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22a46dee24
Old applications pass __IPC_64 as part of the command argument because old glibc did not check for unknown commands, and passed through the arguments directly to the kernel, without adding __IPC_64. Applications need to continue doing that for old glibc compatibility, so this commit enables this approach in current glibc. For msgctl and shmctl, if no translation is required, make direct system calls, as we did before the time64 changes. If translation is required, mask __IPC_64 from the command argument. For semctl, the union-in-vararg argument handling means that translation is needed on all architectures. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* Old SysV permission definition for Linux. Default version.
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Copyright (C) 1995-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/ipc.h> /* For __key_t */
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#include <kernel-features.h>
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#ifdef __ASSUME_SYSVIPC_DEFAULT_IPC_64
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# define __IPC_64 0x0
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#else
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# define __IPC_64 0x100
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#endif
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#ifndef __OLD_IPC_ID_TYPE
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# define __OLD_IPC_ID_TYPE unsigned short int
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#endif
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#ifndef __OLD_IPC_MODE_TYPE
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# define __OLD_IPC_MODE_TYPE unsigned short int
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#endif
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struct __old_ipc_perm
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{
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__key_t __key; /* Key. */
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__OLD_IPC_ID_TYPE uid; /* Owner's user ID. */
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__OLD_IPC_ID_TYPE gid; /* Owner's group ID. */
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__OLD_IPC_ID_TYPE cuid; /* Creator's user ID. */
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__OLD_IPC_ID_TYPE cgid; /* Creator's group ID. */
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__OLD_IPC_MODE_TYPE mode; /* Read/write permission. */
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unsigned short int __seq; /* Sequence number. */
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};
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#define SEMCTL_ARG_ADDRESS(__arg) &__arg.array
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#define MSGRCV_ARGS(__msgp, __msgtyp) \
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((long int []){ (long int) __msgp, __msgtyp })
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/* This macro is required to handle the s390 variants, which passes the
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arguments in a different order than default. */
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#define SEMTIMEDOP_IPC_ARGS(__nsops, __sops, __timeout) \
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(__nsops), 0, (__sops), (__timeout)
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/* Linux SysV ipc does not provide new syscalls for 64-bit time support on
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32-bit architectures, but rather split the timestamp into high and low;
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storing the high value in previously unused fields. */
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#if (__WORDSIZE == 32 \
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&& (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32))
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# define __IPC_TIME64 1
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#else
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# define __IPC_TIME64 0
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#endif
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#if __IPC_TIME64 || defined __ASSUME_SYSVIPC_BROKEN_MODE_T
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# define IPC_CTL_NEED_TRANSLATION 1
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#else
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# define IPC_CTL_NEED_TRANSLATION 0
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#endif
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#include <ipc_ops.h>
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