_semctl (int semid, int semnum, int cmd, ...) |
57 | { |
58 | /* POSIX states ipc_perm mode should have type of mode_t. */ |
59 | _Static_assert (sizeof ((struct semid_ds){0}.sem_perm.mode) |
60 | == sizeof (mode_t), |
61 | "sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)" ); |
62 | |
63 | union semun arg = { 0 }; |
64 | va_list ap; |
65 | |
66 | /* Get the argument only if required. */ |
67 | switch (cmd) |
68 | { |
69 | case SETVAL: /* arg.val */ |
70 | case GETALL: /* arg.array */ |
71 | case SETALL: |
72 | case IPC_STAT: /* arg.buf */ |
73 | case IPC_SET: |
74 | case SEM_STAT: |
75 | case IPC_INFO: /* arg.__buf */ |
76 | case SEM_INFO: |
77 | va_start (ap, cmd); |
78 | arg = va_arg (ap, union semun); |
79 | va_end (ap); |
80 | break; |
81 | } |
82 | |
83 | #ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T |
84 | struct semid_ds tmpds; |
85 | if (cmd == IPC_SET) |
86 | { |
87 | tmpds = *arg.buf; |
88 | tmpds.sem_perm.mode *= 0x10000U; |
89 | arg.buf = &tmpds; |
90 | } |
91 | #endif |
92 | |
93 | int ret = semctl_syscall (semid, semnum, cmd, arg); |
94 | |
95 | #ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T |
96 | if (ret >= 0) |
97 | { |
98 | switch (cmd) |
99 | { |
100 | case IPC_STAT: |
101 | case SEM_STAT: |
102 | case SEM_STAT_ANY: |
103 | arg.buf->sem_perm.mode >>= 16; |
104 | } |
105 | } |
106 | #endif |
107 | |
108 | return ret; |
109 | } |
110 | versioned_symbol (libc, __new_semctl, semctl, DEFAULT_VERSION); |
111 | |
112 | #if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \ |
113 | && SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31) |
114 | int |
115 | attribute_compat_text_section |
116 | __semctl_mode16 (int semid, int semnum, int cmd, ...) |
117 | { |
118 | union semun arg = { 0 }; |
119 | va_list ap; |
120 | |
121 | /* Get the argument only if required. */ |
122 | switch (cmd) |
123 | { |
124 | case SETVAL: /* arg.val */ |
125 | case GETALL: /* arg.array */ |
126 | case SETALL: |
127 | case IPC_STAT: /* arg.buf */ |
128 | case IPC_SET: |
129 | case SEM_STAT: |
130 | case IPC_INFO: /* arg.__buf */ |
131 | case SEM_INFO: |
132 | va_start (ap, cmd); |
133 | arg = va_arg (ap, union semun); |
134 | va_end (ap); |
135 | break; |
136 | } |
137 | |
138 | return semctl_syscall (semid, semnum, cmd, arg); |
139 | } |
140 | compat_symbol (libc, __semctl_mode16, semctl, GLIBC_2_2); |
141 | #endif |
142 | |
143 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
144 | /* Since semctl use a variadic argument for semid_ds there is not need to |
145 | define and tie the compatibility symbol to the old 'union semun' |
146 | definition. */ |
147 | int |
148 | attribute_compat_text_section |
149 | __old_semctl (int semid, int semnum, int cmd, ...) |
150 | { |
151 | union semun arg = { 0 }; |
152 | va_list ap; |
153 | |
154 | /* Get the argument only if required. */ |
155 | switch (cmd) |
156 | { |
157 | case SETVAL: /* arg.val */ |
158 | case GETALL: /* arg.array */ |
159 | case SETALL: |
160 | case IPC_STAT: /* arg.buf */ |
161 | case IPC_SET: |
162 | case SEM_STAT: |
163 | case IPC_INFO: /* arg.__buf */ |
164 | case SEM_INFO: |
165 | va_start (ap, cmd); |
166 | arg = va_arg (ap, union semun); |
167 | va_end (ap); |
168 | break; |
169 | } |
170 | |
171 | #if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \ |
172 | && !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64 |
173 | /* For architectures that have wire-up semctl but also have __IPC_64 to a |
174 | value different than default (0x0) it means the compat symbol used the |
175 | __NR_ipc syscall. */ |
176 | return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd, arg.array); |
177 | # else |
178 | return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd, |
179 | SEMCTL_ARG_ADDRESS (arg)); |
180 | # endif |
181 | } |
182 | compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0); |
183 | #endif |
184 | |