make use of setproctitle() to change the process title of the daemon processes. This is especially useful to distuingish the main daemon and the chroot() helper process.

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@908 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

1 files changed, 102 insertions, 0 deletions

diff --git a/avahi-daemon/setproctitle.c b/avahi-daemon/setproctitle.c
new file mode 100644
index 0000000..819f7b0
--- /dev/null
+++ b/avahi-daemon/setproctitle.c
@@ -0,0 +1,102 @@
+/* $Id$ */
+
+/***
+  This file is part of avahi.
+ 
+  avahi is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+ 
+  avahi 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 Lesser General
+  Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public
+  License along with avahi; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+
+#include <avahi-common/malloc.h>
+
+#include "setproctitle.h"
+
+#if !defined(HAVE_SETPROCTITLE) && defined(__linux__)
+static char** argv_buffer = NULL;
+static size_t argv_size = 0;
+
+#if !HAVE_DECL_ENVIRON
+extern char **environ;
+#endif
+
+#endif
+
+void avahi_init_proc_title(int argc, char **argv) {
+
+#if !defined(HAVE_SETPROCTITLE) && defined(__linux__)
+
+    unsigned i;
+    char **new_environ, *endptr;
+
+    /* This code is really really ugly. We make some memory layout
+     * assumptions and reuse the environment array as memory to store
+     * our process title in */
+
+    for (i = 0; environ[i]; i++);
+
+    endptr = i ? environ[i-1] + strlen(environ[i-1]) : argv[argc-1] + strlen(argv[argc-1]);
+
+    argv_buffer = argv;
+    argv_size = endptr - argv_buffer[0];
+
+    /* Make a copy of environ */
+    
+    new_environ = avahi_malloc(sizeof(char*) * (i + 1));
+    for (i = 0; environ[i]; i++)
+        new_environ[i] = avahi_strdup(environ[i]);
+    new_environ[i] = NULL;
+
+    environ = new_environ;
+
+#endif
+}	
+
+void avahi_set_proc_title(const char *fmt,...) {
+#ifdef HAVE_SETPROCTITLE
+    char t[256];
+
+    va_list ap;
+    va_start(ap);
+    vsnprintf(t, sizeof(t), fmt, ap);
+    va_end(ap);
+
+    setproctitle("-%s", t);
+#elif __linux__
+    size_t l;
+    va_list ap;
+    
+    if (!argv_buffer)
+        return;
+    
+    va_start(ap, fmt);
+    vsnprintf(argv_buffer[0], argv_size, fmt, ap);
+    va_end(ap);
+
+    l = strlen(argv_buffer[0]);
+    
+    memset(argv_buffer[0] + l, 0, argv_size - l);
+    argv_buffer[1] = NULL;
+#endif
+}