Page History

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Code Block

language	cpp

#ifndef __STDC_LIB_EXT1__
  typedef int errno_t;
#endif

Noncompliant Code Example

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This noncompliant code example nevertheless complies with ERR30-C. Set errno to zero before calling a library function known to set errno, and check errno only after the function returns a value indicating failureTake care when reading errno.

Compliant Solution (POSIX)

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This compliant solution is categorized as a POSIX solution because it returns EINVAL and EIO , which are defined by POSIX (IEEE Std 1003.1, 2013 Edition) but not by the C Standard.

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Failing to test for error conditions can lead to vulnerabilities of varying severity. Declaring functions that return an errno with a return type of errno_t will not eliminate this problem but may reduce errors caused by programmers' misunderstanding the purpose of a return value.

Recommendation	Severity	Likelihood

Remediation Cost

Detectable	Repairable	Priority	Level
DCL09-C	Low	Unlikely

Low

No

Yes

P3

P2

L3

Automated Detection

Tool

Version

Checker

Description

Axivion Bauhaus Suite

Include Page

	Axivion Bauhaus Suite_V
	Axivion Bauhaus Suite_V

CertC-DCL09

LDRA tool suite

Include Page

	LDRA_V
	LDRA_V

634 S

Partially Implemented

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

Related Guidelines

SEI CERT C++

Secure

Coding Standard	VOID DCL09-CPP. Declare functions that return errno with a return type of errno_t
ISO/IEC TR 24772:2013	Ignored Error Status and Unhandled Exceptions [OYB]

MISRA C:2012Directive 1.1 (required)