linux-kernel - [PATCH 2/5] UML - print coredump limits

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Message-Id: <200703061832.l26IW6Ua006554@ccure.user-mode-linux.org>
Date:	Tue, 06 Mar 2007 13:32:06 -0500
From:	Jeff Dike <jdike@...toit.com>
To:	akpm@...l.org
cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: [PATCH 2/5] UML - print coredump limits

Print out core dump limits at boot time.  This is to allow core dumps
to be collected if something goes very wrong and to tell if a core
dump isn't going to happen because of a resource limit.

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
 arch/um/os-Linux/start_up.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

Index: test/arch/um/os-Linux/start_up.c
===================================================================
--- test.orig/arch/um/os-Linux/start_up.c	2007-03-06 10:21:43.000000000 -0500
+++ test/arch/um/os-Linux/start_up.c	2007-03-06 10:43:02.000000000 -0500
@@ -17,6 +17,7 @@
 #include <sys/time.h>
 #include <sys/wait.h>
 #include <sys/mman.h>
+#include <sys/resource.h>
 #include <asm/unistd.h>
 #include <asm/page.h>
 #include <sys/types.h>
@@ -329,8 +330,32 @@ static void __init check_ptrace(void)
 
 extern void check_tmpexec(void);
 
+static void check_coredump_limit(void)
+{
+	struct rlimit lim;
+	int err = getrlimit(RLIMIT_CORE, &lim);
+
+	if(err){
+		perror("Getting core dump limit");
+		return;
+	}
+
+	printf("Core dump limits :\n\tsoft - ");
+	if(lim.rlim_cur == RLIM_INFINITY)
+		printf("NONE\n");
+	else printf("%lu\n", lim.rlim_cur);
+
+	printf("\thard - ");
+	if(lim.rlim_max == RLIM_INFINITY)
+		printf("NONE\n");
+	else printf("%lu\n", lim.rlim_max);
+}
+
 void os_early_checks(void)
 {
+	/* Print out the core dump limits early */
+	check_coredump_limit();
+
 	check_ptrace();
 
 	/* Need to check this early because mmapping happens before the

-
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