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static char rcsid[] = "$Id: log.c,v 1.5 2006/02/03 16:53:26 golda Exp $";
/*
* log.c - Logging facilities for Essence system.
*
* Darren Hardy, hardy@cs.colorado.edu, February 1994
*
* ----------------------------------------------------------------------
* Copyright (c) 1994, 1995. All rights reserved.
*
* Mic Bowman of Transarc Corporation.
* Peter Danzig of the University of Southern California.
* Darren R. Hardy of the University of Colorado at Boulder.
* Udi Manber of the University of Arizona.
* Michael F. Schwartz of the University of Colorado at Boulder.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <sys/file.h>
#include <stdarg.h>
#include <stdlib.h>
#include "util.h"
/* Local functions */
static void standard_msg();
static void log_flush();
/* Local variables */
static FILE *fp_log = NULL;
static FILE *fp_errs = NULL;
static int pid;
static char *pname = NULL;
#if defined(USE_LOG_SYNC) && defined(HAVE_FLOCK)
static void lock_file(fp)
FILE *fp;
{
if (flock(fileno(fp), LOCK_EX) < 0)
log_errno("lockf");
if (fseek(fp, 0, SEEK_END) < 0)
log_errno("fseek");
}
static void unlock_file(fp)
FILE *fp;
{
if (flock(fileno(fp), LOCK_UN) < 0)
log_errno("lockf");
}
#else
#define lock_file(fp) /* nops */
#define unlock_file(fp)
#endif
/*
* init_log() - Initializes the logging routines. log() prints to
* FILE *a, and errorlog() prints to FILE *b;
*/
void init_log(a, b)
FILE *a, *b;
{
fp_log = a;
fp_errs = b;
pid = getpid();
pname = NULL;
}
void init_log3(pn, a, b)
char *pn;
FILE *a, *b;
{
fp_log = a;
fp_errs = b;
pid = getpid();
pname = strdup(pn);
}
/*
* glimpselog() - used like printf(3). Prints message to stdout.
*/
void glimpselog(char *fmt,...)
{
va_list ap;
if (fp_log == NULL)
return;
va_start(ap, fmt);
if (fp_log == NULL)
return;
lock_file(fp_log);
standard_msg(fp_log);
vfprintf(fp_log, fmt, ap);
va_end(ap);
log_flush(fp_log);
unlock_file(fp_log);
}
/*
* errorlog() - used like printf(3). Prints error message to stderr.
*/
void errorlog(char *fmt,...)
{
va_list ap;
if (fp_errs == NULL)
return;
va_start(ap, fmt);
if (fp_errs == NULL)
return;
lock_file(fp_errs);
standard_msg(fp_errs);
fprintf(fp_errs, "ERROR: ");
vfprintf(fp_errs, fmt, ap);
va_end(ap);
log_flush(fp_errs);
unlock_file(fp_errs);
}
/*
* fatal() - used like printf(3). Prints error message to stderr and exits
*/
void fatal(char *fmt,...)
{
va_list ap;
if (fp_errs == NULL)
exit(1);
va_start(ap, fmt);
if (fp_errs == NULL)
exit(1);
lock_file(fp_errs);
standard_msg(fp_errs);
fprintf(fp_errs, "FATAL: ");
vfprintf(fp_errs, fmt, ap);
va_end(ap);
log_flush(fp_errs);
unlock_file(fp_errs);
exit(1);
}
/*
* log_errno() - Same as perror(); doesn't print when errno == 0
*/
void log_errno(s)
char *s;
{
if (errno != 0)
errorlog("%s: %s\n", s, strerror(errno));
}
/*
* fatal_errno() - Same as perror()
*/
void fatal_errno(s)
char *s;
{
fatal("%s: %s\n", s, strerror(errno));
}
/*
* standard_msg() - Prints the standard pid and timestamp
*/
static void standard_msg(fp)
FILE *fp;
{
if (pname != NULL)
fprintf(fp, "%7s: ", pname);
else
fprintf(fp, "%7d: ", pid);
#ifdef LOG_TIMES
{
time_t t = time(NULL);
char buf[BUFSIZ];
strftime(buf, BUFSIZ - 1, "%y%m%d %H:%M:%S:", localtime(&t));
fprintf(fp, "%s ", buf);
}
#endif
}
static void log_flush(fp)
FILE *fp;
{
fflush(fp);
}
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