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C and C++

LANG.ERRCODE.ANZ : Non-zero Error Code Assignment

Summary

The code assigns a value other than literal zero (0) to an error code (such as errno).

Properties

Class Name Non-zero Error Code Assignment
Significance style
Mnemonic LANG.ERRCODE.ANZ
Categories
Misra2004 Misra2004:20.5 The error indicator errno shall not be used
AUTOSARC++14 AUTOSARC++14:M19-3-1 The error indicator errno shall not be used.
MisraC++2008 MisraC++2008:19-3-1 The error indicator errno shall not be used.
MisraC++2023 MisraC++2023:22.4.1 The literal value zero shall be the only value assigned to errno
JSF++ JSF++:17 The error indicator errno shall not be used.
Availability Available for C and C++.
Enabling Checks for this warning class are disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file. 
WARNING_FILTER += allow class="Non-zero Error Code Assignment"

Example 

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

enum Error {
    ok = 0,
    error = 1,
};

int my_errno = Error::ok;

void fix_my_problem( int en );

void lang_errcode_anz( void ) {
    FILE *fp;
    errno = 0;                                 // ok - resetting to literal zero
    fp = fopen("myfile.txt", "r");             // fp will set errno on failure
    if (!fp){
	errno = Error::error;  // 'Non-zero Error Code Assignment' warning issued here - nonzero
	my_errno = Error::error;                // ok - not setting errno
	fix_my_problem(errno);
        errno = Error::ok;     // 'Non-zero Error Code Assignment' warning issued here - not literal zero
    }
    else {
        fclose(fp);
    }
}

Relevant Configuration File Parameters

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

 

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