propagator/log.c

/*
 * Guillaume Cottenceau (gc@mandrakesoft.com)
 *
 * Copyright 2000 MandrakeSoft
 *
 * This software may be freely redistributed under the terms of the GNU
 * public license.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/*
 * Portions from Erik Troan (ewt@redhat.com)
 *
 * Copyright 1996 Red Hat Software
 *
 */

#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "stage1.h"

#include "log.h"


static FILE * logfile = NULL;


void vlog_message(const char * s, va_list args)
{
	fprintf(logfile, "* ");
	vfprintf(logfile, s, args);
	fprintf(logfile, "\n");
	fflush(logfile);
}


void log_message(const char * s, ...)
{
	va_list args;

	if (!logfile) {
		fprintf(stderr, "Log is not open!\n");
		return;
	}

	va_start(args, s);
	vlog_message(s, args);
	va_end(args);

	return;
}

void log_perror(char *msg)
{
	log_message("%s: %s", msg, strerror(errno));
}


void open_log(void)
{
	if (!IS_TESTING) {
		mknod("/dev/ttyprintk", S_IFCHR, MKDEV(5, 3));
		logfile = fopen("/dev/ttyprintk", "w");
		if (!logfile)
			logfile = fopen("/tmp/install.log", "a");
	}
	else
		logfile = fopen("debug.log", "w");
}

void close_log(void)
{
	if (logfile) {
		log_message("stage1: disconnecting life support systems");
		fclose(logfile);
	}
}

int redirect2log(int fd)
{
	int rc;
	if (!logfile) {
		fprintf(stderr, "%s: log file is not open", __func__);
		return -1;
	}
	rc = dup2(fileno(logfile), fd);
	if (rc < 0) {
		log_message("%s: dup2 %d: error: %s", __func__, fd, strerror(errno));
	}
	return rc;
}

int redirect2null(int fd)
{
	int nullfd = -1, newfd = -1;
	nullfd = open("/dev/null", O_RDONLY);
	if (nullfd < 0) {
		log_message("%s: open /dev/null: %s", __func__, strerror(errno));
		goto out;
	}
	newfd = dup2(nullfd, fd);
	if (newfd < 0) {
		log_message("%s: dup2: %s", __func__, strerror(errno));
		goto out;
	}
out:
	if (nullfd >= 0) {
		close(nullfd);
	}
	return newfd;
}