X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=daemon.c;h=945c5a39a094e8314c5667f57f0b6a8099b12b45;hp=d8b8519e42cbf20f32bdcde30055a807793e8c7a;hb=224ab3f14af8e08a8a7159160eccea75be30ffd1;hpb=9b406cbe5d20ba969713ca3d7a8033e697476d75

diff --git a/daemon.c b/daemon.c
index d8b8519e..945c5a39 100644
--- a/daemon.c
+++ b/daemon.c
@@ -11,6 +11,7 @@
 #include <sys/types.h> /* getgrnam() */
 #include <grp.h>
 #include <signal.h>
+#include <sys/resource.h>
 
 #include "para.h"
 #include "daemon.h"
@@ -37,12 +38,7 @@ struct daemon {
 
 static struct daemon the_daemon, *me = &the_daemon;
 
-/**
- * Activate default log colors.
- *
- * This should be called early if color support is wanted.
- */
-void daemon_set_default_log_colors(void)
+static void daemon_set_default_log_colors(void)
 {
 	int i;
 	static const char *default_log_colors[NUM_LOGLEVELS] = {
@@ -58,14 +54,12 @@ void daemon_set_default_log_colors(void)
 		color_parse_or_die(default_log_colors[i], me->log_colors[i]);
 }
 
-/**
+/*
  * Set the color for one loglevel.
  *
- * \param arg The loglevel/color specifier.
- *
- * \a arg must be of the form "ll:[fg [bg]] [attr]".
+ * arg must be of the form "ll:[fg [bg]] [attr]".
  */
-void daemon_set_log_color_or_die(char const *arg)
+static void daemon_set_log_color_or_die(char const *arg)
 {
 	char *p = strchr(arg, ':');
 	int ret, ll;
@@ -80,16 +74,55 @@ void daemon_set_log_color_or_die(char const *arg)
 	color_parse_or_die(p, me->log_colors[ll]);
 	return;
 err:
-	PARA_EMERG_LOG("%s: color syntax error\n", arg);
+	PARA_EMERG_LOG("%s: invalid color argument\n", arg);
 	exit(EXIT_FAILURE);
 }
 
+/**
+ * Initialize color mode if necessary.
+ *
+ * \param color_arg The argument given to --color.
+ * \param color_arg_auto The value for automatic color detection.
+ * \param color_arg_no The value to disable colored log messages.
+ * \param logfile_given In auto mode colors are disabled if this value is true.
+ * \param log_color_argv Color specifiers given to --log-color.
+ * \param argc Number of color specifiers in \a log_color_argv.
+ *
+ * If \a color_arg equals \a color_arg_no, color mode is disabled, i.e., calls
+ * to \a para_log() will not produce colored output. If \a color_arg == \a
+ * color_arg_auto, the function autodetects whether to activate colors.
+ * Otherwise color mode is enabled.
+ *
+ * If color mode is to be enabled, the strings in \a log_color_argv are parsed
+ * and the color scheme is updated accordingly. For each loglevel, the default
+ * colors apply if there is no log_color_argv for this loglevel.
+ */
+void daemon_init_colors_or_die(int color_arg, int color_arg_auto,
+		int color_arg_no, bool logfile_given, char **log_color_argv,
+		int argc)
+{
+	int i;
+
+	if (color_arg == color_arg_no)
+		return;
+	if (color_arg == color_arg_auto) {
+		if (logfile_given)
+			return;
+		if (!isatty(STDERR_FILENO))
+			return;
+	}
+	daemon_set_flag(DF_COLOR_LOG);
+	daemon_set_default_log_colors();
+	for (i = 0; i < argc; i++)
+		daemon_set_log_color_or_die(log_color_argv[i]);
+}
+
 /**
  * Init or change the name of the log file.
  *
  * \param logfile_name The full path of the logfile.
  */
-void daemon_set_logfile(char *logfile_name)
+void daemon_set_logfile(const char *logfile_name)
 {
 	free(me->logfile_name);
 	me->logfile_name = NULL;
@@ -102,7 +135,7 @@ void daemon_set_logfile(char *logfile_name)
  *
  * \param loglevel The smallest level that should be logged.
  */
-void daemon_set_loglevel(char *loglevel)
+void daemon_set_loglevel(const char *loglevel)
 {
 	int ret = get_loglevel_by_name(loglevel);
 
@@ -167,7 +200,7 @@ void daemonize(bool parent_waits)
 		goto err;
 	if (chdir("/") < 0)
 		goto err;
-	null = open("/dev/null", O_RDONLY);
+	null = open("/dev/null", O_RDWR);
 	if (null < 0)
 		goto err;
 	if (dup2(null, STDIN_FILENO) < 0)
@@ -217,11 +250,30 @@ void daemon_open_log_or_die(void)
 
 /**
  * Log the startup message containing the paraslash version.
+ *
+ * \param name The name of the executable.
+ *
+ * First the given \a name is prefixed with the string "para_". Next the git
+ * version is appended. The resulting string is logged with priority "INFO".
+ */
+void daemon_log_welcome(const char *name)
+{
+	PARA_INFO_LOG("welcome to para_%s-" PACKAGE_VERSION " \n", name);
+}
+
+/**
+ * Renice the calling process.
+ *
+ * \param prio The priority value to set.
+ *
+ * Errors are not considered fatal, but a warning message is logged if the
+ * underlying call to setpriority(2) fails.
  */
-void daemon_log_welcome(const char *whoami)
+void daemon_set_priority(int prio)
 {
-	PARA_INFO_LOG("welcome to %s " PACKAGE_VERSION " ("BUILD_DATE")\n",
-		whoami);
+	if (setpriority(PRIO_PROCESS, 0, prio) < 0)
+		PARA_WARNING_LOG("could not set priority to %d: %s\n", prio,
+			strerror(errno));
 }
 
 /**