diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/shmctl.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/shmctl.c | 100 |
1 files changed, 95 insertions, 5 deletions
diff --git a/sysdeps/unix/sysv/linux/shmctl.c b/sysdeps/unix/sysv/linux/shmctl.c index 890e700a30..d9722ccc84 100644 --- a/sysdeps/unix/sysv/linux/shmctl.c +++ b/sysdeps/unix/sysv/linux/shmctl.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc. +/* 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. @@ -17,19 +17,109 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#define __LIBC_IPC_INTERNAL #include <errno.h> #include <sys/shm.h> #include <sysdep.h> +#include <string.h> #include <sys/syscall.h> +#include <bits/wordsize.h> + +#include "kernel-features.h" /* 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 -shmctl (shmid, cmd, buf) - int shmid; - int cmd; - struct shmid_ds *buf; +__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 = errno, result; + struct __old_shmid_ds 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.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 |