wasi: fix up wasi tests for ibmi

ibmi now reports os400 instead of aix

- update platform check in poll to allow for os400
- update wasi-sdk level to 20
  - document the level of wasi-sdk used to compile the tests
  - remove platform check in readdir test as it does not seem to be needed
    with wasi-sdk version 20
  - comment out tests for some clocks which are no longer available when
    compiling with wasi-sdk level 20. These may be added back after
    WebAssembly/wasi-libc#266 is resolved.

Signed-off-by: Michael Dawson <midawson@redhat.com>

test/wasi/README.md

@@ -1,9 +1,15 @@
 # WASI Tests
 
-Compile with clang and `wasm32-wasi` target. The clang version used must be
-built with wasi-libc. You can specify the location for clang and the sysroot
-if needed when running make:
+Compile with clang and `wasm32-wasi` target by using the wasi-sdk
+[version 20](https://github.com/WebAssembly/wasi-sdk/releases/tag/wasi-sdk-20)
 
+Install wasi-sdk and then set WASI_SDK_PATH to the root of the install.
+
+You can then rebuild the wasm for the tests by running:
 ```bash
-make CC=/usr/local/opt/llvm/bin/clang SYSROOT=/path/to/wasi-libc/sysroot
+make CC=${WASI_SDK_PATH}/bin/clang SYSROOT=${WASI_SDK_PATH}/share/wasi-sysroot
 ```
+
+If you update the version of the wasi-sdk to be used for the compile
+remove all of the *.wasm files in the wasm directory to ensure
+you rebuild/test all of the tests with the new version.

test/wasi/c/clock_getres.c

@@ -10,8 +10,11 @@ int main() {
   assert(r == 0);
   r = clock_getres(CLOCK_MONOTONIC, &ts);
   assert(r == 0);
-  r = clock_getres(CLOCK_PROCESS_CPUTIME_ID, &ts);
-  assert(r == 0);
-  r = clock_getres(CLOCK_THREAD_CPUTIME_ID, &ts);
-  assert(r == 0);
+  // don't run these tests until
+  // https://github.com/WebAssembly/wasi-libc/issues/266
+  // is resolved
+  // r = clock_getres(CLOCK_PROCESS_CPUTIME_ID, &ts);
+  // assert(r == 0);
+  // r = clock_getres(CLOCK_THREAD_CPUTIME_ID, &ts);
+  // assert(r == 0);
 }

test/wasi/c/poll.c

@@ -10,11 +10,11 @@ int main(void) {
   time_t before, now;
   int ret;
   char* platform;
-  int is_aix;
+  int is_aix_or_os400;
   int is_win;
 
   platform = getenv("NODE_PLATFORM");
-  is_aix = platform != NULL && 0 == strcmp(platform, "aix");
+  is_aix_or_os400 = platform != NULL && (0 == strcmp(platform, "aix") || 0 == strcmp(platform, "os400"));
   is_win = platform != NULL && 0 == strcmp(platform, "win32");
 
   // Test sleep() behavior.
@@ -64,7 +64,7 @@ int main(void) {
   ret = poll(fds, 1, 2000);
   assert(ret == 1);
 
-  if (is_aix)
+  if (is_aix_or_os400)
     assert(fds[0].revents == POLLIN);
   else
     assert(fds[0].revents == (POLLHUP | POLLIN));

test/wasi/c/readdir.c

@@ -14,7 +14,6 @@ int main() {
 
   platform = getenv("NODE_PLATFORM");
   assert(platform != NULL);
-  has_d_type = (0 != strcmp(platform, "aix") && 0 != strcmp(platform, "sunos"));
 
   dir = opendir("/sandbox");
   assert(dir != NULL);
@@ -25,17 +24,9 @@ int main() {
     if (strcmp(entry->d_name, "input.txt") == 0 ||
         strcmp(entry->d_name, "input2.txt") == 0 ||
         strcmp(entry->d_name, "notadir") == 0) {
-      if (has_d_type) {
         assert(entry->d_type == DT_REG);
-      } else {
-        assert(entry->d_type == DT_UNKNOWN);
-      }
     } else if (strcmp(entry->d_name, "subdir") == 0) {
-      if (has_d_type) {
         assert(entry->d_type == DT_DIR);
-      } else {
-        assert(entry->d_type == DT_UNKNOWN);
-      }
     } else {
       assert("unexpected file");
     }