parse linux system calls definitions

fixes #222

script.sh

@@ -171,6 +171,7 @@ parse_defs_C()
 
     # Parse function macros, e.g., in .S files
     perl -ne '/^\s*ENTRY\((\w+)\)/ and print "$1 function $.\n"' "$full_path"
+    perl -ne '/^SYSCALL_DEFINE[0-9]\(\s*(\w+)\W/ and print "sys_$1 function $.\n"' "$full_path"
 
     rm "$full_path"
     rmdir $tmp

t/100-basic.t

@@ -122,6 +122,13 @@ run_produces_ok('ident query (ENTRY that should not be detected, #150)',
     ],
     MUST_SUCCEED);
 
+run_produces_ok('ident query (existent, #228)',
+    [$query_py, qw(v5.4 ident sys_init_module C)],
+    [qr{^Symbol Definitions:}, qr{^Symbol References:},
+        { def => qr{syscall_define\.c.+\b1\b.+\bfunction\b} }
+    ],
+    MUST_SUCCEED);
+
 # Spot-check some files
 
 run_produces_ok('file query (nonexistent)',

t/tree/syscall_define.c

@@ -0,0 +1,3 @@
+SYSCALL_DEFINE3(init_module)
+{
+}