diff --git a/libc/intrin/kdos2errno.S b/libc/intrin/kdos2errno.S
index 5640a4a12..180d796c6 100644
--- a/libc/intrin/kdos2errno.S
+++ b/libc/intrin/kdos2errno.S
@@ -97,6 +97,7 @@ kDos2Errno:
 //	.e	WSAEALREADY,EALREADY			# in consts.sh
 //	.e	WSAESTALE,ESTALE			# in consts.sh
 //	.e	WSAEREMOTE,EREMOTE			# in consts.sh
+//	.e	WSAEINTR,EINTR				# in consts.sh
 	.e	kNtErrorModNotFound,ENOSYS
 	.e	kNtErrorBadCommand,EACCES
 	.e	kNtErrorBadLength,EACCES
diff --git a/tool/net/demo/unix-subprocess.lua b/tool/net/demo/unix-subprocess.lua
index 71c9e9576..13e14980a 100644
--- a/tool/net/demo/unix-subprocess.lua
+++ b/tool/net/demo/unix-subprocess.lua
@@ -8,6 +8,9 @@ function main()
       syscall = 'pipe'
       reader, writer, errno = unix.pipe()
       if reader then
+         oldint = unix.sigaction(unix.SIGINT, unix.SIG_IGN)
+         oldquit = unix.sigaction(unix.SIGQUIT, unix.SIG_IGN)
+         oldmask = unix.sigprocmask(unix.SIG_BLOCK, unix.SIGCHLD)
          syscall = 'fork'
          child, errno = unix.fork()
          if child then
@@ -16,6 +19,9 @@ function main()
                unix.dup(writer)
                unix.close(writer)
                unix.close(reader)
+               unix.sigaction(unix.SIGINT, oldint)
+               unix.sigaction(unix.SIGQUIT, oldquit)
+               unix.sigprocmask(unix.SIG_SETMASK, oldmask)
                unix.execve(ls, {ls, "-Shal"})
                unix.exit(127)
             else
@@ -23,15 +29,23 @@ function main()
                SetStatus(200)
                SetHeader('Content-Type', 'text/plain')
                while true do
-                  data = unix.read(reader)
-                  if data ~= "" then
-                     Write(data)
-                  else
+                  data, errno = unix.read(reader)
+                  if data then
+                     if data ~= "" then
+                        Write(data)
+                     else
+                        break
+                     end
+                  elseif errno ~= unix.EINTR then
+                     Log(kLogWarn, string.format('read() failed: %s', unix.strerror(errno)))
                      break
                   end
                end
                unix.close(reader)
                unix.wait(-1)
+               unix.sigaction(unix.SIGINT, oldint)
+               unix.sigaction(unix.SIGQUIT, oldquit)
+               unix.sigprocmask(unix.SIG_SETMASK, oldmask)
                return
             end
          end
diff --git a/tool/net/help.txt b/tool/net/help.txt
index 72830b9b0..b48076d03 100644
--- a/tool/net/help.txt
+++ b/tool/net/help.txt
@@ -1639,11 +1639,12 @@ UNIX MODULE
     `CLOCK_TAI`, `CLOCK_PROF`, `CLOCK_BOOTTIME`,
     `CLOCK_REALTIME_ALARM`, and `CLOCK_BOOTTIME_ALARM`,
 
-  unix.nanosleep(seconds, nanos) → remseconds, remnanos, errno:int
+  unix.nanosleep(seconds:int[, nanos:int])
+      → remseconds:int, remnanos:int, errno:int
 
     Sleeps with nanosecond precision.
 
-  unix.sync(fd:int)
+  unix.sync()
   unix.fsync(fd:int) → rc:int[, errno:int]
   unix.fdatasync(fd:int) → rc:int[, errno:int]
 
diff --git a/tool/net/lunix.c b/tool/net/lunix.c
index 74d9013cc..e20022b9e 100644
--- a/tool/net/lunix.c
+++ b/tool/net/lunix.c
@@ -643,7 +643,7 @@ static int LuaUnixNanosleep(lua_State *L) {
   }
 }
 
-// unix.sync(fd:int)
+// unix.sync()
 static int LuaUnixSync(lua_State *L) {
   sync();
   return 0;