| /* Copyright (C) 1995,1997,1998,2000,2004,2006 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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 <bp-checks.h> |
| |
| #include <kernel-features.h> |
| #include <shlib-compat.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 *__unbounded __shm_pages; /* array of ptrs to frames -> SHMMAX */ |
| struct vm_area_struct *__unbounded __attaches; /* descriptors for attaches */ |
| }; |
| |
| struct __old_shminfo |
| { |
| int shmmax; |
| int shmmin; |
| int shmmni; |
| int shmseg; |
| int shmall; |
| }; |
| |
| #ifdef __NR_getuid32 |
| # if __ASSUME_32BITUIDS == 0 |
| /* This variable is shared with all files that need to check for 32bit |
| uids. */ |
| extern int __libc_missing_32bit_uids; |
| # endif |
| #endif |
| |
| /* 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, CHECK_1 (buf)); |
| } |
| compat_symbol (libc, __old_shmctl, shmctl, GLIBC_2_0); |
| #endif |
| |
| int |
| __new_shmctl (int shmid, int cmd, struct shmid_ds *buf) |
| { |
| #if __ASSUME_32BITUIDS > 0 |
| return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, |
| shmid, cmd | __IPC_64, 0, CHECK_1 (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, CHECK_1 (buf)); |
| } |
| |
| { |
| struct __old_shmid_ds old; |
| int result; |
| |
| # ifdef __NR_getuid32 |
| if (__libc_missing_32bit_uids <= 0) |
| { |
| if (__libc_missing_32bit_uids < 0) |
| { |
| int save_errno = errno; |
| |
| /* Test presence of new IPC by testing for getuid32 syscall. */ |
| result = INLINE_SYSCALL (getuid32, 0); |
| if (result == -1 && errno == ENOSYS) |
| __libc_missing_32bit_uids = 1; |
| else |
| __libc_missing_32bit_uids = 0; |
| __set_errno(save_errno); |
| } |
| if (__libc_missing_32bit_uids <= 0) |
| return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, |
| shmid, cmd | __IPC_64, 0, CHECK_1 (buf)); |
| } |
| # endif |
| |
| if (cmd == IPC_SET) |
| { |
| old.shm_perm.uid = buf->shm_perm.uid; |
| old.shm_perm.gid = buf->shm_perm.gid; |
| old.shm_perm.mode = buf->shm_perm.mode; |
| if (old.shm_perm.uid != buf->shm_perm.uid || |
| old.shm_perm.gid != buf->shm_perm.gid) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| } |
| result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, |
| shmid, cmd, 0, __ptrvalue (&old)); |
| if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT)) |
| { |
| memset(buf, 0, sizeof(*buf)); |
| buf->shm_perm.__key = old.shm_perm.__key; |
| buf->shm_perm.uid = old.shm_perm.uid; |
| buf->shm_perm.gid = old.shm_perm.gid; |
| buf->shm_perm.cuid = old.shm_perm.cuid; |
| buf->shm_perm.cgid = old.shm_perm.cgid; |
| buf->shm_perm.mode = old.shm_perm.mode; |
| buf->shm_perm.__seq = old.shm_perm.__seq; |
| buf->shm_atime = old.shm_atime; |
| buf->shm_dtime = old.shm_dtime; |
| buf->shm_ctime = old.shm_ctime; |
| buf->shm_segsz = old.shm_segsz; |
| buf->shm_nattch = old.shm_nattch; |
| buf->shm_cpid = old.shm_cpid; |
| buf->shm_lpid = old.shm_lpid; |
| } |
| # if __WORDSIZE != 32 |
| else if (result != -1 && cmd == IPC_INFO) |
| { |
| struct __old_shminfo *oldi = (struct __old_shminfo *)&old; |
| struct shminfo *i = (struct shminfo *)buf; |
| |
| memset(i, 0, sizeof(*i)); |
| i->shmmax = oldi->shmmax; |
| i->shmmin = oldi->shmmin; |
| i->shmmni = oldi->shmmni; |
| i->shmseg = oldi->shmseg; |
| i->shmall = oldi->shmall; |
| } |
| # endif |
| return result; |
| } |
| #endif |
| } |
| |
| versioned_symbol (libc, __new_shmctl, shmctl, GLIBC_2_2); |