merges r30525 from trunk into ruby_1_9_2.

--
	* io.c (rb_f_syscall): Add 64bit Linux support. Some syscall takes
	  long type arguments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30573 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/io.c b/io.c
index 0a110f9ea2..099ad2c756 100644
--- a/io.c
+++ b/io.c
@@ -7555,6 +7555,18 @@ rb_f_syscall(int argc, VALUE *argv)
 # else
 #  error ---->> it is asserted that __syscall takes the first argument and returns retval in 64bit signed integer. <<----
 # endif
+#elif defined linux
+# define SYSCALL syscall
+# define NUM2SYSCALLID(x) NUM2LONG(x)
+# define RETVAL2NUM(x) LONG2NUM(x)
+    /*
+     * Linux man page says, syscall(2) function prototype is below.
+     *
+     *     int syscall(int number, ...);
+     *
+     * But, it's incorrect. Actual one takes and returned long. (see unistd.h)
+     */
+    long num, retval = -1;
 #else
 # define SYSCALL syscall
 # define NUM2SYSCALLID(x) NUM2INT(x)