Linux/C + + log printing function

Macro definition Log file name

#define PROCESSNAME "Log_filename"


When the log file is larger than 5M, the file is deleted and the interface uses the method reference printf
voidWritelog (Const Char*FM, ...) {    intBuflen =5120; CharBuf[buflen]; inti =0; memset (BUF,0, Buflen);    Va_list args;    Va_start (args, FM);    vsnprintf (buf, Buflen, Fm,args);    Va_end (args); printf ("%s\n", BUF); FILE* logfile=NULL; Charlogpath[ -] = {0}; snprintf (LogPath,sizeof(LogPath),"/var/log/"); if(Access (LogPath,0)!=0)    {        Charcmdstr[ the] = {0}; sprintf (Cmdstr,"mkdir-p%s", LogPath);    System (CMDSTR); }    Charfname[ the]; Charlongtime[ $];    time_t T; memset (fname,0,sizeof(fname)); Time (&t); structTM Local = {0}; Localtime_r (&t, &local); sprintf (longtime,"%04d-%02d-%02d%02d:%02d:%02d", local.tm_year+1900, Local.tm_mon+1, Local.tm_mday, Local.tm_hour, Local.tm_min, local.tm_sec); sprintf (fname,"%s/%s", LogPath, PROCESSNAME);  for(i=0; I <3; i++) {logfile= fopen (fname,"AB"); if(logfile) Break; Sleep (1); }    if(logfile) {//Determine file size        if(Ftell (logfile) <5*1024x768*1024x768)//5M        {            //Date Time            Const Char* Ptemp =longtime; Fwrite (Ptemp,1, strlen (ptemp), logfile); Fwrite (" ",1,1, logfile); //contentFwrite (BUF,1, strlen (BUF), logfile); Fwrite ("\ r \ n",1,3, logfile);        Fclose (logfile); }        Else{fclose (logfile);        Remove (fname); }    }}

Linux/C + + log printing function