1072 lines
27 KiB
C
1072 lines
27 KiB
C
/* $NetBSD: linux_misc.c,v 1.58 1999/05/17 19:26:33 thorpej Exp $ */
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/*-
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* Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
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* of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Linux compatibility module. Try to deal with various Linux system calls.
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*/
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/*
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* These functions have been moved to multiarch to allow
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* selection of which machines include them to be
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* determined by the individual files.linux_<arch> files.
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*
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* Function in multiarch:
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* linux_sys_break : linux_break.c
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* linux_sys_alarm : linux_misc_notalpha.c
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* linux_sys_getresgid : linux_misc_notalpha.c
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* linux_sys_nice : linux_misc_notalpha.c
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* linux_sys_readdir : linux_misc_notalpha.c
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* linux_sys_setresgid : linux_misc_notalpha.c
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* linux_sys_time : linux_misc_notalpha.c
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* linux_sys_utime : linux_misc_notalpha.c
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* linux_sys_waitpid : linux_misc_notalpha.c
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* linux_sys_old_mmap : linux_oldmmap.c
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* linux_sys_oldolduname : linux_oldolduname.c
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* linux_sys_oldselect : linux_oldselect.c
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* linux_sys_olduname : linux_olduname.c
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* linux_sys_pipe : linux_pipe.c
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/dirent.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/filedesc.h>
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#include <sys/ioctl.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/ptrace.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/signal.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <sys/vnode.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <sys/utsname.h>
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#include <sys/unistd.h>
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#include <sys/syscallargs.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/linux_syscallargs.h>
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#include <compat/linux/common/linux_fcntl.h>
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#include <compat/linux/common/linux_mmap.h>
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#include <compat/linux/common/linux_dirent.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_misc.h>
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#include <compat/linux/common/linux_sched.h>
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/* Local linux_misc.c functions: */
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static void bsd_to_linux_statfs __P((struct statfs *, struct linux_statfs *));
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/*
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* The information on a terminated (or stopped) process needs
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* to be converted in order for Linux binaries to get a valid signal
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* number out of it.
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*/
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void
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bsd_to_linux_wstat(st)
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int *st;
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{
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int sig;
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if (WIFSIGNALED(*st)) {
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sig = WTERMSIG(*st);
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if (sig >= 0 && sig < NSIG)
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*st= (*st& ~0177) | native_to_linux_sig[sig];
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} else if (WIFSTOPPED(*st)) {
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sig = WSTOPSIG(*st);
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if (sig >= 0 && sig < NSIG)
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*st = (*st & ~0xff00) | (native_to_linux_sig[sig] << 8);
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}
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}
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/*
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* This is very much the same as waitpid()
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*/
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int
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linux_sys_wait4(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_wait4_args /* {
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syscallarg(int) pid;
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syscallarg(int *) status;
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syscallarg(int) options;
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syscallarg(struct rusage *) rusage;
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} */ *uap = v;
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struct sys_wait4_args w4a;
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int error, *status, tstat, options, linux_options;
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caddr_t sg;
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if (SCARG(uap, status) != NULL) {
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sg = stackgap_init(p->p_emul);
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status = (int *) stackgap_alloc(&sg, sizeof *status);
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} else
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status = NULL;
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linux_options = SCARG(uap, options);
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options = 0;
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if (linux_options &
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~(LINUX_WAIT4_WNOHANG|LINUX_WAIT4_WUNTRACED|LINUX_WAIT4_WCLONE))
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return (EINVAL);
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if (linux_options & LINUX_WAIT4_WNOHANG)
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options |= WNOHANG;
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if (linux_options & LINUX_WAIT4_WUNTRACED)
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options |= WUNTRACED;
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if (linux_options & LINUX_WAIT4_WCLONE)
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options |= WALTSIG;
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SCARG(&w4a, pid) = SCARG(uap, pid);
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SCARG(&w4a, status) = status;
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SCARG(&w4a, options) = options;
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SCARG(&w4a, rusage) = SCARG(uap, rusage);
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if ((error = sys_wait4(p, &w4a, retval)))
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return error;
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sigdelset(&p->p_siglist, SIGCHLD);
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if (status != NULL) {
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if ((error = copyin(status, &tstat, sizeof tstat)))
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return error;
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bsd_to_linux_wstat(&tstat);
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return copyout(&tstat, SCARG(uap, status), sizeof tstat);
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}
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return 0;
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}
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/*
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* Linux brk(2). The check if the new address is >= the old one is
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* done in the kernel in Linux. NetBSD does it in the library.
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*/
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int
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linux_sys_brk(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_brk_args /* {
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syscallarg(char *) nsize;
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} */ *uap = v;
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char *nbrk = SCARG(uap, nsize);
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struct sys_obreak_args oba;
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struct vmspace *vm = p->p_vmspace;
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caddr_t oldbrk;
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oldbrk = vm->vm_daddr + ctob(vm->vm_dsize);
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/*
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* XXX inconsistent.. Linux always returns at least the old
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* brk value, but it will be page-aligned if this fails,
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* and possibly not page aligned if it succeeds (the user
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* supplied pointer is returned).
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*/
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SCARG(&oba, nsize) = nbrk;
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if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(p, &oba, retval) == 0)
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retval[0] = (register_t)nbrk;
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else
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retval[0] = (register_t)oldbrk;
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return 0;
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}
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/*
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* Convert BSD statfs structure to Linux statfs structure.
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* The Linux structure has less fields, and it also wants
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* the length of a name in a dir entry in a field, which
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* we fake (probably the wrong way).
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*/
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static void
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bsd_to_linux_statfs(bsp, lsp)
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struct statfs *bsp;
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struct linux_statfs *lsp;
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{
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lsp->l_ftype = bsp->f_type;
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lsp->l_fbsize = bsp->f_bsize;
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lsp->l_fblocks = bsp->f_blocks;
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lsp->l_fbfree = bsp->f_bfree;
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lsp->l_fbavail = bsp->f_bavail;
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lsp->l_ffiles = bsp->f_files;
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lsp->l_fffree = bsp->f_ffree;
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lsp->l_ffsid.val[0] = bsp->f_fsid.val[0];
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lsp->l_ffsid.val[1] = bsp->f_fsid.val[1];
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lsp->l_fnamelen = MAXNAMLEN; /* XXX */
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}
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/*
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* Implement the fs stat functions. Straightforward.
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*/
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int
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linux_sys_statfs(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_statfs_args /* {
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syscallarg(const char *) path;
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syscallarg(struct linux_statfs *) sp;
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} */ *uap = v;
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struct statfs btmp, *bsp;
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struct linux_statfs ltmp;
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struct sys_statfs_args bsa;
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caddr_t sg;
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int error;
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sg = stackgap_init(p->p_emul);
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bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs));
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LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
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SCARG(&bsa, path) = SCARG(uap, path);
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SCARG(&bsa, buf) = bsp;
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if ((error = sys_statfs(p, &bsa, retval)))
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return error;
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if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp)))
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return error;
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bsd_to_linux_statfs(&btmp, <mp);
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return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp);
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}
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int
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linux_sys_fstatfs(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_fstatfs_args /* {
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syscallarg(int) fd;
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syscallarg(struct linux_statfs *) sp;
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} */ *uap = v;
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struct statfs btmp, *bsp;
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struct linux_statfs ltmp;
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struct sys_fstatfs_args bsa;
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caddr_t sg;
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int error;
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sg = stackgap_init(p->p_emul);
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bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs));
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SCARG(&bsa, fd) = SCARG(uap, fd);
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SCARG(&bsa, buf) = bsp;
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if ((error = sys_fstatfs(p, &bsa, retval)))
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return error;
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if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp)))
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return error;
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bsd_to_linux_statfs(&btmp, <mp);
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return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp);
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}
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/*
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* uname(). Just copy the info from the various strings stored in the
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* kernel, and put it in the Linux utsname structure. That structure
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* is almost the same as the NetBSD one, only it has fields 65 characters
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* long, and an extra domainname field.
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*/
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int
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linux_sys_uname(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_uname_args /* {
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syscallarg(struct linux_utsname *) up;
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} */ *uap = v;
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extern char ostype[], hostname[], osrelease[], version[], machine[],
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domainname[];
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struct linux_utsname luts;
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int len;
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char *cp;
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strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
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strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
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strncpy(luts.l_release, osrelease, sizeof(luts.l_release));
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strncpy(luts.l_version, version, sizeof(luts.l_version));
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strncpy(luts.l_machine, machine, sizeof(luts.l_machine));
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strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
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/* This part taken from the the uname() in libc */
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len = sizeof(luts.l_version);
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for (cp = luts.l_version; len--; ++cp) {
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if (*cp == '\n' || *cp == '\t') {
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if (len > 1)
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*cp = ' ';
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else
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*cp = '\0';
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}
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}
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return copyout(&luts, SCARG(uap, up), sizeof(luts));
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}
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/* Used directly on: alpha, mips, ppc, sparc, sparc64 */
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/* Used indirectly on: arm, i386, m68k */
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/*
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* New type Linux mmap call.
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* Only called directly on machines with >= 6 free regs.
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*/
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int
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linux_sys_mmap(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_mmap_args /* {
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syscallarg(unsigned long) addr;
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syscallarg(size_t) len;
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syscallarg(int) prot;
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syscallarg(int) flags;
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syscallarg(int) fd;
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syscallarg(off_t) offset;
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} */ *uap = v;
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struct sys_mmap_args cma;
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int flags;
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flags = 0;
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flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_SHARED, MAP_SHARED);
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flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_PRIVATE, MAP_PRIVATE);
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flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_FIXED, MAP_FIXED);
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flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_ANON, MAP_ANON);
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/* XXX XAX ERH: Any other flags here? There are more defined... */
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SCARG(&cma,addr) = (void *)SCARG(uap, addr);
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SCARG(&cma,len) = SCARG(uap, len);
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SCARG(&cma,prot) = SCARG(uap, prot);
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if (SCARG(&cma,prot) & VM_PROT_WRITE) /* XXX */
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SCARG(&cma,prot) |= VM_PROT_READ;
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SCARG(&cma,flags) = flags;
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SCARG(&cma,fd) = SCARG(uap, fd);
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SCARG(&cma,pad) = 0;
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SCARG(&cma,pos) = SCARG(uap, offset);
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return sys_mmap(p, &cma, retval);
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}
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int
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linux_sys_mremap(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_mremap_args /* {
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syscallarg(void *) old_address;
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syscallarg(size_t) old_size;
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syscallarg(size_t) new_size;
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syscallarg(u_long) flags;
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} */ *uap = v;
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struct sys_munmap_args mua;
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size_t old_size, new_size;
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int error;
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old_size = round_page(SCARG(uap, old_size));
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new_size = round_page(SCARG(uap, new_size));
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/*
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* Growing mapped region.
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*/
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if (new_size > old_size) {
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/*
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* XXX Implement me. What we probably want to do is
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* XXX dig out the guts of the old mapping, mmap that
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* XXX object again with the new size, then munmap
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* XXX the old mapping.
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*/
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*retval = 0;
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return (ENOMEM);
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}
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/*
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* Shrinking mapped region.
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*/
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if (new_size < old_size) {
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SCARG(&mua, addr) = (caddr_t)SCARG(uap, old_address) +
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new_size;
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SCARG(&mua, len) = old_size - new_size;
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error = sys_munmap(p, &mua, retval);
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*retval = error ? 0 : (register_t)SCARG(uap, old_address);
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return (error);
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}
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/*
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* No change.
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*/
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*retval = (register_t)SCARG(uap, old_address);
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return (0);
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}
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int
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linux_sys_msync(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_msync_args /* {
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syscallarg(caddr_t) addr;
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syscallarg(int) len;
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syscallarg(int) fl;
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} */ *uap = v;
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struct sys___msync13_args bma;
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/* flags are ignored */
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SCARG(&bma, addr) = SCARG(uap, addr);
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SCARG(&bma, len) = SCARG(uap, len);
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SCARG(&bma, flags) = SCARG(uap, fl);
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return sys___msync13(p, &bma, retval);
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}
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/*
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* This code is partly stolen from src/lib/libc/compat-43/times.c
|
|
* XXX - CLK_TCK isn't declared in /sys, just in <time.h>, done here
|
|
*/
|
|
|
|
#define CLK_TCK 100
|
|
#define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
|
|
|
|
int
|
|
linux_sys_times(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_times_args /* {
|
|
syscallarg(struct times *) tms;
|
|
} */ *uap = v;
|
|
struct timeval t;
|
|
struct linux_tms ltms;
|
|
struct rusage ru;
|
|
int error, s;
|
|
|
|
calcru(p, &ru.ru_utime, &ru.ru_stime, NULL);
|
|
ltms.ltms_utime = CONVTCK(ru.ru_utime);
|
|
ltms.ltms_stime = CONVTCK(ru.ru_stime);
|
|
|
|
ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime);
|
|
ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime);
|
|
|
|
if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms)))
|
|
return error;
|
|
|
|
s = splclock();
|
|
timersub(&time, &boottime, &t);
|
|
splx(s);
|
|
|
|
retval[0] = ((linux_clock_t)(CONVTCK(t)));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Linux 'readdir' call. This code is mostly taken from the
|
|
* SunOS getdents call (see compat/sunos/sunos_misc.c), though
|
|
* an attempt has been made to keep it a little cleaner (failing
|
|
* miserably, because of the cruft needed if count 1 is passed).
|
|
*
|
|
* The d_off field should contain the offset of the next valid entry,
|
|
* but in Linux it has the offset of the entry itself. We emulate
|
|
* that bug here.
|
|
*
|
|
* Read in BSD-style entries, convert them, and copy them out.
|
|
*
|
|
* Note that this doesn't handle union-mounted filesystems.
|
|
*/
|
|
int
|
|
linux_sys_getdents(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_getdents_args /* {
|
|
syscallarg(int) fd;
|
|
syscallarg(struct linux_dirent *) dent;
|
|
syscallarg(unsigned int) count;
|
|
} */ *uap = v;
|
|
register struct dirent *bdp;
|
|
struct vnode *vp;
|
|
caddr_t inp, buf; /* BSD-format */
|
|
int len, reclen; /* BSD-format */
|
|
caddr_t outp; /* Linux-format */
|
|
int resid, linux_reclen = 0; /* Linux-format */
|
|
struct file *fp;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
struct linux_dirent idb;
|
|
off_t off; /* true file offset */
|
|
int buflen, error, eofflag, nbytes, oldcall;
|
|
struct vattr va;
|
|
off_t *cookiebuf = NULL, *cookie;
|
|
int ncookies;
|
|
|
|
/* getvnode() will use the descriptor for us */
|
|
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
|
|
return (error);
|
|
|
|
if ((fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
goto out1;
|
|
}
|
|
|
|
vp = (struct vnode *)fp->f_data;
|
|
if (vp->v_type != VDIR) {
|
|
error = EINVAL;
|
|
goto out1;
|
|
}
|
|
|
|
if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)))
|
|
goto out1;
|
|
|
|
nbytes = SCARG(uap, count);
|
|
if (nbytes == 1) { /* emulating old, broken behaviour */
|
|
nbytes = sizeof (struct linux_dirent);
|
|
buflen = max(va.va_blocksize, nbytes);
|
|
oldcall = 1;
|
|
} else {
|
|
buflen = min(MAXBSIZE, nbytes);
|
|
if (buflen < va.va_blocksize)
|
|
buflen = va.va_blocksize;
|
|
oldcall = 0;
|
|
}
|
|
buf = malloc(buflen, M_TEMP, M_WAITOK);
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
off = fp->f_offset;
|
|
again:
|
|
aiov.iov_base = buf;
|
|
aiov.iov_len = buflen;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_rw = UIO_READ;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_procp = p;
|
|
auio.uio_resid = buflen;
|
|
auio.uio_offset = off;
|
|
/*
|
|
* First we read into the malloc'ed buffer, then
|
|
* we massage it into user space, one record at a time.
|
|
*/
|
|
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
|
|
&ncookies);
|
|
if (error)
|
|
goto out;
|
|
|
|
inp = buf;
|
|
outp = (caddr_t)SCARG(uap, dent);
|
|
resid = nbytes;
|
|
if ((len = buflen - auio.uio_resid) == 0)
|
|
goto eof;
|
|
|
|
for (cookie = cookiebuf; len > 0; len -= reclen) {
|
|
bdp = (struct dirent *)inp;
|
|
reclen = bdp->d_reclen;
|
|
if (reclen & 3)
|
|
panic("linux_readdir");
|
|
if (bdp->d_fileno == 0) {
|
|
inp += reclen; /* it is a hole; squish it out */
|
|
off = *cookie++;
|
|
continue;
|
|
}
|
|
linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen);
|
|
if (reclen > len || resid < linux_reclen) {
|
|
/* entry too big for buffer, so just stop */
|
|
outp++;
|
|
break;
|
|
}
|
|
/*
|
|
* Massage in place to make a Linux-shaped dirent (otherwise
|
|
* we have to worry about touching user memory outside of
|
|
* the copyout() call).
|
|
*/
|
|
idb.d_ino = (linux_ino_t)bdp->d_fileno;
|
|
/*
|
|
* The old readdir() call misuses the offset and reclen fields.
|
|
*/
|
|
if (oldcall) {
|
|
idb.d_off = (linux_off_t)linux_reclen;
|
|
idb.d_reclen = (u_short)bdp->d_namlen;
|
|
} else {
|
|
if (sizeof (linux_off_t) < 4 && (off >> 32) != 0) {
|
|
compat_offseterr(vp, "linux_getdents");
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
idb.d_off = (linux_off_t)off;
|
|
idb.d_reclen = (u_short)linux_reclen;
|
|
}
|
|
strcpy(idb.d_name, bdp->d_name);
|
|
if ((error = copyout((caddr_t)&idb, outp, linux_reclen)))
|
|
goto out;
|
|
/* advance past this real entry */
|
|
inp += reclen;
|
|
off = *cookie++; /* each entry points to itself */
|
|
/* advance output past Linux-shaped entry */
|
|
outp += linux_reclen;
|
|
resid -= linux_reclen;
|
|
if (oldcall)
|
|
break;
|
|
}
|
|
|
|
/* if we squished out the whole block, try again */
|
|
if (outp == (caddr_t)SCARG(uap, dent))
|
|
goto again;
|
|
fp->f_offset = off; /* update the vnode offset */
|
|
|
|
if (oldcall)
|
|
nbytes = resid + linux_reclen;
|
|
|
|
eof:
|
|
*retval = nbytes - resid;
|
|
out:
|
|
VOP_UNLOCK(vp, 0);
|
|
if (cookiebuf)
|
|
free(cookiebuf, M_TEMP);
|
|
free(buf, M_TEMP);
|
|
out1:
|
|
FILE_UNUSE(fp, p);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Even when just using registers to pass arguments to syscalls you can
|
|
* have 5 of them on the i386. So this newer version of select() does
|
|
* this.
|
|
*/
|
|
int
|
|
linux_sys_select(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_select_args /* {
|
|
syscallarg(int) nfds;
|
|
syscallarg(fd_set *) readfds;
|
|
syscallarg(fd_set *) writefds;
|
|
syscallarg(fd_set *) exceptfds;
|
|
syscallarg(struct timeval *) timeout;
|
|
} */ *uap = v;
|
|
|
|
return linux_select1(p, retval, SCARG(uap, nfds), SCARG(uap, readfds),
|
|
SCARG(uap, writefds), SCARG(uap, exceptfds), SCARG(uap, timeout));
|
|
}
|
|
|
|
/*
|
|
* Common code for the old and new versions of select(). A couple of
|
|
* things are important:
|
|
* 1) return the amount of time left in the 'timeout' parameter
|
|
* 2) select never returns ERESTART on Linux, always return EINTR
|
|
*/
|
|
int
|
|
linux_select1(p, retval, nfds, readfds, writefds, exceptfds, timeout)
|
|
struct proc *p;
|
|
register_t *retval;
|
|
int nfds;
|
|
fd_set *readfds, *writefds, *exceptfds;
|
|
struct timeval *timeout;
|
|
{
|
|
struct sys_select_args bsa;
|
|
struct timeval tv0, tv1, utv, *tvp;
|
|
caddr_t sg;
|
|
int error;
|
|
|
|
SCARG(&bsa, nd) = nfds;
|
|
SCARG(&bsa, in) = readfds;
|
|
SCARG(&bsa, ou) = writefds;
|
|
SCARG(&bsa, ex) = exceptfds;
|
|
SCARG(&bsa, tv) = timeout;
|
|
|
|
/*
|
|
* Store current time for computation of the amount of
|
|
* time left.
|
|
*/
|
|
if (timeout) {
|
|
if ((error = copyin(timeout, &utv, sizeof(utv))))
|
|
return error;
|
|
if (itimerfix(&utv)) {
|
|
/*
|
|
* The timeval was invalid. Convert it to something
|
|
* valid that will act as it does under Linux.
|
|
*/
|
|
sg = stackgap_init(p->p_emul);
|
|
tvp = stackgap_alloc(&sg, sizeof(utv));
|
|
utv.tv_sec += utv.tv_usec / 1000000;
|
|
utv.tv_usec %= 1000000;
|
|
if (utv.tv_usec < 0) {
|
|
utv.tv_sec -= 1;
|
|
utv.tv_usec += 1000000;
|
|
}
|
|
if (utv.tv_sec < 0)
|
|
timerclear(&utv);
|
|
if ((error = copyout(&utv, tvp, sizeof(utv))))
|
|
return error;
|
|
SCARG(&bsa, tv) = tvp;
|
|
}
|
|
microtime(&tv0);
|
|
}
|
|
|
|
error = sys_select(p, &bsa, retval);
|
|
if (error) {
|
|
/*
|
|
* See fs/select.c in the Linux kernel. Without this,
|
|
* Maelstrom doesn't work.
|
|
*/
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
return error;
|
|
}
|
|
|
|
if (timeout) {
|
|
if (*retval) {
|
|
/*
|
|
* Compute how much time was left of the timeout,
|
|
* by subtracting the current time and the time
|
|
* before we started the call, and subtracting
|
|
* that result from the user-supplied value.
|
|
*/
|
|
microtime(&tv1);
|
|
timersub(&tv1, &tv0, &tv1);
|
|
timersub(&utv, &tv1, &utv);
|
|
if (utv.tv_sec < 0)
|
|
timerclear(&utv);
|
|
} else
|
|
timerclear(&utv);
|
|
if ((error = copyout(&utv, timeout, sizeof(utv))))
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get the process group of a certain process. Look it up
|
|
* and return the value.
|
|
*/
|
|
int
|
|
linux_sys_getpgid(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_getpgid_args /* {
|
|
syscallarg(int) pid;
|
|
} */ *uap = v;
|
|
struct proc *targp;
|
|
|
|
if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) {
|
|
if ((targp = pfind(SCARG(uap, pid))) == 0)
|
|
return ESRCH;
|
|
}
|
|
else
|
|
targp = p;
|
|
|
|
retval[0] = targp->p_pgid;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set the 'personality' (emulation mode) for the current process. Only
|
|
* accept the Linux personality here (0). This call is needed because
|
|
* the Linux ELF crt0 issues it in an ugly kludge to make sure that
|
|
* ELF binaries run in Linux mode, not SVR4 mode.
|
|
*/
|
|
int
|
|
linux_sys_personality(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_personality_args /* {
|
|
syscallarg(int) per;
|
|
} */ *uap = v;
|
|
|
|
if (SCARG(uap, per) != 0)
|
|
return EINVAL;
|
|
retval[0] = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The calls are here because of type conversions.
|
|
*/
|
|
int
|
|
linux_sys_setreuid(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_setreuid_args /* {
|
|
syscallarg(int) ruid;
|
|
syscallarg(int) euid;
|
|
} */ *uap = v;
|
|
struct sys_setreuid_args bsa;
|
|
|
|
SCARG(&bsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ?
|
|
(uid_t)-1 : SCARG(uap, ruid);
|
|
SCARG(&bsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ?
|
|
(uid_t)-1 : SCARG(uap, euid);
|
|
|
|
return sys_setreuid(p, &bsa, retval);
|
|
}
|
|
|
|
int
|
|
linux_sys_setregid(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_setregid_args /* {
|
|
syscallarg(int) rgid;
|
|
syscallarg(int) egid;
|
|
} */ *uap = v;
|
|
struct sys_setregid_args bsa;
|
|
|
|
SCARG(&bsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ?
|
|
(uid_t)-1 : SCARG(uap, rgid);
|
|
SCARG(&bsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ?
|
|
(uid_t)-1 : SCARG(uap, egid);
|
|
|
|
return sys_setregid(p, &bsa, retval);
|
|
}
|
|
|
|
int
|
|
linux_sys___sysctl(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys___sysctl_args /* {
|
|
syscallarg(struct linux___sysctl *) lsp;
|
|
} */ *uap = v;
|
|
struct linux___sysctl ls;
|
|
struct sys___sysctl_args bsa;
|
|
int error;
|
|
|
|
if ((error = copyin(SCARG(uap, lsp), &ls, sizeof ls)))
|
|
return error;
|
|
SCARG(&bsa, name) = ls.name;
|
|
SCARG(&bsa, namelen) = ls.namelen;
|
|
SCARG(&bsa, old) = ls.old;
|
|
SCARG(&bsa, oldlenp) = ls.oldlenp;
|
|
SCARG(&bsa, new) = ls.new;
|
|
SCARG(&bsa, newlen) = ls.newlen;
|
|
|
|
return sys___sysctl(p, &bsa, retval);
|
|
}
|
|
|
|
int
|
|
linux_sys_clone(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_clone_args /* {
|
|
syscallarg(int) flags;
|
|
syscallarg(void *) stack;
|
|
} */ *uap = v;
|
|
int flags, sig;
|
|
|
|
/*
|
|
* We don't support the Linux CLONE_PID or CLONE_PTRACE flags.
|
|
*/
|
|
if (SCARG(uap, flags) & (LINUX_CLONE_PID|LINUX_CLONE_PTRACE))
|
|
return (EINVAL);
|
|
|
|
flags = 0;
|
|
|
|
if (SCARG(uap, flags) & LINUX_CLONE_VM)
|
|
flags |= FORK_SHAREVM;
|
|
if (SCARG(uap, flags) & LINUX_CLONE_FS)
|
|
flags |= FORK_SHARECWD;
|
|
if (SCARG(uap, flags) & LINUX_CLONE_FILES)
|
|
flags |= FORK_SHAREFILES;
|
|
if (SCARG(uap, flags) & LINUX_CLONE_SIGHAND)
|
|
flags |= FORK_SHARESIGS;
|
|
if (SCARG(uap, flags) & LINUX_CLONE_VFORK)
|
|
flags |= FORK_PPWAIT;
|
|
|
|
sig = SCARG(uap, flags) & LINUX_CLONE_CSIGNAL;
|
|
if (sig < 0 || sig >= LINUX_NSIG)
|
|
return (EINVAL);
|
|
sig = linux_to_native_sig[sig];
|
|
|
|
/* XXX Is this the right thing? */
|
|
if (sig == 0)
|
|
sig = SIGCHLD;
|
|
|
|
/*
|
|
* Note that Linux does not provide a portable way of specifying
|
|
* the stack area; the caller must know if the stack grows up
|
|
* or down. So, we pass a stack size of 0, so that the code
|
|
* that makes this adjustment is a noop.
|
|
*/
|
|
return (fork1(p, flags, sig, SCARG(uap, stack), 0, retval, NULL));
|
|
}
|
|
|
|
int
|
|
linux_sys_setresuid(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_setresuid_args /* {
|
|
syscallarg(uid_t) ruid;
|
|
syscallarg(uid_t) euid;
|
|
syscallarg(uid_t) suid;
|
|
} */ *uap = v;
|
|
struct pcred *pc = p->p_cred;
|
|
uid_t ruid, euid, suid;
|
|
int error;
|
|
|
|
ruid = SCARG(uap, ruid);
|
|
euid = SCARG(uap, euid);
|
|
suid = SCARG(uap, suid);
|
|
|
|
/*
|
|
* Note: These checks are a little different than the NetBSD
|
|
* setreuid(2) call performs. This precisely follows the
|
|
* behavior of the Linux kernel.
|
|
*/
|
|
if (ruid != (uid_t)-1 &&
|
|
ruid != pc->p_ruid &&
|
|
ruid != pc->pc_ucred->cr_uid &&
|
|
ruid != pc->p_svuid &&
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
|
|
if (euid != (uid_t)-1 &&
|
|
euid != pc->p_ruid &&
|
|
euid != pc->pc_ucred->cr_uid &&
|
|
euid != pc->p_svuid &&
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
|
|
if (suid != (uid_t)-1 &&
|
|
suid != pc->p_ruid &&
|
|
suid != pc->pc_ucred->cr_uid &&
|
|
suid != pc->p_svuid &&
|
|
(error = suser(pc->pc_ucred, &p->p_acflag)))
|
|
return (error);
|
|
|
|
/*
|
|
* Now assign the new real, effective, and saved UIDs.
|
|
* Note that Linux, unlike NetBSD in setreuid(2), does not
|
|
* set the saved UID in this call unless the user specifies
|
|
* it.
|
|
*/
|
|
if (ruid != (uid_t)-1) {
|
|
(void)chgproccnt(pc->p_ruid, -1);
|
|
(void)chgproccnt(ruid, 1);
|
|
pc->p_ruid = ruid;
|
|
}
|
|
|
|
if (euid != (uid_t)-1) {
|
|
pc->pc_ucred = crcopy(pc->pc_ucred);
|
|
pc->pc_ucred->cr_uid = euid;
|
|
}
|
|
|
|
if (suid != (uid_t)-1)
|
|
pc->p_svuid = suid;
|
|
|
|
if (ruid != (uid_t)-1 && euid != (uid_t)-1 && suid != (uid_t)-1)
|
|
p->p_flag |= P_SUGID;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
linux_sys_getresuid(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct linux_sys_getresuid_args /* {
|
|
syscallarg(uid_t *) ruid;
|
|
syscallarg(uid_t *) euid;
|
|
syscallarg(uid_t *) suid;
|
|
} */ *uap = v;
|
|
struct pcred *pc = p->p_cred;
|
|
int error;
|
|
|
|
/*
|
|
* Linux copies these values out to userspace like so:
|
|
*
|
|
* 1. Copy out ruid.
|
|
* 2. If that succeeds, copy out euid.
|
|
* 3. If both of those succeed, copy out suid.
|
|
*/
|
|
if ((error = copyout(&pc->p_ruid, SCARG(uap, ruid),
|
|
sizeof(uid_t))) != 0)
|
|
return (error);
|
|
|
|
if ((error = copyout(&pc->pc_ucred->cr_uid, SCARG(uap, euid),
|
|
sizeof(uid_t))) != 0)
|
|
return (error);
|
|
|
|
return (copyout(&pc->p_svuid, SCARG(uap, suid), sizeof(uid_t)));
|
|
}
|