1 | /* Copyright (C) 1995-2018 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 | <http://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 | # define DEFAULT_VERSION GLIBC_2_2 |
37 | #endif |
38 | |
39 | int |
40 | __new_semctl (int semid, int semnum, int cmd, ...) |
41 | { |
42 | union semun arg = { 0 }; |
43 | va_list ap; |
44 | |
45 | /* Get the argument only if required. */ |
46 | switch (cmd) |
47 | { |
48 | case SETVAL: /* arg.val */ |
49 | case GETALL: /* arg.array */ |
50 | case SETALL: |
51 | case IPC_STAT: /* arg.buf */ |
52 | case IPC_SET: |
53 | case SEM_STAT: |
54 | case IPC_INFO: /* arg.__buf */ |
55 | case SEM_INFO: |
56 | va_start (ap, cmd); |
57 | arg = va_arg (ap, union semun); |
58 | va_end (ap); |
59 | break; |
60 | } |
61 | |
62 | #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS |
63 | return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd | __IPC_64, |
64 | arg.array); |
65 | #else |
66 | return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd | __IPC_64, |
67 | SEMCTL_ARG_ADDRESS (arg)); |
68 | #endif |
69 | } |
70 | versioned_symbol (libc, __new_semctl, semctl, DEFAULT_VERSION); |
71 | |
72 | |
73 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
74 | /* Since semctl use a variadic argument for semid_ds there is not need to |
75 | define and tie the compatibility symbol to the old 'union semun' |
76 | definition. */ |
77 | int |
78 | attribute_compat_text_section |
79 | __old_semctl (int semid, int semnum, int cmd, ...) |
80 | { |
81 | union semun arg = { 0 }; |
82 | va_list ap; |
83 | |
84 | /* Get the argument only if required. */ |
85 | switch (cmd) |
86 | { |
87 | case SETVAL: /* arg.val */ |
88 | case GETALL: /* arg.array */ |
89 | case SETALL: |
90 | case IPC_STAT: /* arg.buf */ |
91 | case IPC_SET: |
92 | case SEM_STAT: |
93 | case IPC_INFO: /* arg.__buf */ |
94 | case SEM_INFO: |
95 | va_start (ap, cmd); |
96 | arg = va_arg (ap, union semun); |
97 | va_end (ap); |
98 | break; |
99 | } |
100 | |
101 | # ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS |
102 | return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd, arg.array); |
103 | # else |
104 | return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd, |
105 | SEMCTL_ARG_ADDRESS (arg)); |
106 | # endif |
107 | } |
108 | compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0); |
109 | #endif |
110 | |