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#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
static FILE *LOG;
// close the logfile
void LogClose(void)
{
if(LOG) {
fclose(LOG);
LOG=NULL;
}
}
// open the logfile
void LogOpen(char *logfile)
{
if(LOG) LogClose(); // close old logfile when necessary
fclose(stdin);
umask(0066); // logfiles should have mode 600
if(!(LOG=fopen(logfile, "a")))
fprintf(stderr,"Warning: Unable to open logfile \"%s\" for writing (%s)\n", logfile, strerror(errno));
}
// write one log entry
void Log(char *fmt, ...)
{
time_t tt = time(NULL);
char *tm = ctime(&tt);
va_list ap;
if(!LOG) return;
tm[strlen(tm)-1]=0;
va_start(ap, fmt);
// fprintf(LOG, "%s (%i) ", tm, getpid());
fprintf(LOG, "%010lu:%05i ", tt, getpid());
vfprintf(LOG, fmt, ap);
fprintf(LOG, "\n");
va_end(ap);
fflush(LOG);
}
// log error occured in some function
void LogError(char *fnct)
{
Log("%s(): %s", fnct, strerror(errno));
exit(-1);
}
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