gcrypt: Always initialize result pointer.

[paraslash.git] / daemon.c

diff --git a/daemon.c b/daemon.c
index b0d8fd744c8f7f0d208afd5f96ca03fe336ece16..7c625bbea9d84c5ac9b37a22253346576cbb7183 100644 (file)
--- a/daemon.c
+++ b/daemon.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1997-2014 Andre Noll <maan@tuebingen.mpg.de>
+ * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -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] = {
@@ -61,11 +57,9 @@ void daemon_set_default_log_colors(void)
 /**
  * Set the color for one loglevel.
  *
- * \param arg The loglevel/color specifier.
- *
- * \a arg must be of the form "ll:[fg [bg]] [attr]".
+ * \param arg Must be of the form "ll:[fg [bg]] [attr]".
  */
-void daemon_set_log_color_or_die(char const *arg)
+void daemon_set_log_color_or_die(const char *arg)
 {
        char *p = strchr(arg, ':');
        int ret, ll;
@@ -80,16 +74,50 @@ 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.
+ *
+ * If color_arg equals color_arg_no, color mode is disabled. That is, calls to
+ * para_log() will not produce colored output. If color_arg equals
+ * color_arg_auto, the function detects automatically whether to activate
+ * colors. Otherwise color mode is enabled.
+ *
+ * If color mode is to be enabled, the default colors are set for each
+ * loglevel. They can be overwritten by calling daemon_set_log_color_or_die().
+ *
+ * \return Whether colors have been enabled by the function.
+ */
+bool daemon_init_colors_or_die(int color_arg, int color_arg_auto,
+               int color_arg_no, bool logfile_given)
+{
+       if (color_arg == color_arg_no)
+               return false;
+       if (color_arg == color_arg_auto) {
+               if (logfile_given)
+                       return false;
+               if (!isatty(STDERR_FILENO))
+                       return false;
+       }
+       daemon_set_flag(DF_COLOR_LOG);
+       daemon_set_default_log_colors();
+       return true;
+}
+
 /**
  * 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 +130,7 @@ 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);
 
@@ -122,18 +150,6 @@ void daemon_set_flag(unsigned flag)
        me->flags |= flag;
 }
 
-/**
- * Clear one of the daemon config flags.
- *
- * \param flag The flag to clear.
- *
- * \sa \ref daemon_flags.
- */
-void daemon_clear_flag(unsigned flag)
-{
-       me->flags &= ~flag;
-}
-
 static bool daemon_test_flag(unsigned flag)
 {
        return me->flags & flag;
@@ -179,7 +195,7 @@ 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)
@@ -223,16 +239,36 @@ void daemon_open_log_or_die(void)
                        strerror(errno));
                exit(EXIT_FAILURE);
        }
-       setlinebuf(me->logfile);
+       /* equivalent to setlinebuf(), but portable */
+       setvbuf(me->logfile, NULL, _IOLBF, 0);
 }
 
 /**
  * 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 *whoami)
+void daemon_log_welcome(const char *name)
 {
-       PARA_INFO_LOG("welcome to %s " PACKAGE_VERSION " ("BUILD_DATE")\n",
-               whoami);
+       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_set_priority(int prio)
+{
+       if (setpriority(PRIO_PROCESS, 0, prio) < 0)
+               PARA_WARNING_LOG("could not set priority to %d: %s\n", prio,
+                       strerror(errno));
 }
 
 /**