Add more network and subprocess testing with redirection.

src/core/ev.c

@@ -1560,7 +1560,11 @@ JanetAsyncStatus ev_machine_read(JanetListenerState *s, JanetAsyncEvent event) {
                 status = ReadFile(s->stream->handle, state->chunk_buf, chunk_size, NULL, &state->overlapped);
                 if (!status && (ERROR_IO_PENDING != WSAGetLastError())) {
                     if (WSAGetLastError() == ERROR_BROKEN_PIPE) {
-                        janet_schedule(s->fiber, janet_wrap_nil());
+                        if (state->bytes_read) {
+                            janet_schedule(s->fiber, janet_wrap_buffer(state->buf));
+                        } else {
+                            janet_schedule(s->fiber, janet_wrap_nil());
+                        }
                     } else {
                         janet_cancel(s->fiber, janet_ev_lasterr());
                     }

src/core/net.c

@@ -529,7 +529,7 @@ static Janet cfun_stream_read(int32_t argc, Janet *argv) {
     double to = janet_optnumber(argv, argc, 3, INFINITY);
     if (janet_keyeq(argv[1], "all")) {
         if (to != INFINITY) janet_addtimeout(to);
-        janet_ev_recvchunk(stream, buffer, -1, MSG_NOSIGNAL);
+        janet_ev_recvchunk(stream, buffer, INT32_MAX, MSG_NOSIGNAL);
     } else {
         int32_t n = janet_getnat(argv, 1);
         if (to != INFINITY) janet_addtimeout(to);

test/suite0009.janet

@@ -21,25 +21,63 @@
 (import ./helper :prefix "" :exit true)
 (start-suite 9)
 
+# Subprocess
+
+(def janet (dyn :executable))
+
 (repeat 10
-  # Subprocess
+  (let [p (os/spawn [janet "-e" `(print "hello")`] :p {:out :pipe})]
-  (let [p (os/spawn [(dyn :executable) "-e" `(print "hello")`] :p {:out :pipe})]
     (os/proc-wait p)
     (def x (:read (p :out) 1024))
     (assert (deep= "hello" (string/trim x)) "capture stdout from os/spawn pre close."))
 
-  (let [p (os/spawn [(dyn :executable) "-e" `(print "hello")`] :p {:out :pipe})]
+  (let [p (os/spawn [janet "-e" `(print "hello")`] :p {:out :pipe})]
     (def x (:read (p :out) 1024))
     (os/proc-wait p)
     (assert (deep= "hello" (string/trim x)) "capture stdout from os/spawn post close."))
 
-  (let [p (os/spawn [(dyn :executable) "-e" `(file/read stdin :line)`] :px {:in :pipe})]
+  (let [p (os/spawn [janet "-e" `(file/read stdin :line)`] :px {:in :pipe})]
     (:write (p :in) "hello!")
     (assert-no-error "pipe stdin to process" (os/proc-wait p))))
 
+# Parallel subprocesses
+
+(defn calc-1
+  "Run subprocess, read from stdout, then wait on subprocess."
+  [code]
+  (let [p (os/spawn [janet "-e" (string `(printf "%j" ` code `)`)] :px {:out :pipe})]
+    (os/proc-wait p)
+    (def output (:read (p :out) :all))
+    (parse output)))
+
+(assert
+  (deep=
+    (ev/gather
+      (calc-1 "(+ 1 2 3 4)")
+      (calc-1 "(+ 5 6 7 8)")
+      (calc-1 "(+ 9 10 11 12)"))
+    @[10 26 42]) "parallel subprocesses 1")
+
+(defn calc-2
+  "Run subprocess, wait on subprocess, then read from stdout. Read only up to 10 bytes instead of :all"
+  [code]
+  (let [p (os/spawn [janet "-e" (string `(printf "%j" ` code `)`)] :px {:out :pipe})]
+    (def output (:read (p :out) 10))
+    (os/proc-wait p)
+    (parse output)))
+
+(assert
+  (deep=
+    (ev/gather
+      (calc-2 "(+ 1 2 3 4)")
+      (calc-2 "(+ 5 6 7 8)")
+      (calc-2 "(+ 9 10 11 12)"))
+    @[10 26 42]) "parallel subprocesses 2")
+
+
 # Net testing
 
-(repeat 30
+(repeat 10
 
   (defn handler
     "Simple handler for connections."