C-language acquisition of microsecond time in Linux

Get microsecond time in Linux with C language

1. Data structure

int gettimeofday (structstruct timezone *tz);

The parameter TV is the structure that holds the result of the acquisition time, and the parameter tz is used to save the time zone result:

struct timezone{int tz_minuteswest; /* Time difference between GMT and West */ int tz_dsttime; /* How to fix DST time */ }

The timezone parameter is passed in NULL if it is not used.

The structure timeval is defined as:

struct timeval{longint/  s number of longint/  μs }

2. code example Temp.cpp

#include <stdio.h>//For printf ()#include <sys/time.h>//For Gettimeofday ()#include <unistd.h>//For sleep ()intMain () {structtimeval start, end; Gettimeofday (&start, NULL); printf ("Start:%d.%d\n", Start.tv_sec, start.tv_usec); Sleep (1); Gettimeofday (&end, NULL); printf ("End:%d.%d\n", End.tv_sec, end.tv_usec); return 0;}

3. Compiling

g++-O temp temp.cpp

4. Operation and Results

$./1418118324.633128end   1418118325.634616

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C-language acquisition of microsecond time in Linux