Add functions for logging messages in kernel style.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

makefile

@@ -24,7 +24,7 @@ CFLAGS	= -Wall $(INC) $(DEBUG)
 LDFLAGS	=
 LDLIBS	= -lm -lrt
 PRG	= linuxptp
-OBJ	= phc.o
+OBJ	= phc.o print.o
 
 SRC	= $(OBJ:.o=.c)
 DEPEND	= $(OBJ:.o=.d)

print.c

@@ -0,0 +1,39 @@
+/**
+ * @file print.c
+ * @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+static int verbose = 1;
+
+void print(int level, char const *format, ...)
+{
+	pid_t pid = getpid();
+	va_list ap;
+	char buf[1024];
+
+	va_start(ap, format);
+	vsnprintf(buf, sizeof(buf), format, ap);
+	va_end(ap);
+
+	if (verbose) {
+		fprintf(stdout, "linuxptp[%d]: %s\n", pid, buf);
+	}
+}

print.h

@@ -0,0 +1,36 @@
+/**
+ * @file print.h
+ * @brief Logging support functions
+ * @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef HAVE_PRINT_H
+#define HAVE_PRINT_H
+
+#include <syslog.h>
+
+void print(int level, char const *format, ...);
+
+#define pr_emerg(x...)   print(LOG_EMERG, x)
+#define pr_alert(x...)   print(LOG_ALERT, x)
+#define pr_crit(x...)    print(LOG_CRIT, x)
+#define pr_err(x...)     print(LOG_ERR, x)
+#define pr_warning(x...) print(LOG_WARNING, x)
+#define pr_notice(x...)  print(LOG_NOTICE, x)
+#define pr_info(x...)    print(LOG_INFO, x)
+#define pr_debug(x...)   print(LOG_DEBUG, x)
+
+#endif