mirror of
https://sourceware.org/git/glibc.git
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be9b0b9a01
It avoids regressions on possible future commands that might require additional libc support. The downside is new commands added by newer kernels will need further glibc support. Checked on x86_64-linux-gnu and i686-linux-gnu (Linux v4.15 and v5.4).
281 lines
8.0 KiB
C
281 lines
8.0 KiB
C
/* Copyright (C) 1995-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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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/msg.h>
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#include <ipc_priv.h>
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#include <sysdep.h>
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#include <shlib-compat.h>
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#include <errno.h>
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#include <linux/posix_types.h> /* For __kernel_mode_t. */
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/* POSIX states ipc_perm mode should have type of mode_t. */
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_Static_assert (sizeof ((struct msqid_ds){0}.msg_perm.mode)
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== sizeof (mode_t),
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"sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
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#if __IPC_TIME64 == 0
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typedef struct msqid_ds msgctl_arg_t;
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#else
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# include <struct_kernel_msqid64_ds.h>
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static void
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msqid64_to_kmsqid64 (const struct __msqid64_ds *msqid64,
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struct kernel_msqid64_ds *kmsqid)
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{
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kmsqid->msg_perm = msqid64->msg_perm;
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kmsqid->msg_stime = msqid64->msg_stime;
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kmsqid->msg_stime_high = msqid64->msg_stime >> 32;
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kmsqid->msg_rtime = msqid64->msg_rtime;
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kmsqid->msg_rtime_high = msqid64->msg_rtime >> 32;
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kmsqid->msg_ctime = msqid64->msg_ctime;
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kmsqid->msg_ctime_high = msqid64->msg_ctime >> 32;
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kmsqid->msg_cbytes = msqid64->msg_cbytes;
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kmsqid->msg_qnum = msqid64->msg_qnum;
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kmsqid->msg_qbytes = msqid64->msg_qbytes;
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kmsqid->msg_lspid = msqid64->msg_lspid;
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kmsqid->msg_lrpid = msqid64->msg_lrpid;
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}
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static void
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kmsqid64_to_msqid64 (const struct kernel_msqid64_ds *kmsqid,
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struct __msqid64_ds *msqid64)
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{
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msqid64->msg_perm = kmsqid->msg_perm;
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msqid64->msg_stime = kmsqid->msg_stime
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| ((__time64_t) kmsqid->msg_stime_high << 32);
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msqid64->msg_rtime = kmsqid->msg_rtime
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| ((__time64_t) kmsqid->msg_rtime_high << 32);
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msqid64->msg_ctime = kmsqid->msg_ctime
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| ((__time64_t) kmsqid->msg_ctime_high << 32);
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msqid64->msg_cbytes = kmsqid->msg_cbytes;
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msqid64->msg_qnum = kmsqid->msg_qnum;
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msqid64->msg_qbytes = kmsqid->msg_qbytes;
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msqid64->msg_lspid = kmsqid->msg_lspid;
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msqid64->msg_lrpid = kmsqid->msg_lrpid;
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}
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typedef struct kernel_msqid64_ds msgctl_arg_t;
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#endif
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static int
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msgctl_syscall (int msqid, int cmd, msgctl_arg_t *buf)
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{
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#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
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return INLINE_SYSCALL_CALL (msgctl, msqid, cmd | __IPC_64, buf);
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#else
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return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd | __IPC_64, 0,
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buf);
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#endif
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}
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int
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__msgctl64 (int msqid, int cmd, struct __msqid64_ds *buf)
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{
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#if __IPC_TIME64
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struct kernel_msqid64_ds ksemid, *arg = NULL;
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#else
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msgctl_arg_t *arg;
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#endif
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switch (cmd)
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{
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case IPC_RMID:
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arg = NULL;
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break;
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case IPC_SET:
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case IPC_STAT:
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case MSG_STAT:
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case MSG_STAT_ANY:
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#if __IPC_TIME64
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if (buf != NULL)
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{
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msqid64_to_kmsqid64 (buf, &ksemid);
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arg = &ksemid;
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}
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# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
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if (cmd == IPC_SET)
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arg->msg_perm.mode *= 0x10000U;
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# endif
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#else
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arg = buf;
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#endif
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break;
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case IPC_INFO:
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case MSG_INFO:
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/* This is a Linux extension where kernel returns a 'struct msginfo'
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instead. */
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arg = (__typeof__ (arg)) buf;
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break;
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default:
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__set_errno (EINVAL);
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return -1;
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}
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int ret = msgctl_syscall (msqid, cmd, arg);
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if (ret < 0)
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return ret;
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switch (cmd)
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{
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case IPC_STAT:
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case MSG_STAT:
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case MSG_STAT_ANY:
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#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
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arg->msg_perm.mode >>= 16;
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#else
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/* Old Linux kernel versions might not clear the mode padding. */
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if (sizeof ((struct msqid_ds){0}.msg_perm.mode)
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!= sizeof (__kernel_mode_t))
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arg->msg_perm.mode &= 0xFFFF;
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#endif
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#if __IPC_TIME64
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kmsqid64_to_msqid64 (arg, buf);
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#endif
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}
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return ret;
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}
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#if __TIMESIZE != 64
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libc_hidden_def (__msgctl64)
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static void
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msqid_to_msqid64 (struct __msqid64_ds *mq64, const struct msqid_ds *mq)
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{
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mq64->msg_perm = mq->msg_perm;
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mq64->msg_stime = mq->msg_stime
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| ((__time64_t) mq->__msg_stime_high << 32);
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mq64->msg_rtime = mq->msg_rtime
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| ((__time64_t) mq->__msg_rtime_high << 32);
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mq64->msg_ctime = mq->msg_ctime
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| ((__time64_t) mq->__msg_ctime_high << 32);
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mq64->msg_cbytes = mq->msg_cbytes;
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mq64->msg_qnum = mq->msg_qnum;
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mq64->msg_qbytes = mq->msg_qbytes;
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mq64->msg_lspid = mq->msg_lspid;
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mq64->msg_lrpid = mq->msg_lrpid;
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}
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static void
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msqid64_to_msqid (struct msqid_ds *mq, const struct __msqid64_ds *mq64)
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{
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mq->msg_perm = mq64->msg_perm;
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mq->msg_stime = mq64->msg_stime;
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mq->__msg_stime_high = 0;
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mq->msg_rtime = mq64->msg_rtime;
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mq->__msg_rtime_high = 0;
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mq->msg_ctime = mq64->msg_ctime;
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mq->__msg_ctime_high = 0;
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mq->msg_cbytes = mq64->msg_cbytes;
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mq->msg_qnum = mq64->msg_qnum;
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mq->msg_qbytes = mq64->msg_qbytes;
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mq->msg_lspid = mq64->msg_lspid;
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mq->msg_lrpid = mq64->msg_lrpid;
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}
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int
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__msgctl (int msqid, int cmd, struct msqid_ds *buf)
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{
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struct __msqid64_ds msqid64, *buf64 = NULL;
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if (buf != NULL)
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{
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/* This is a Linux extension where kernel returns a 'struct msginfo'
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instead. */
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if (cmd == IPC_INFO || cmd == MSG_INFO)
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buf64 = (struct __msqid64_ds *) buf;
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else
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{
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msqid_to_msqid64 (&msqid64, buf);
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buf64 = &msqid64;
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}
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}
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int ret = __msgctl64 (msqid, cmd, buf64);
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if (ret < 0)
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return ret;
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switch (cmd)
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{
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case IPC_STAT:
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case MSG_STAT:
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case MSG_STAT_ANY:
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msqid64_to_msqid (buf, buf64);
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}
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return ret;
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}
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#endif
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#ifndef DEFAULT_VERSION
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# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
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# define DEFAULT_VERSION GLIBC_2_2
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# else
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# define DEFAULT_VERSION GLIBC_2_31
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# endif
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#endif
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versioned_symbol (libc, __msgctl, msgctl, DEFAULT_VERSION);
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#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
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&& SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
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int
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attribute_compat_text_section
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__msgctl_mode16 (int msqid, int cmd, struct msqid_ds *buf)
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{
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return msgctl_syscall (msqid, cmd, (msgctl_arg_t *) buf);
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}
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compat_symbol (libc, __msgctl_mode16, msgctl, GLIBC_2_2);
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#endif
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
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struct __old_msqid_ds
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{
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struct __old_ipc_perm msg_perm; /* structure describing operation permission */
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struct msg *__msg_first; /* pointer to first message on queue */
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struct msg *__msg_last; /* pointer to last message on queue */
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__time_t msg_stime; /* time of last msgsnd command */
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__time_t msg_rtime; /* time of last msgrcv command */
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__time_t msg_ctime; /* time of last change */
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struct wait_queue *__wwait; /* ??? */
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struct wait_queue *__rwait; /* ??? */
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unsigned short int __msg_cbytes; /* current number of bytes on queue */
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unsigned short int msg_qnum; /* number of messages currently on queue */
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unsigned short int msg_qbytes; /* max number of bytes allowed on queue */
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__ipc_pid_t msg_lspid; /* pid of last msgsnd() */
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__ipc_pid_t msg_lrpid; /* pid of last msgrcv() */
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};
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int
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attribute_compat_text_section
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__old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
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{
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#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
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&& !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
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/* For architecture that have wire-up msgctl but also have __IPC_64 to a
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value different than default (0x0) it means the compat symbol used the
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__NR_ipc syscall. */
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return INLINE_SYSCALL_CALL (msgctl, msqid, cmd, buf);
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#else
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return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd, 0, buf);
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#endif
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}
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compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
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#endif
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