IO.BRAW : File Open for Both Read and Write

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CodeSonar^® 9.2p0

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C and C++

IO.BRAW : File Open for Both Read and Write

Summary

One of the following.

A file is opened for read access on one stream, but is already open for write access on another stream.
A file is opened for write access on one stream, but is already open for read access on another stream.

Properties

Class Name

File Open for Both Read and Write

Significance

reliability

Mnemonic

IO.BRAW

Categories

MisraC2025	MisraC2025:22.3	The same file shall not be open for read and write access at the same time on different streams
MisraC2023	MisraC2023:22.3	The same file shall not be open for read and write access at the same time on different streams
Misra2012	Misra2012:22.3	The same file shall not be open for read and write access at the same time on different streams
MisraC++2023	MisraC++2023:0.3.2	A function call shall not violate the function's preconditions
CERT-C	CERT-C:FIO24-C	Do not open a file that is already open

Availability

Available for C and C++.

Enabling

Checks for this warning class are enabled by default. To disable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += discard class="File Open for Both Read and Write"

Example

#include <stdio.h>

void io_braw( void ){
    FILE * fw = fopen( "tmp", "r+" );                          /* "r+" opens for read/write */
    FILE * fr = fopen( "tmp", "r" );  /* 'File Open for Both Read and Write' warning issued here
                                       * ('File System Race Condition' warning also issued)
                                       */
    /* do something with fw and fr ... */
    if( fw ) { fclose( fw ); }
    if( fr ) { fclose( fr ); }
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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