| /* Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <sys/shm.h> |
| #include <ipc_priv.h> |
| |
| #include <sysdep.h> |
| #include <string.h> |
| #include <sys/syscall.h> |
| #include <bits/wordsize.h> |
| #include <shlib-compat.h> |
| |
| #include <kernel-features.h> |
| |
| struct __old_shmid_ds |
| { |
| struct __old_ipc_perm shm_perm; /* operation permission struct */ |
| int shm_segsz; /* size of segment in bytes */ |
| __time_t shm_atime; /* time of last shmat() */ |
| __time_t shm_dtime; /* time of last shmdt() */ |
| __time_t shm_ctime; /* time of last change by shmctl() */ |
| __ipc_pid_t shm_cpid; /* pid of creator */ |
| __ipc_pid_t shm_lpid; /* pid of last shmop */ |
| unsigned short int shm_nattch; /* number of current attaches */ |
| unsigned short int __shm_npages; /* size of segment (pages) */ |
| unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */ |
| struct vm_area_struct *__attaches; /* descriptors for attaches */ |
| }; |
| |
| struct __old_shminfo |
| { |
| int shmmax; |
| int shmmin; |
| int shmmni; |
| int shmseg; |
| int shmall; |
| }; |
| |
| /* Provide operations to control over shared memory segments. */ |
| #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
| int __old_shmctl (int, int, struct __old_shmid_ds *); |
| #endif |
| int __new_shmctl (int, int, struct shmid_ds *); |
| |
| #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
| int |
| attribute_compat_text_section |
| __old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf) |
| { |
| return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf); |
| } |
| compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0); |
| #endif |
| |
| int |
| __new_shmctl (int shmid, int cmd, struct shmid_ds *buf) |
| { |
| #if __ASSUME_IPC64 > 0 |
| return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0, |
| buf); |
| #else |
| switch (cmd) { |
| case SHM_STAT: |
| case IPC_STAT: |
| case IPC_SET: |
| #if __WORDSIZE != 32 |
| case IPC_INFO: |
| #endif |
| break; |
| default: |
| return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf); |
| } |
| |
| { |
| int save_errno = errno, result; |
| union |
| { |
| struct __old_shmid_ds ds; |
| struct __old_shminfo info; |
| } old; |
| |
| /* Unfortunately there is no way how to find out for sure whether |
| we should use old or new shmctl. */ |
| result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0, |
| buf); |
| if (result != -1 || errno != EINVAL) |
| return result; |
| |
| __set_errno(save_errno); |
| if (cmd == IPC_SET) |
| { |
| old.ds.shm_perm.uid = buf->shm_perm.uid; |
| old.ds.shm_perm.gid = buf->shm_perm.gid; |
| old.ds.shm_perm.mode = buf->shm_perm.mode; |
| if (old.ds.shm_perm.uid != buf->shm_perm.uid || |
| old.ds.shm_perm.gid != buf->shm_perm.gid) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| } |
| result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, &old.ds); |
| if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT)) |
| { |
| memset(buf, 0, sizeof(*buf)); |
| buf->shm_perm.__key = old.ds.shm_perm.__key; |
| buf->shm_perm.uid = old.ds.shm_perm.uid; |
| buf->shm_perm.gid = old.ds.shm_perm.gid; |
| buf->shm_perm.cuid = old.ds.shm_perm.cuid; |
| buf->shm_perm.cgid = old.ds.shm_perm.cgid; |
| buf->shm_perm.mode = old.ds.shm_perm.mode; |
| buf->shm_perm.__seq = old.ds.shm_perm.__seq; |
| buf->shm_atime = old.ds.shm_atime; |
| buf->shm_dtime = old.ds.shm_dtime; |
| buf->shm_ctime = old.ds.shm_ctime; |
| buf->shm_segsz = old.ds.shm_segsz; |
| buf->shm_nattch = old.ds.shm_nattch; |
| buf->shm_cpid = old.ds.shm_cpid; |
| buf->shm_lpid = old.ds.shm_lpid; |
| } |
| #if __WORDSIZE != 32 |
| else if (result != -1 && cmd == IPC_INFO) |
| { |
| struct shminfo *i = (struct shminfo *)buf; |
| |
| memset(i, 0, sizeof(*i)); |
| i->shmmax = old.info.shmmax; |
| i->shmmin = old.info.shmmin; |
| i->shmmni = old.info.shmmni; |
| i->shmseg = old.info.shmseg; |
| i->shmall = old.info.shmall; |
| } |
| #endif |
| return result; |
| } |
| #endif |
| } |
| |
| versioned_symbol (libc, __new_shmctl, shmctl, GLIBC_2_2); |