diff --git a/src/lib/libsyscall.js b/src/lib/libsyscall.js
index cbc5d3d0a5774..9769e87d4d9cd 100644
--- a/src/lib/libsyscall.js
+++ b/src/lib/libsyscall.js
@@ -199,12 +199,18 @@ var SyscallsLibrary = {
     if (fdPtr == 0) {
       throw new FS.ErrnoError({{{ cDefs.EFAULT }}});
     }
-    if (flags && flags != {{{ cDefs.O_CLOEXEC }}}) {
+    var validFlags = {{{ cDefs.O_CLOEXEC }}} | {{{ cDefs.O_NONBLOCK }}};
+    if (flags & ~validFlags) {
       throw new FS.ErrnoError({{{ cDefs.ENOTSUP }}});
     }
 
     var res = PIPEFS.createPipe();
 
+    if (flags & {{{ cDefs.O_NONBLOCK }}}) {
+      FS.getStream(res.readable_fd).flags |= {{{ cDefs.O_NONBLOCK }}};
+      FS.getStream(res.writable_fd).flags |= {{{ cDefs.O_NONBLOCK }}};
+    }
+
     {{{ makeSetValue('fdPtr', 0, 'res.readable_fd', 'i32') }}};
     {{{ makeSetValue('fdPtr', 4, 'res.writable_fd', 'i32') }}};
 
diff --git a/test/codesize/test_codesize_cxx_ctors1.json b/test/codesize/test_codesize_cxx_ctors1.json
index dff56a4063fb0..cb4134f37a55f 100644
--- a/test/codesize/test_codesize_cxx_ctors1.json
+++ b/test/codesize/test_codesize_cxx_ctors1.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19194,
-  "a.out.js.gz": 7969,
+  "a.out.js.gz": 7992,
   "a.out.nodebug.wasm": 132638,
-  "a.out.nodebug.wasm.gz": 49927,
+  "a.out.nodebug.wasm.gz": 50025,
   "total": 151832,
-  "total_gz": 57896,
+  "total_gz": 58017,
   "sent": [
     "__cxa_throw",
     "_abort_js",
diff --git a/test/codesize/test_codesize_cxx_ctors2.json b/test/codesize/test_codesize_cxx_ctors2.json
index fb2e77ec4ae92..1a62e049e7ec2 100644
--- a/test/codesize/test_codesize_cxx_ctors2.json
+++ b/test/codesize/test_codesize_cxx_ctors2.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19171,
-  "a.out.js.gz": 7957,
+  "a.out.js.gz": 7978,
   "a.out.nodebug.wasm": 132064,
-  "a.out.nodebug.wasm.gz": 49586,
+  "a.out.nodebug.wasm.gz": 49696,
   "total": 151235,
-  "total_gz": 57543,
+  "total_gz": 57674,
   "sent": [
     "__cxa_throw",
     "_abort_js",
diff --git a/test/codesize/test_codesize_cxx_except.json b/test/codesize/test_codesize_cxx_except.json
index c29dbd2b26b46..ce7ea8ace8d37 100644
--- a/test/codesize/test_codesize_cxx_except.json
+++ b/test/codesize/test_codesize_cxx_except.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 23174,
-  "a.out.js.gz": 8960,
+  "a.out.js.gz": 8991,
   "a.out.nodebug.wasm": 172516,
-  "a.out.nodebug.wasm.gz": 57438,
+  "a.out.nodebug.wasm.gz": 57821,
   "total": 195690,
-  "total_gz": 66398,
+  "total_gz": 66812,
   "sent": [
     "__cxa_begin_catch",
     "__cxa_end_catch",
diff --git a/test/codesize/test_codesize_cxx_except_wasm.json b/test/codesize/test_codesize_cxx_except_wasm.json
index cb737cf73678b..fdb170e6ac6ae 100644
--- a/test/codesize/test_codesize_cxx_except_wasm.json
+++ b/test/codesize/test_codesize_cxx_except_wasm.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19026,
-  "a.out.js.gz": 7904,
+  "a.out.js.gz": 7926,
   "a.out.nodebug.wasm": 147922,
-  "a.out.nodebug.wasm.gz": 55312,
+  "a.out.nodebug.wasm.gz": 55472,
   "total": 166948,
-  "total_gz": 63216,
+  "total_gz": 63398,
   "sent": [
     "_abort_js",
     "_tzset_js",
diff --git a/test/codesize/test_codesize_cxx_except_wasm_legacy.json b/test/codesize/test_codesize_cxx_except_wasm_legacy.json
index 71fbc6b06eb6d..409de390dc16a 100644
--- a/test/codesize/test_codesize_cxx_except_wasm_legacy.json
+++ b/test/codesize/test_codesize_cxx_except_wasm_legacy.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19100,
-  "a.out.js.gz": 7929,
+  "a.out.js.gz": 7951,
   "a.out.nodebug.wasm": 145729,
-  "a.out.nodebug.wasm.gz": 54945,
+  "a.out.nodebug.wasm.gz": 55117,
   "total": 164829,
-  "total_gz": 62874,
+  "total_gz": 63068,
   "sent": [
     "_abort_js",
     "_tzset_js",
diff --git a/test/codesize/test_codesize_cxx_lto.json b/test/codesize/test_codesize_cxx_lto.json
index f92589e8aecc0..4f963080a6973 100644
--- a/test/codesize/test_codesize_cxx_lto.json
+++ b/test/codesize/test_codesize_cxx_lto.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 18563,
-  "a.out.js.gz": 7666,
+  "a.out.js.gz": 7678,
   "a.out.nodebug.wasm": 101956,
-  "a.out.nodebug.wasm.gz": 39461,
+  "a.out.nodebug.wasm.gz": 39539,
   "total": 120519,
-  "total_gz": 47127,
+  "total_gz": 47217,
   "sent": [
     "a (emscripten_resize_heap)",
     "b (_setitimer_js)",
diff --git a/test/codesize/test_codesize_cxx_mangle.json b/test/codesize/test_codesize_cxx_mangle.json
index f2ddec2dbd75d..57db9de76d4d4 100644
--- a/test/codesize/test_codesize_cxx_mangle.json
+++ b/test/codesize/test_codesize_cxx_mangle.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 23224,
-  "a.out.js.gz": 8983,
+  "a.out.js.gz": 9014,
   "a.out.nodebug.wasm": 238957,
-  "a.out.nodebug.wasm.gz": 79847,
+  "a.out.nodebug.wasm.gz": 80026,
   "total": 262181,
-  "total_gz": 88830,
+  "total_gz": 89040,
   "sent": [
     "__cxa_begin_catch",
     "__cxa_end_catch",
diff --git a/test/codesize/test_codesize_cxx_noexcept.json b/test/codesize/test_codesize_cxx_noexcept.json
index 4881c4a93cac7..ddb03f6a683a0 100644
--- a/test/codesize/test_codesize_cxx_noexcept.json
+++ b/test/codesize/test_codesize_cxx_noexcept.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19194,
-  "a.out.js.gz": 7969,
+  "a.out.js.gz": 7992,
   "a.out.nodebug.wasm": 134661,
-  "a.out.nodebug.wasm.gz": 50777,
+  "a.out.nodebug.wasm.gz": 50866,
   "total": 153855,
-  "total_gz": 58746,
+  "total_gz": 58858,
   "sent": [
     "__cxa_throw",
     "_abort_js",
diff --git a/test/codesize/test_codesize_cxx_wasmfs.json b/test/codesize/test_codesize_cxx_wasmfs.json
index 9d83f3e7f89b1..d55085fd5a626 100644
--- a/test/codesize/test_codesize_cxx_wasmfs.json
+++ b/test/codesize/test_codesize_cxx_wasmfs.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 7023,
-  "a.out.js.gz": 3310,
+  "a.out.js.gz": 3314,
   "a.out.nodebug.wasm": 172714,
-  "a.out.nodebug.wasm.gz": 63316,
+  "a.out.nodebug.wasm.gz": 63360,
   "total": 179737,
-  "total_gz": 66626,
+  "total_gz": 66674,
   "sent": [
     "__cxa_throw",
     "_abort_js",
diff --git a/test/codesize/test_codesize_file_preload.json b/test/codesize/test_codesize_file_preload.json
index a84ee7c65dad3..f0ae4eb04e2ae 100644
--- a/test/codesize/test_codesize_file_preload.json
+++ b/test/codesize/test_codesize_file_preload.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 22141,
-  "a.out.js.gz": 9184,
+  "a.out.js.gz": 9193,
   "a.out.nodebug.wasm": 1648,
   "a.out.nodebug.wasm.gz": 939,
   "total": 23789,
-  "total_gz": 10123,
+  "total_gz": 10132,
   "sent": [
     "a (fd_write)"
   ],
diff --git a/test/codesize/test_codesize_files_js_fs.json b/test/codesize/test_codesize_files_js_fs.json
index 78a3cf7f21ebf..fdd2f2e59de0f 100644
--- a/test/codesize/test_codesize_files_js_fs.json
+++ b/test/codesize/test_codesize_files_js_fs.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 17834,
-  "a.out.js.gz": 7308,
+  "a.out.js.gz": 7318,
   "a.out.nodebug.wasm": 381,
   "a.out.nodebug.wasm.gz": 260,
   "total": 18215,
-  "total_gz": 7568,
+  "total_gz": 7578,
   "sent": [
     "a (fd_write)",
     "b (fd_read)",
diff --git a/test/codesize/test_codesize_files_wasmfs.json b/test/codesize/test_codesize_files_wasmfs.json
index 327251e75f6b3..f6262645155cd 100644
--- a/test/codesize/test_codesize_files_wasmfs.json
+++ b/test/codesize/test_codesize_files_wasmfs.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 5465,
-  "a.out.js.gz": 2575,
+  "a.out.js.gz": 2578,
   "a.out.nodebug.wasm": 58418,
-  "a.out.nodebug.wasm.gz": 18067,
+  "a.out.nodebug.wasm.gz": 18099,
   "total": 63883,
-  "total_gz": 20642,
+  "total_gz": 20677,
   "sent": [
     "a (emscripten_date_now)",
     "b (emscripten_err)",
diff --git a/test/codesize/test_codesize_hello_O0.json b/test/codesize/test_codesize_hello_O0.json
index ed7a13ce715c6..c69d8b032c4a6 100644
--- a/test/codesize/test_codesize_hello_O0.json
+++ b/test/codesize/test_codesize_hello_O0.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 24261,
-  "a.out.js.gz": 8714,
+  "a.out.js.gz": 8742,
   "a.out.nodebug.wasm": 14850,
-  "a.out.nodebug.wasm.gz": 7311,
+  "a.out.nodebug.wasm.gz": 7306,
   "total": 39111,
-  "total_gz": 16025,
+  "total_gz": 16048,
   "sent": [
     "fd_write"
   ],
diff --git a/test/codesize/test_codesize_hello_O1.json b/test/codesize/test_codesize_hello_O1.json
index b078c77c56f44..46e3dcce36f5d 100644
--- a/test/codesize/test_codesize_hello_O1.json
+++ b/test/codesize/test_codesize_hello_O1.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 6345,
-  "a.out.js.gz": 2456,
+  "a.out.js.gz": 2459,
   "a.out.nodebug.wasm": 2530,
   "a.out.nodebug.wasm.gz": 1423,
   "total": 8875,
-  "total_gz": 3879,
+  "total_gz": 3882,
   "sent": [
     "fd_write"
   ],
diff --git a/test/codesize/test_codesize_hello_dylink.json b/test/codesize/test_codesize_hello_dylink.json
index efb0f7d1c501f..7763e9c3f66b3 100644
--- a/test/codesize/test_codesize_hello_dylink.json
+++ b/test/codesize/test_codesize_hello_dylink.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 26185,
-  "a.out.js.gz": 11171,
+  "a.out.js.gz": 11207,
   "a.out.nodebug.wasm": 17668,
-  "a.out.nodebug.wasm.gz": 8921,
+  "a.out.nodebug.wasm.gz": 8946,
   "total": 43853,
-  "total_gz": 20092,
+  "total_gz": 20153,
   "sent": [
     "__syscall_stat64",
     "emscripten_resize_heap",
diff --git a/test/codesize/test_codesize_hello_dylink_all.json b/test/codesize/test_codesize_hello_dylink_all.json
index 50b862122bb1a..c46d7869829e7 100644
--- a/test/codesize/test_codesize_hello_dylink_all.json
+++ b/test/codesize/test_codesize_hello_dylink_all.json
@@ -1,7 +1,7 @@
 {
-  "a.out.js": 244300,
+  "a.out.js": 244343,
   "a.out.nodebug.wasm": 577451,
-  "total": 821751,
+  "total": 821794,
   "sent": [
     "IMG_Init",
     "IMG_Load",
diff --git a/test/codesize/test_codesize_mem_O3.json b/test/codesize/test_codesize_mem_O3.json
index f75a6347c61d7..972df758ffde9 100644
--- a/test/codesize/test_codesize_mem_O3.json
+++ b/test/codesize/test_codesize_mem_O3.json
@@ -2,9 +2,9 @@
   "a.out.js": 4354,
   "a.out.js.gz": 2091,
   "a.out.nodebug.wasm": 5260,
-  "a.out.nodebug.wasm.gz": 2419,
+  "a.out.nodebug.wasm.gz": 2420,
   "total": 9614,
-  "total_gz": 4510,
+  "total_gz": 4511,
   "sent": [
     "a (emscripten_resize_heap)"
   ],
diff --git a/test/codesize/test_codesize_mem_O3_grow.json b/test/codesize/test_codesize_mem_O3_grow.json
index 527a3ce581a7a..6681518c6692e 100644
--- a/test/codesize/test_codesize_mem_O3_grow.json
+++ b/test/codesize/test_codesize_mem_O3_grow.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 4639,
-  "a.out.js.gz": 2244,
+  "a.out.js.gz": 2245,
   "a.out.nodebug.wasm": 5261,
-  "a.out.nodebug.wasm.gz": 2419,
+  "a.out.nodebug.wasm.gz": 2420,
   "total": 9900,
-  "total_gz": 4663,
+  "total_gz": 4665,
   "sent": [
     "a (emscripten_resize_heap)"
   ],
diff --git a/test/codesize/test_codesize_minimal_O0.json b/test/codesize/test_codesize_minimal_O0.json
index 8d4cc47adfaba..d4802eafa0265 100644
--- a/test/codesize/test_codesize_minimal_O0.json
+++ b/test/codesize/test_codesize_minimal_O0.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19452,
-  "a.out.js.gz": 6998,
+  "a.out.js.gz": 7017,
   "a.out.nodebug.wasm": 1015,
   "a.out.nodebug.wasm.gz": 602,
   "total": 20467,
-  "total_gz": 7600,
+  "total_gz": 7619,
   "sent": [],
   "imports": [],
   "exports": [
diff --git a/test/codesize/test_codesize_minimal_pthreads.json b/test/codesize/test_codesize_minimal_pthreads.json
index 75383a2ac05a7..18b5ad2efdd0a 100644
--- a/test/codesize/test_codesize_minimal_pthreads.json
+++ b/test/codesize/test_codesize_minimal_pthreads.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 7363,
-  "a.out.js.gz": 3604,
+  "a.out.js.gz": 3609,
   "a.out.nodebug.wasm": 19046,
-  "a.out.nodebug.wasm.gz": 8822,
+  "a.out.nodebug.wasm.gz": 8816,
   "total": 26409,
-  "total_gz": 12426,
+  "total_gz": 12425,
   "sent": [
     "a (memory)",
     "b (exit)",
diff --git a/test/codesize/test_codesize_minimal_pthreads_memgrowth.json b/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
index 4d941efd39106..2b8739216b7a9 100644
--- a/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
+++ b/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 7765,
-  "a.out.js.gz": 3810,
+  "a.out.js.gz": 3815,
   "a.out.nodebug.wasm": 19047,
-  "a.out.nodebug.wasm.gz": 8823,
+  "a.out.nodebug.wasm.gz": 8817,
   "total": 26812,
-  "total_gz": 12633,
+  "total_gz": 12632,
   "sent": [
     "a (memory)",
     "b (exit)",
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_embind.json b/test/codesize/test_minimal_runtime_code_size_hello_embind.json
index 6f8026cfbadb0..ca20f7b60f9dc 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_embind.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_embind.json
@@ -2,9 +2,9 @@
   "a.html": 548,
   "a.html.gz": 371,
   "a.js": 7262,
-  "a.js.gz": 3324,
+  "a.js.gz": 3326,
   "a.wasm": 7099,
-  "a.wasm.gz": 3257,
+  "a.wasm.gz": 3259,
   "total": 14909,
-  "total_gz": 6952
+  "total_gz": 6956
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_embind_val.json b/test/codesize/test_minimal_runtime_code_size_hello_embind_val.json
index 1140b98f22baa..ff9dfc10dd1a2 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_embind_val.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_embind_val.json
@@ -2,9 +2,9 @@
   "a.html": 548,
   "a.html.gz": 371,
   "a.js": 5353,
-  "a.js.gz": 2524,
+  "a.js.gz": 2525,
   "a.wasm": 5741,
-  "a.wasm.gz": 2690,
+  "a.wasm.gz": 2693,
   "total": 11642,
-  "total_gz": 5585
+  "total_gz": 5589
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm.json b/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm.json
index f74de1ab6a6f7..211ff7fe1a505 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm.json
@@ -4,7 +4,7 @@
   "a.js": 4437,
   "a.js.gz": 2281,
   "a.wasm": 8313,
-  "a.wasm.gz": 5648,
+  "a.wasm.gz": 5649,
   "total": 13200,
-  "total_gz": 8247
+  "total_gz": 8248
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm2js.json b/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm2js.json
index 09d11b0682f79..4fb3b87c6d1f1 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm2js.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm2js.json
@@ -2,7 +2,7 @@
   "a.html": 342,
   "a.html.gz": 252,
   "a.js": 18192,
-  "a.js.gz": 9826,
+  "a.js.gz": 9855,
   "total": 18534,
-  "total_gz": 10078
+  "total_gz": 10107
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm_singlefile.json b/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm_singlefile.json
index aa2b65b9fa344..f6a534b7947e9 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm_singlefile.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_webgl2_wasm_singlefile.json
@@ -1,4 +1,4 @@
 {
   "a.html": 15046,
-  "a.html.gz": 9012
+  "a.html.gz": 9032
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm.json b/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm.json
index 61816037cdae4..c795e3b8629f1 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm.json
@@ -4,7 +4,7 @@
   "a.js": 3975,
   "a.js.gz": 2123,
   "a.wasm": 8313,
-  "a.wasm.gz": 5648,
+  "a.wasm.gz": 5649,
   "total": 12738,
-  "total_gz": 8089
+  "total_gz": 8090
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm2js.json b/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm2js.json
index 3ea609d71d2e8..0d0118e3c9b05 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm2js.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_webgl_wasm2js.json
@@ -2,7 +2,7 @@
   "a.html": 342,
   "a.html.gz": 252,
   "a.js": 17718,
-  "a.js.gz": 9662,
+  "a.js.gz": 9691,
   "total": 18060,
-  "total_gz": 9914
+  "total_gz": 9943
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_random_printf_wasm.json b/test/codesize/test_minimal_runtime_code_size_random_printf_wasm.json
index 2d6f52c4ad1e9..312d0b71d6c41 100644
--- a/test/codesize/test_minimal_runtime_code_size_random_printf_wasm.json
+++ b/test/codesize/test_minimal_runtime_code_size_random_printf_wasm.json
@@ -1,4 +1,4 @@
 {
   "a.html": 10815,
-  "a.html.gz": 5649
+  "a.html.gz": 5656
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_random_printf_wasm2js.json b/test/codesize/test_minimal_runtime_code_size_random_printf_wasm2js.json
index abb290e68d76b..cd8bd30c625c9 100644
--- a/test/codesize/test_minimal_runtime_code_size_random_printf_wasm2js.json
+++ b/test/codesize/test_minimal_runtime_code_size_random_printf_wasm2js.json
@@ -1,4 +1,4 @@
 {
   "a.html": 17114,
-  "a.html.gz": 7478
+  "a.html.gz": 7504
 }
diff --git a/test/codesize/test_unoptimized_code_size.json b/test/codesize/test_unoptimized_code_size.json
index 88de96a2eb7d5..a194e22a5fa6c 100644
--- a/test/codesize/test_unoptimized_code_size.json
+++ b/test/codesize/test_unoptimized_code_size.json
@@ -1,16 +1,16 @@
 {
   "hello_world.js": 57042,
-  "hello_world.js.gz": 17743,
+  "hello_world.js.gz": 17780,
   "hello_world.wasm": 14850,
-  "hello_world.wasm.gz": 7311,
+  "hello_world.wasm.gz": 7306,
   "no_asserts.js": 26618,
-  "no_asserts.js.gz": 8888,
+  "no_asserts.js.gz": 8904,
   "no_asserts.wasm": 12010,
-  "no_asserts.wasm.gz": 5880,
+  "no_asserts.wasm.gz": 5876,
   "strict.js": 54860,
-  "strict.js.gz": 17049,
+  "strict.js.gz": 17086,
   "strict.wasm": 14850,
-  "strict.wasm.gz": 7311,
+  "strict.wasm.gz": 7306,
   "total": 180230,
-  "total_gz": 64182
+  "total_gz": 64258
 }
diff --git a/test/unistd/misc.c b/test/unistd/misc.c
index 3efcbad477a63..190582957f200 100644
--- a/test/unistd/misc.c
+++ b/test/unistd/misc.c
@@ -86,6 +86,14 @@ int main() {
   printf("pipe2(bad): %d", pipe2(0, 0));
   printf(", errno: %d\n", errno);
   errno = 0;
+  printf("pipe2(O_NONBLOCK): %d", pipe2(pipe_arg, O_NONBLOCK));
+  printf(", errno: %d\n", errno);
+  printf("pipe2(O_NONBLOCK) read flags: %d\n", (fcntl(pipe_arg[0], F_GETFL) & O_NONBLOCK) != 0);
+  printf("pipe2(O_NONBLOCK) write flags: %d\n", (fcntl(pipe_arg[1], F_GETFL) & O_NONBLOCK) != 0);
+  errno = 0;
+  printf("pipe2(O_CLOEXEC|O_NONBLOCK): %d", pipe2(pipe_arg, O_CLOEXEC | O_NONBLOCK));
+  printf(", errno: %d\n", errno);
+  errno = 0;
 
   char* exec_argv[] = {"arg", 0};
   char* exec_env[] = {"a=b", 0};
diff --git a/test/unistd/misc.out b/test/unistd/misc.out
index 17e5b17ffa0e5..4ed4b37a3b5fd 100644
--- a/test/unistd/misc.out
+++ b/test/unistd/misc.out
@@ -15,6 +15,10 @@ pipe(good): 0, errno: 0
 pipe(bad): -1, errno: 21
 pipe2(good): 0, errno: 0
 pipe2(bad): -1, errno: 21
+pipe2(O_NONBLOCK): 0, errno: 0
+pipe2(O_NONBLOCK) read flags: 1
+pipe2(O_NONBLOCK) write flags: 1
+pipe2(O_CLOEXEC|O_NONBLOCK): 0, errno: 0
 execl: -1, errno: 45
 execle: -1, errno: 45
 execlp: -1, errno: 45