diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/shmctl.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/shmctl.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/shmctl.c b/sysdeps/unix/sysv/linux/i386/shmctl.c new file mode 100644 index 0000000000..2fffc16f1f --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/shmctl.c @@ -0,0 +1,173 @@ +/* Copyright (C) 1995, 1997, 1998, 2000 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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 "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; +}; + +#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. */ +int __old_shmctl (int, int, struct __old_shmid_ds *); +int __new_shmctl (int, int, struct shmid_ds *); + +int +__old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf) +{ + return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf); +} + +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, 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 = result; + struct __old_shmid_ds old; + +#ifdef __NR_getuid32 + if (__libc_missing_32bit_uids <= 0) + { + if (__libc_missing_32bit_uids < 0) + { + 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) + { + result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0, buf); + return result; + } + } +#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, &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 +} + +#if defined PIC && DO_VERSIONING +default_symbol_version (__new_shmctl, shmctl, GLIBC_2.2); +symbol_version (__old_shmctl, shmctl, GLIBC_2.0); +#else +weak_alias (__new_shmctl, shmctl); +#endif |