linux-kernel - [PATCH 19/33] Block till request

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Date:	Thu, 20 Mar 2014 15:11:38 +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 19/33] Block till request

Block until input arrives on the socket.

Signed-off-by: Janani Venkataraman <jananive@...ux.vnet.ibm.com>
---
 src/coredump.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/src/coredump.c b/src/coredump.c
index c992c66..d93f4b2 100644
--- a/src/coredump.c
+++ b/src/coredump.c
@@ -349,6 +349,38 @@ int setup_server(void)
 	return 0;
 }
 
+/* Blocking on a request */
+int block_on_request(void)
+{
+	fd_set read;
+
+	do {
+		/* Initialise */
+		FD_ZERO(&read);
+		FD_SET(socket_fd, &read);
+
+		gencore_log("[%d]: Waiting on incoming request.\n", pid_log);
+
+		if (select(socket_fd + 1, &read, NULL, NULL, NULL) <= 0) {
+			/*
+			 * EINTR just means a signal is caught and hence, we need not
+			 * terminate for this error.
+			 */
+			if (errno != EINTR) {
+				gencore_log("[%d]: Error while waiting for connection requests.\n",
+						pid_log, strerror(errno));
+				close(socket_fd);
+				return -1;
+			}
+		}
+
+	} while(FD_ISSET(socket_fd, &read) == 0);
+
+	gencore_log("[%d]: Request found.\n", pid_log);
+
+	return 0;
+}
+
 /* Daemon for self dump */
 int daemon_dump(void)
 {
@@ -386,6 +418,19 @@ int daemon_dump(void)
 	/* Flush the log */
 	fflush(fp_log);
 
+	while (1) {
+
+		/* Blocks on request */
+		ret = block_on_request();
+		if (ret)
+			goto cleanup;
+
+		/* Flush the log */
+		fflush(fp_log);
+	}
+
+	return 0;
+
 cleanup:
 
 	fclose(fp_log);

--
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