Fix pathconf statvfs namespace (bug 18507).
[glibc.git] / sysdeps / unix / sysv / linux / shmctl.c
blob76d2b1fbd1e0fa0a817aebaa4a33fadaa59885df
1 /* Copyright (C) 1995-2015 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.
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.
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.
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/>. */
19 #include <errno.h>
20 #include <sys/shm.h>
21 #include <ipc_priv.h>
23 #include <sysdep.h>
24 #include <string.h>
25 #include <sys/syscall.h>
26 #include <bits/wordsize.h>
27 #include <shlib-compat.h>
29 #include <kernel-features.h>
31 struct __old_shmid_ds
33 struct __old_ipc_perm shm_perm; /* operation permission struct */
34 int shm_segsz; /* size of segment in bytes */
35 __time_t shm_atime; /* time of last shmat() */
36 __time_t shm_dtime; /* time of last shmdt() */
37 __time_t shm_ctime; /* time of last change by shmctl() */
38 __ipc_pid_t shm_cpid; /* pid of creator */
39 __ipc_pid_t shm_lpid; /* pid of last shmop */
40 unsigned short int shm_nattch; /* number of current attaches */
41 unsigned short int __shm_npages; /* size of segment (pages) */
42 unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */
43 struct vm_area_struct *__attaches; /* descriptors for attaches */
46 struct __old_shminfo
48 int shmmax;
49 int shmmin;
50 int shmmni;
51 int shmseg;
52 int shmall;
55 /* Provide operations to control over shared memory segments. */
56 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
57 int __old_shmctl (int, int, struct __old_shmid_ds *);
58 #endif
59 int __new_shmctl (int, int, struct shmid_ds *);
61 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
62 int
63 attribute_compat_text_section
64 __old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf)
66 return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf);
68 compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0);
69 #endif
71 int
72 __new_shmctl (int shmid, int cmd, struct shmid_ds *buf)
74 #if __ASSUME_IPC64 > 0
75 return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0,
76 buf);
77 #else
78 switch (cmd) {
79 case SHM_STAT:
80 case IPC_STAT:
81 case IPC_SET:
82 #if __WORDSIZE != 32
83 case IPC_INFO:
84 #endif
85 break;
86 default:
87 return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf);
91 int save_errno = errno, result;
92 union
94 struct __old_shmid_ds ds;
95 struct __old_shminfo info;
96 } old;
98 /* Unfortunately there is no way how to find out for sure whether
99 we should use old or new shmctl. */
100 result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0,
101 buf);
102 if (result != -1 || errno != EINVAL)
103 return result;
105 __set_errno(save_errno);
106 if (cmd == IPC_SET)
108 old.ds.shm_perm.uid = buf->shm_perm.uid;
109 old.ds.shm_perm.gid = buf->shm_perm.gid;
110 old.ds.shm_perm.mode = buf->shm_perm.mode;
111 if (old.ds.shm_perm.uid != buf->shm_perm.uid ||
112 old.ds.shm_perm.gid != buf->shm_perm.gid)
114 __set_errno (EINVAL);
115 return -1;
118 result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, &old.ds);
119 if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT))
121 memset(buf, 0, sizeof(*buf));
122 buf->shm_perm.__key = old.ds.shm_perm.__key;
123 buf->shm_perm.uid = old.ds.shm_perm.uid;
124 buf->shm_perm.gid = old.ds.shm_perm.gid;
125 buf->shm_perm.cuid = old.ds.shm_perm.cuid;
126 buf->shm_perm.cgid = old.ds.shm_perm.cgid;
127 buf->shm_perm.mode = old.ds.shm_perm.mode;
128 buf->shm_perm.__seq = old.ds.shm_perm.__seq;
129 buf->shm_atime = old.ds.shm_atime;
130 buf->shm_dtime = old.ds.shm_dtime;
131 buf->shm_ctime = old.ds.shm_ctime;
132 buf->shm_segsz = old.ds.shm_segsz;
133 buf->shm_nattch = old.ds.shm_nattch;
134 buf->shm_cpid = old.ds.shm_cpid;
135 buf->shm_lpid = old.ds.shm_lpid;
137 #if __WORDSIZE != 32
138 else if (result != -1 && cmd == IPC_INFO)
140 struct shminfo *i = (struct shminfo *)buf;
142 memset(i, 0, sizeof(*i));
143 i->shmmax = old.info.shmmax;
144 i->shmmin = old.info.shmmin;
145 i->shmmni = old.info.shmmni;
146 i->shmseg = old.info.shmseg;
147 i->shmall = old.info.shmall;
149 #endif
150 return result;
152 #endif
155 versioned_symbol (libc, __new_shmctl, shmctl, GLIBC_2_2);