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Section 2.9.1 of the System Interfaces volume of POSIX.1-2008 has a much longer list of functions that are not required to be thread - safe.
Non-Compliant Code Example
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The compliant solution uses strerror_r(), which has the same functionality as strerror() but guarantees thread - safety.
| Code Block | ||
|---|---|---|
| ||
FILE* fd = fopen( filename, "r");
if (fd == NULL) {
char errmsg[BUFSIZ];
if (strerror_r( errno, errmsg, BUFSIZ) != 0) {
/* handle error */
}
printf("Could not open file because of %s\n", errmsg);
}
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