satd: exec to an image without init text

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

2 files changed, 53 insertions, 4 deletions

diff --git a/src/satd-diminished.c b/src/satd-diminished.c
new file mode 100644
index 0000000..ed885c7
--- /dev/null
+++ b/src/satd-diminished.c
@@ -0,0 +1,50 @@
+/**
+ * Copyright © 2015  Mattias Andrée <maandree@member.fsf.org>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <unistd.h>
+
+
+
+/**
+ * The file descriptor for the socket.
+ */
+#define SOCK_FILENO  3
+
+
+
+/**
+ * The sat daemon.
+ * 
+ * @param   argc  Should be 3.
+ * @param   argv  The name of the process, the pathname of the socket,
+ *                and $SAT_HOOK_PATH (the pathname of the hook-script.)
+ * @return  0     The process was successful.
+ * @return  1     The process failed queuing the job.
+ */
+int
+main(int argc, char *argv[])
+{
+	close(SOCK_FILENO);
+	unlink(argv[1]);
+	return 0;
+	(void) argc;
+}
+
diff --git a/src/satd.c b/src/satd.c
index 74b190f..a5b09ff 100644
--- a/src/satd.c
+++ b/src/satd.c
@@ -218,10 +218,9 @@ main(int argc, char *argv[])
 	/* Daemonise. */
 	t (foreground ? 0 : daemonise("satd", DAEMONISE_KEEP_FDS, sock, -1));
 
-	close(sock);
-	unlink(address.sun_path);
-	undaemonise();
-	return 0;
+	/* Change to a process image without all this initialisation text. */
+	execl(LIBEXEC "/" PACKAGE "/satd-diminished", argv0,
+	      address.sun_path, getenv("SAT_HOOK_PATH"), NULL);
 
 fail:
 	if (errno)