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/*
* log.c
*
* Generic log module.
*
* Usage: loginit(ProcessName, NameOfLogFile, LogLevel, appendMode);
* logging(level, msg, ...);
*
*/
/* --- include section --- */
#include "log.h"
#include <stdarg.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/* --- private variables --- */
static char *fp_pname;
static char *fp_fname;
static int fp_level;
static int fp_appmode;
static FILE *fp_log = NULL;
/* --- public functions --- */
void
loginit (char *pname, char *fname, int loglevel, int appendMode)
{
fp_pname = pname;
fp_fname = fname;
fp_level = loglevel;
fp_appmode = appendMode;
}
void
logging (int level, char *fmt, ...)
{
va_list ap;
char tbuf[24];
time_t curtime;
int fp_fd;
/* level of current message too high ? */
if (level > fp_level)
{
return;
}
/* open the log file, if necessary */
if (!fp_log)
{
fp_fd = open (fp_fname, O_CREAT|O_EXCL|O_WRONLY, S_IREAD|S_IWRITE);
if (fp_fd < 0)
{
fprintf (stderr,
"Cannot open log file '%s' [%s]\n", fp_fname,
strerror (errno));
exit (1);
}
fp_log = fdopen (fp_fd, "w");
if (fp_log == NULL)
{
fprintf (stderr,
"Cannot open log file '%s' [%s]\n", fp_fname,
strerror (errno));
exit (1);
}
}
/* construct the log entry */
time (&curtime);
strftime (tbuf, sizeof (tbuf), "%Y%m%d.%H%M%S", localtime (&curtime));
fprintf (fp_log, "%s (%s-%d): ", tbuf, fp_pname, getpid ());
va_start (ap, fmt);
vfprintf (fp_log, fmt, ap);
va_end (ap);
fprintf (fp_log, "\n");
fflush (fp_log);
}
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