BADFUNC.TIME_H : Use of <time.h> Time/Date Function

Summary

A use of one of the functions defined in <time.h>: asctime(), asctime_r(), clock(), clock_getres(), clock_gettime(), clock_settime(), ctime(), ctime_r(), difftime(), getdate(), gmtime(), gmtime_r(), localtime(), localtime_r(), mktime(), nanosleep(), strftime(), strptime(), time(), timer_create(), timer_delete(), timer_gettime(), timer_getoverrun(), timer_settime(), tzset().

These functions are associated with unspecified, undefined, and implementation-defined behaviors.

Properties

WARNING_FILTER += allow class="Use of <time.h> Time/Date Function"

Example

#include <time.h>
        
void long_running_func(void);

clock_t instrument_my_code(void){
  clock_t t;
  t = clock();        /* 'Use of <time.h> Time/Date Function' warning issued here */
  long_running_func();
  return clock() - t; /* 'Use of <time.h> Time/Date Function' warning issued here */
}

Relevant Configuration File Parameters

This class is implemented using a BAD_FUNCTION_* rule set in the general template configuration file.

• To include an additional function or set of functions in the checks for this class, create a new set of BAD_FUNCTION_* rules in which the BAD_FUNCTION_REGEX setting matches the function or set of functions you want to check and the remaining rules match those in the other sets for this class.
• To remove a function or set of functions from the checks for this class, edit the configuration file to comment out the corresponding set of BAD_FUNCTION_* rules.

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

• BAD_FUNCTION_BASE_RANK
• BAD_FUNCTION_CATEGORIES
• BAD_FUNCTION_INFO
• BAD_FUNCTION_LINK
• BAD_FUNCTION_MESSAGE
• BAD_FUNCTION_RANK
• BAD_FUNCTION_REGEX
• BAD_FUNCTION_SIGNIFICANCE
• REPORT_SIMILAR_WARNINGS
• WARNING_FILTER