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/shm.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 | #ifndef DEFAULT_VERSION |
27 | # ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T |
28 | # define DEFAULT_VERSION GLIBC_2_2 |
29 | # else |
30 | # define DEFAULT_VERSION GLIBC_2_31 |
31 | # endif |
32 | #endif |
33 | |
34 | static int |
35 | shmctl_syscall (int shmid, int cmd, struct shmid_ds *buf) |
36 | { |
37 | #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS |
38 | return INLINE_SYSCALL_CALL (shmctl, shmid, cmd | __IPC_64, buf); |
39 | #else |
40 | return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd | __IPC_64, 0, |
41 | buf); |
42 | #endif |
43 | } |
44 | |
45 | /* Provide operations to control over shared memory segments. */ |
46 | int |
47 | __new_shmctl (int shmid, int cmd, struct shmid_ds *buf) |
48 | { |
49 | /* POSIX states ipc_perm mode should have type of mode_t. */ |
50 | _Static_assert (sizeof ((struct shmid_ds){0}.shm_perm.mode) |
51 | == sizeof (mode_t), |
52 | "sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)" ); |
53 | |
54 | #ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T |
55 | struct shmid_ds tmpds; |
56 | if (cmd == IPC_SET) |
57 | { |
58 | tmpds = *buf; |
59 | tmpds.shm_perm.mode *= 0x10000U; |
60 | buf = &tmpds; |
61 | } |
62 | #endif |
63 | |
64 | int ret = shmctl_syscall (shmid, cmd, buf); |
65 | |
66 | #ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T |
67 | if (ret >= 0) |
68 | { |
69 | switch (cmd) |
70 | { |
71 | case IPC_STAT: |
72 | case SHM_STAT: |
73 | case SHM_STAT_ANY: |
74 | buf->shm_perm.mode >>= 16; |
75 | } |
76 | } |
77 | #endif |
78 | |
79 | return ret; |
80 | } |
81 | versioned_symbol (libc, __new_shmctl, shmctl, DEFAULT_VERSION); |
82 | |
83 | #if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \ |
84 | && SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31) |
85 | int |
86 | attribute_compat_text_section |
87 | __shmctl_mode16 (int shmid, int cmd, struct shmid_ds *buf) |
88 | { |
89 | return shmctl_syscall (shmid, cmd, buf); |
90 | } |
91 | compat_symbol (libc, __shmctl_mode16, shmctl, GLIBC_2_2); |
92 | #endif |
93 | |
94 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
95 | struct __old_shmid_ds |
96 | { |
97 | struct __old_ipc_perm shm_perm; /* operation permission struct */ |
98 | int shm_segsz; /* size of segment in bytes */ |
99 | __time_t shm_atime; /* time of last shmat() */ |
100 | __time_t shm_dtime; /* time of last shmdt() */ |
101 | __time_t shm_ctime; /* time of last change by shmctl() */ |
102 | __ipc_pid_t shm_cpid; /* pid of creator */ |
103 | __ipc_pid_t shm_lpid; /* pid of last shmop */ |
104 | unsigned short int shm_nattch; /* number of current attaches */ |
105 | unsigned short int __shm_npages; /* size of segment (pages) */ |
106 | unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */ |
107 | struct vm_area_struct *__attaches; /* descriptors for attaches */ |
108 | }; |
109 | |
110 | int |
111 | attribute_compat_text_section |
112 | __old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf) |
113 | { |
114 | #if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \ |
115 | && !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64 |
116 | /* For architecture that have wire-up shmctl but also have __IPC_64 to a |
117 | value different than default (0x0), it means the compat symbol used the |
118 | __NR_ipc syscall. */ |
119 | return INLINE_SYSCALL_CALL (shmctl, shmid, cmd, buf); |
120 | #else |
121 | return INLINE_SYSCALL_CALL (ipc, IPCOP_shmctl, shmid, cmd, 0, buf); |
122 | #endif |
123 | } |
124 | compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0); |
125 | #endif |
126 | |