SEI CERT C Coding Standard

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Section 2.9.1 of the System Interfaces volume of POSIX.1-2008 augments of Standard for Information Technology—Portable Operating System Interface (POSIX®), Base Specifications, Issue 7 (IEEE Std 1003.1, 2013 Edition) [IEEE Std 1003.1:2013] augments the list of functions that are not required to be thread-safe [ISO/IEC/IEEE 9945:2008].

Noncompliant Code Example

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CERT C Secure Coding StandardERR30-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 failure 
CERT C++ Secure Coding StandardCON03-CPP. Avoid assuming functions are thread safe unless otherwise specified

Bibliography

[IEEE Std 1003.1:2013]Section 2.9.1, "Thread Safety"
[ISO/IEC 9899:2011]

Subclause 7.24.6.2, "The strerror Function" 

[Open Group 1997b]Section 10.12, "Thread-Safe POSIX.1 and C-Language Functions"

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