Adding path runtime test

Adding path runtime test that checks on close being called
on file within './testprogs/syscall read' test prog.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>

tests/runtime/call

@@ -235,3 +235,10 @@ NAME print_hist_with_large_top_arg
 RUN bpftrace -e 'BEGIN { print("BEGIN"); @[1] = hist(10); @[2] = hist(20); @[3] = hist(30); print(@, 10); print("END"); clear(@); exit(); } '
 EXPECT BEGIN\n@\[1\]:(.*\n)+@\[2\]:(.*\n)+@\[3\]:(.*\n)+END
 TIMEOUT 1
+
+NAME path
+RUN bpftrace -ve 'kfunc:filp_close { $f = path(args->filp->f_path); if (!strncmp($f, "/tmp/bpftrace_runtime_test_syscall_gen_read_temp", 49)) { printf("OK\n"); exit(); } }'
+EXPECT OK
+REQUIRES_FEATURE dpath
+TIMEOUT 5
+AFTER ./testprogs/syscall read

tests/runtime/engine/parser.py

@@ -98,7 +98,7 @@ def __read_test_struct(test, test_suite):
                 arch = [x.strip() for x in line.split("|")]
             elif item_name == 'REQUIRES_FEATURE':
                 feature_requirement = {x.strip() for x in line.split(" ")}
-                unknown = feature_requirement - {"loop", "btf", "probe_read_kernel"}
+                unknown = feature_requirement - {"loop", "btf", "probe_read_kernel", "dpath"}
                 if len(unknown) > 0:
                     raise UnknownFieldError('%s is invalid for REQUIRES_FEATURE. Suite: %s' % (','.join(unknown), test_suite))
             else:

tests/runtime/engine/utils.py

@@ -98,6 +98,7 @@ def __get_bpffeature():
         bpffeature["loop"] = output.find("Loop support: yes") != -1
         bpffeature["probe_read_kernel"] = output.find("probe_read_kernel: yes") != -1
         bpffeature["btf"] = output.find("btf (depends on Build:libbpf): yes") != -1
+        bpffeature["dpath"] = output.find("dpath: yes") != -1
         return bpffeature
 
     @staticmethod