Set program name for print().

The printing facility is used by different programs, allow to set the
program name which prefixes the messages written to stdout.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>

pmc.c

@@ -553,6 +553,7 @@ int main(int argc, char *argv[])
 	pollfd[1].fd = fdarray.fd[FD_GENERAL];
 	pollfd[1].events = POLLIN|POLLPRI;
 
+	print_set_progname(progname);
 	print_set_syslog(1);
 	print_set_verbose(1);
 

print.c

@@ -27,6 +27,12 @@
 static int verbose = 0;
 static int print_level = LOG_INFO;
 static int use_syslog = 1;
+static const char *progname;
+
+void print_set_progname(const char *name)
+{
+	progname = name;
+}
 
 void print_set_syslog(int value)
 {
@@ -59,7 +65,8 @@ void print(int level, char const *format, ...)
 	va_end(ap);
 
 	if (verbose) {
-		fprintf(stdout, "ptp4l[%ld.%03ld]: %s\n",
+		fprintf(stdout, "%s[%ld.%03ld]: %s\n",
+			progname ? progname : "",
 			ts.tv_sec, ts.tv_nsec / 1000000, buf);
 		fflush(stdout);
 	}

print.h

@@ -27,6 +27,7 @@
 
 void print(int level, char const *format, ...);
 
+void print_set_progname(const char *name);
 void print_set_syslog(int value);
 void print_set_level(int level);
 void print_set_verbose(int value);

ptp4l.c

@@ -246,6 +246,7 @@ int main(int argc, char *argv[])
 		ds->clockQuality.clockClass = 255;
 	}
 
+	print_set_progname(progname);
 	print_set_verbose(cfg_settings.verbose);
 	print_set_syslog(cfg_settings.use_syslog);
 	print_set_level(cfg_settings.print_level);