Linux Linux program Exercise 17

Summary: Use Fputs () to write data to a file, to see the results in real time, you need to use Fflush to clear the buffer

/** Title: Write a daemon that writes the current time to the file Time.log every 3 seconds, * requires that the Init_daemon system call cannot be used. * */#include<stdio.h>#include<stdlib.h>#include<string.h>#include<time.h>#include<errno.h>#include<unistd.h>#include<sys/types.h>#include<sys/stat.h>voidGettime_now (Char*ptime) {time_t Tdata=0; //get current system timeTime (&tdata); //defining time structure body variables    structTM *eventtime =NULL; //turn time_t type to struct TM pointer typeEventtime = localtime (&tdata); //Tm_year represents year, starting from 1900    intT_year = Eventtime->tm_year +1900; //month, month starting from 0    intT_mon = Eventtime->tm_mon +1; //Day    intT_day = eventtime->Tm_mday; //hours    intT_hour = eventtime->Tm_hour; //points    intT_min = eventtime->tm_min; //seconds    intT_sec = eventtime->tm_sec; sprintf (Ptime,"%d-%d-%d%d:%d:%d\n", T_year, T_mon, T_day, T_hour, T_min, t_sec);}intMainvoid) {pid_t pid=Fork (); if(PID = =-1) {perror ("fork () Err"); return-1; }    if(PID = =0)    {        //create a new session periodSetsid (); //set the current directory as the root directoryChDir"/"); //Set directory PermissionsUmask0);        Close (Stderr_fileno);        Close (Stdin_fileno); FILE*PFA =NULL; PFA= fopen ("/home/test/1/time.log","a"); if(PFA = =NULL) {Perror ("fopen () Err"); return-1; }        //every 3 seconds        intseconds =0;  while(1) {seconds=3;  Do{seconds=sleep (seconds); }  while(Seconds >0); //Get current Time            Chartimearr[ -] = {0 };            Gettime_now (Timearr); strcat (Timearr,"\t\t print time \ n"); printf ("%s", Timearr); //Write Filefputs (Timearr, PFA); //Flush Buffersfflush (PFA); }    } Else if(PID >0) {exit (0); }    return-1;}

. suffixes:.c. OCC=Gccsrcs=hello.cobjs=$ (srcs:.c=. O) EXEC=serSRCS1=  TEC01.COBJS1=$ (srcs1:.c=. O) EXEC1=cltstart:$ (OBJS) $ (OBJS1)    -o $ (EXEC) $ (OBJS)     -o $ (EXEC1) $ (OBJS1)    "^_^-----OK------^_^". C.O:     -wall-g-o [email protected]-C $< clean:    -F $ (    Objs)F $ (EXEC)

Linux Linux program Exercise 17