linux-kernel - [PATCH 25/33] Systemd Socket ID retrieval

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Date:	Thu, 20 Mar 2014 15:12:27 +0530
From:	Janani Venkataraman <jananive@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	amwang@...hat.com, procps@...elists.org, rdunlap@...otime.net,
	james.hogan@...tec.com, aravinda@...ux.vnet.ibm.com, hch@....de,
	mhiramat@...hat.com, jeremy.fitzhardinge@...rix.com,
	xemul@...allels.com, d.hatayama@...fujitsu.com, coreutils@....org,
	kosaki.motohiro@...fujitsu.com, adobriyan@...il.com,
	util-linux@...r.kernel.org, tarundsk@...ux.vnet.ibm.com,
	vapier@...too.org, roland@...k.frob.com, ananth@...ux.vnet.ibm.com,
	gorcunov@...nvz.org, avagin@...nvz.org, oleg@...hat.com,
	eparis@...hat.com, suzuki@...ux.vnet.ibm.com, andi@...stfloor.org,
	tj@...nel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: [PATCH 25/33] Systemd Socket ID retrieval

The socket created by systemd, waits for connections. Once it accepts a
connection, it starts the service which handles the request for a dump.

>>From this service, we fetch the socket ID and perform the dump.

This is not functional yet, due to the absence of the sd-daemon.h header file.
For this we need to have the correct version of systemd which has this socket
option enabled.

Signed-off-by: Janani Venkataraman <jananive@...ux.vnet.ibm.com>
---
 src/coredump.c |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/coredump.c b/src/coredump.c
index ab120b9..98a7146 100755
--- a/src/coredump.c
+++ b/src/coredump.c
@@ -39,6 +39,9 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <coredump.h>
+#if HAVE_SYSTEMD_SOCKET_SUPPORT
+#include <sd-daemon.h>
+#endif
 
 /* Main Socket */
 int socket_fd;
@@ -670,6 +673,35 @@ cleanup:
 /* Systemd socket for self dump */
 int socket_dump(void)
 {
+	int n, ret;
+	char core_file[CORE_FILE_NAME_SZ];
+	struct ucred client_info;
+
+	/* Fetching the Socket ID from systemd */
+	n = sd_listen_fds(0);
+	if (n > 1) {
+		gencore_log("Too many file descriptors received.\n");
+		return -1;
+	} else if (n == 1)
+		new_sock = SD_LISTEN_FDS_START + 0;
+	else
+		return -1;
+
+	/* Receive the message */
+	ret = receive_core_filename(core_file);
+	if (ret)
+		return -1;
+
+	/* Fetch client PID */
+	ret = get_client_pid(&client_info);
+	if (ret)
+		return -1;
+
+	/* Dump process */
+	ret = dump_task(&client_info, core_file);
+	if (ret)
+		return -1;
+
 	return 0;
 }
 #endif

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