简单日志记录文件

#include <stdio.h> #include <sys/ioctl.h> #include <sys/shm.h> #include <sys/file.h> #include <wait.h> #include <stdlib.h> #include <time.h> #include <stdarg.h> #define LOG "./log" void log(char CH,const char* format,...) { time_t t; struct tm* p; int r,fd; FILE* fp; va_list ap; t = time(NULL); p = gmtime(&t); //当前时间 fp = fopen(LOG,"a"); if(fp == NULL) { fprintf(stderr,"Unable to open '%s'./n",LOG); return; } fd = fileno(fp); r = flock(fd,LOCK_EX); //给文件加锁 if(r != 0) perror("File lock error./n"); fprintf(fp,"[%i/%02i/%02i %02i:%02i:%02i]: ",1900+p->tm_year,1+p->tm_mon,p->tm_mday,p->tm_hour,p->tm_min,p->tm_sec); //记录时间 switch(CH) { case 'A': fprintf(fp,"very good: "); break; case 'B': fprintf(fp,"good: "); break; case 'C': fprintf(fp,"same: "); break; case 'D': fprintf(fp,"error: "); default: break; } va_start(ap,format); //获取参数量 vfprintf(fp,format,ap); //打印到文件 va_end(ap); fprintf(fp,"/n"); r = flock(fd,LOCK_UN); //解锁 if(r != 0) perror("Ulock error./n"); fclose(fp); } int main() { char *A1="70-90"; char *A2="90-100"; log('A',"%s,%s",A1,A2); log('B',"60-70"); log('C',"40-60"); log('D',"30-40"); return 0; } 

 

log文件输出结果:

[2011/01/11 03:52:44]: very good: 70-90,90-100 [2011/01/11 03:52:44]: good: 60-70 [2011/01/11 03:52:44]: same: 40-60 [2011/01/11 03:52:44]: error: 30-40