打印当前日期和时间，记录微秒级时间日志的C程序

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打印当前日期和时间

C程序：

#include <time.h> #include <stdio.h> int main(void) { time_t  t; time(&t);printf("The Calendar Time now is %s\n",ctime(&t));return 0; }

编译后运行程序，输出结果：

The Calendar Time now is Fri Jun 28 10:06:18 2013Press any key to continue

附加对应的python程序：

import timeprint time.ctime()

执行，输出结果：

'Fri Jun 28 10:10:31 2013'

参考资料：

python time模块详解

http://blog.csdn.net/kiki113/article/details/4033017

记录微秒级时间日志

logtest.h

#ifndef LOGTEST_H#define LOGTEST_H#include <stdio.h>#include <time.h>#include <sys/time.h>extern int Debugmode;extern int Logmode;extern int Testmode;// log fileextern const char *Filepath;// time parametersextern time_t T;extern struct timeval Start, End;// write log with timestampint writelog(char* str);// performance testint tick();int tock();#endif

logtest.c

#include "logtest.h"int Debugmode=0;int Logmode=0;int Testmode=0;// log fileconst char *Filepath="logfile.txt";// time parameterstime_t T;struct timeval Start, End;// write log with timestampint writelog(char* str){    FILE* logfilep;    if(Debugmode != 0){        fputs(str, stdout);         fputs("\n", stdout);    }    if(Logmode != 0){        time(&T);        if ((logfilep = fopen(Filepath,"a+"))==NULL) {            return -1;        }        fprintf(logfilep, "The calendar time now is %s\n",ctime(&T));        fprintf(logfilep, "%s\n\n", str);        fclose(logfilep);    }    return 0;}// performance testint tick(){    if(Testmode != 0){    gettimeofday(&Start, NULL);    }    return 0;}int tock(){    FILE* logfilep;    if(Testmode != 0){        gettimeofday(&End, NULL);        if ((logfilep = fopen(Filepath,"a+"))==NULL) {            return -1;        }        int dt = 1000000 * (End.tv_sec - Start.tv_sec) + (End.tv_usec - Start.tv_usec);        fprintf(logfilep, "The time difference is %d us\n\n", dt);        fclose(logfilep);    }    return 0;}

makefile:

C_COMPILER := gccRM := rm -rf EXE := ./main.PHONY: all clean# All Targetall: $(EXE)# Add inputs and outputs from these tool invocations to the build variables LIB_DIR := LIBS := OBJS := ./main.oUSER_OBJS := ./logtest.o# Tool invocations$(EXE): $(OBJS) $(USER_OBJS)@echo 'Building target: $@'@echo 'Invoking: GCC C Linker'$(C_COMPILER) -ldl $(LIB_DIR) $(LIBS) -o $@ $^@echo 'Finished building target: $@'@echo ' '# All of the sources participating in the build are defined hereINCLUDE_DIR := -I/usr/local/openssl/include# Each subdirectory must supply rules for building sources it contributes./%.o: ./%.c@echo 'Building file: $<'@echo 'Invoking: GCC C Compiler'$(C_COMPILER) -O0 -g3 -Wall $(INCLUDE_DIR) -o $@ -c $<@echo 'Finished building: $<'@echo ' 'clean:-$(RM) $(OBJS) $(USER_OBJS) $(EXE)-@echo ' '.SECONDARY:

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