0f85ff377b
CloudABI purely operates on file descriptor rights (CAP_*). File descriptor access modes (O_ACCMODE) are emulated on top of rights. Instead of accepting the traditional flags argument, file_open() copies in an fdstat_t object that contains the initial rights the descriptor should have, but also file descriptor flags that should persist after opening (APPEND, NONBLOCK, *SYNC). Only flags that don't persist (EXCL, TRUNC, CREAT, DIRECTORY) are passed in as an argument. file_open() first converts the rights, the persistent flags and the non-persistent flags to fflags. It then calls into vn_open(). If successful, it installs the file descriptor with the requested rights, trimming off rights that don't apply to the type of the file that has been opened. Unlike kern_openat(), this function does not support /dev/fd/*. I can't think of a reason why we need to support this for CloudABI. Obtained from: https://github.com/NuxiNL/freebsd Differential Revision: https://reviews.freebsd.org/D3235
80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
/*-
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* Copyright (c) 2015 Nuxi, https://nuxi.nl/
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CLOUDABI_UTIL_H_
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#define _CLOUDABI_UTIL_H_
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#include <sys/socket.h>
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#include <compat/cloudabi/cloudabi_syscalldefs.h>
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struct file;
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struct thread;
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struct timespec;
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/* Fetches the time value of a clock. */
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int cloudabi_clock_time_get(struct thread *, cloudabi_clockid_t,
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cloudabi_timestamp_t *);
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/* Converts a FreeBSD errno to a CloudABI errno. */
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cloudabi_errno_t cloudabi_convert_errno(int);
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/* Converts FreeBSD's struct sockaddr to CloudABI's cloudabi_sockaddr_t. */
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void cloudabi_convert_sockaddr(const struct sockaddr *, socklen_t,
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cloudabi_sockaddr_t *);
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/* Converts a file descriptor to a CloudABI file descriptor type. */
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cloudabi_filetype_t cloudabi_convert_filetype(const struct file *);
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/* Converts CloudABI rights to a set of Capsicum capabilities. */
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int cloudabi_convert_rights(cloudabi_rights_t, cap_rights_t *);
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/* Removes rights that conflict with the file descriptor type. */
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void cloudabi_remove_conflicting_rights(cloudabi_filetype_t,
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cloudabi_rights_t *, cloudabi_rights_t *);
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/* Converts a struct timespec to a CloudABI timestamp. */
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int cloudabi_convert_timespec(const struct timespec *, cloudabi_timestamp_t *);
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/*
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* Blocking futex functions.
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*
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* These functions are called by CloudABI's polling system calls to
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* sleep on a lock or condition variable.
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*/
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int cloudabi_futex_condvar_wait(struct thread *, cloudabi_condvar_t *,
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cloudabi_mflags_t, cloudabi_lock_t *, cloudabi_mflags_t, cloudabi_clockid_t,
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cloudabi_timestamp_t, cloudabi_timestamp_t);
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int cloudabi_futex_lock_rdlock(struct thread *, cloudabi_lock_t *,
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cloudabi_mflags_t, cloudabi_clockid_t, cloudabi_timestamp_t,
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cloudabi_timestamp_t);
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int cloudabi_futex_lock_wrlock(struct thread *, cloudabi_lock_t *,
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cloudabi_mflags_t, cloudabi_clockid_t, cloudabi_timestamp_t,
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cloudabi_timestamp_t);
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#endif
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