Changing what time a process thinks it is with libfaketime


 
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Old 09-22-2008
Changing what time a process thinks it is with libfaketime

09-22-2008 08:00 AM
With libfaketime you can tell a process that the current time is something different from the machine's system clock. This fake time setting affects not only the functions directly related to reading the system time, but also file timestamps such as modification times. With libfaketime you can test how a program will respond when it is running in the future or in a different timezone without having to change your machine's system clock. Timezone testing can be useful for network applications where a certificate may have already expired in a given timezone but might still work in your local environment.



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TIMES(2)							System Calls Manual							  TIMES(2)

NAME
times - get process times SYNOPSIS
#include <sys/types.h> #include <sys/times.h> #include <time.h> int times(struct tms *buffer) DESCRIPTION
Times returns time-accounting information for the current process and for the terminated child processes of the current process. All times are in 1/CLOCKS_PER_SEC seconds. This is the structure returned by times: struct tms { clock_t tms_utime; /* user time for this process */ clock_t tms_stime; /* system time for this process */ clock_t tms_cutime; /* children's user time */ clock_t tms_cstime; /* children's system time */ }; The user time is the number of clock ticks used by a process on its own computations. The system time is the number of clock ticks spent inside the kernel on behalf of a process. This does not include time spent waiting for I/O to happen, only actual CPU instruction times. The children times are the sum of the children's process times and their children's times. RETURN
Times returns 0 on success, otherwise -1 with the error code stored into the global variable errno. ERRORS
The following error code may be set in errno: [EFAULT] The address specified by the buffer parameter is not in a valid part of the process address space. SEE ALSO
time(1), wait(2), time(2). 4th Berkeley Distribution May 9, 1985 TIMES(2)