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@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 5178eba9afa5..1244179e6c83 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -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