8fe8417ffb
In embedded development environments, due to the lack of address isolation between processes, fd may be passed between processes and lead to misuse, We have designed an fd cross-process automatic detection tool, fdcheck_protect returns the fd containing the pid information, indicating that the ownership of the current fd belongs to the pid and is not allowed to be used by other processes. fdcheck_restore will obtain the true fd and check if the ownership of the fd is legal For ease of understanding, let's give an example where the following information is represented in 32-bit binary format fd 00000000 00000000 00000000 10001010 pid 00000000 00000000 00000011 01010101 ret 00000000 00000011 01010101 10001010 Signed-off-by: hujun5 <hujun5@xiaomi.com>
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/****************************************************************************
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* include/sys/select.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_SYS_SELECT_H
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#define __INCLUDE_SYS_SELECT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <limits.h>
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#include <stdint.h>
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#include <signal.h>
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#include <sys/time.h>
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#ifdef CONFIG_FDCHECK
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# include <nuttx/fdcheck.h>
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#endif
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Get the total number of descriptors that we will have to support */
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#define FD_SETSIZE OPEN_MAX
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/* We will use a 32-bit bitsets to represent the set of descriptors. How
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* many uint32_t's do we need to span all descriptors?
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*/
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#if FD_SETSIZE <= 32
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# define __SELECT_NUINT32 1
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#elif FD_SETSIZE <= 64
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# define __SELECT_NUINT32 2
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#elif FD_SETSIZE <= 96
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# define __SELECT_NUINT32 3
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#elif FD_SETSIZE <= 128
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# define __SELECT_NUINT32 4
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#elif FD_SETSIZE <= 160
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# define __SELECT_NUINT32 5
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#elif FD_SETSIZE <= 192
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# define __SELECT_NUINT32 6
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#elif FD_SETSIZE <= 224
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# define __SELECT_NUINT32 7
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#elif FD_SETSIZE <= 256
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# define __SELECT_NUINT32 8
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#else
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# warning "Larger fd_set needed"
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#endif
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/* These macros map a file descriptor to an index and bit number */
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#define _FD_NDX(fd) ((fd) >> 5)
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#define _FD_BIT(fd) ((fd) & 0x1f)
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/* Standard helper macros */
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#ifdef CONFIG_FDCHECK
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# define FD_CLR(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fdcheck_restore(fd))] &= ~(UINT32_C(1)<< _FD_BIT(fdcheck_restore(fd))))
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# define FD_SET(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fdcheck_restore(fd))] |= (UINT32_C(1) << _FD_BIT(fdcheck_restore(fd))))
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# define FD_ISSET(fd,set) \
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(((((fd_set*)(set))->arr)[_FD_NDX(fdcheck_restore(fd))] & (UINT32_C(1) << _FD_BIT(fdcheck_restore(fd)))) != 0)
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#else
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# define FD_CLR(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(UINT32_C(1)<< _FD_BIT(fd)))
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# define FD_SET(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (UINT32_C(1) << _FD_BIT(fd)))
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# define FD_ISSET(fd,set) \
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(((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (UINT32_C(1) << _FD_BIT(fd))) != 0)
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#endif
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#define FD_ZERO(set) \
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memset((set), 0, sizeof(fd_set))
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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struct fd_set_s
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{
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uint32_t arr[__SELECT_NUINT32];
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};
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typedef struct fd_set_s fd_set;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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struct timeval;
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int select(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
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FAR fd_set *exceptfds, FAR struct timeval *timeout);
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int pselect(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
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FAR fd_set *exceptfds, FAR const struct timespec *timeout,
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FAR const sigset_t *sigmask);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_SYS_SELECT_H */
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