nobu	2018-05-08 08:14:07 +0900 (Tue, 08 May 2018)

  New Revision: 63351

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63351

  Log:
    cont.c: refined error message
    
    * cont.c (fiber_machine_stack_alloc): refined the error message on
      failure at setting a guard page.

  Modified files:
    trunk/cont.c
Index: cont.c
===================================================================
--- cont.c	(revision 63350)
+++ cont.c	(revision 63351)
@@ -769,6 +769,8 @@ fiber_entry(void *arg) https://github.com/ruby/ruby/blob/trunk/cont.c#L769
 #define FIBER_STACK_FLAGS (MAP_PRIVATE | MAP_ANON)
 #endif
 
+#define ERRNOMSG strerror(errno)
+
 static char*
 fiber_machine_stack_alloc(size_t size)
 {
@@ -793,13 +795,13 @@ fiber_machine_stack_alloc(size_t size) https://github.com/ruby/ruby/blob/trunk/cont.c#L795
 	errno = 0;
 	ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, FIBER_STACK_FLAGS, -1, 0);
 	if (ptr == MAP_FAILED) {
-	    rb_raise(rb_eFiberError, "can't alloc machine stack to fiber: %s", strerror(errno));
+	    rb_raise(rb_eFiberError, "can't alloc machine stack to fiber: %s", ERRNOMSG);
 	}
 
 	/* guard page setup */
 	page = ptr + STACK_DIR_UPPER(size - RB_PAGE_SIZE, 0);
 	if (mprotect(page, RB_PAGE_SIZE, PROT_NONE) < 0) {
-	    rb_raise(rb_eFiberError, "mprotect failed");
+	    rb_raise(rb_eFiberError, "can't set a guard page: %s", ERRNOMSG);
 	}
     }
 

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