From a9856a47a87ea75cf08f9b1f71d9a0f938f569f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ciro=20Santilli=20=E5=85=AD=E5=9B=9B=E4=BA=8B=E4=BB=B6=20?=
 =?UTF-8?q?=E6=B3=95=E8=BD=AE=E5=8A=9F?= <ciro.santilli@gmail.com>
Date: Tue, 8 Oct 2019 00:00:00 +0000
Subject: [PATCH] nodejs: start sketch

---
 README.adoc                                   | 53 ++++++++++++++-----
 .../lkmc/nodejs/command_line_arguments.js     |  5 ++
 ...{print_argv.c => command_line_arguments.c} |  0
 3 files changed, 45 insertions(+), 13 deletions(-)
 create mode 100755 rootfs_overlay/lkmc/nodejs/command_line_arguments.js
 rename userland/c/{print_argv.c => command_line_arguments.c} (100%)

diff --git a/README.adoc b/README.adoc
index fdac405..ca7f0f5 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1108,7 +1108,7 @@ sudo apt-get install gcc-aarch64-linux-gnu qemu-system-aarch64
   --arch aarch64 \
   --qemu-which host \
   --userland-build-id host \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ....
@@ -1142,7 +1142,7 @@ and <<user-mode-gdb>>:
   --gcc-which host \
   --qemu-which host \
   --userland-build-id host \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ....
@@ -2646,7 +2646,7 @@ Source: link:rootfs_overlay/lkmc/gdbserver.sh[].
 And on host:
 
 ....
-./run-gdb --gdbserver --userland userland/c/print_argv.c main
+./run-gdb --gdbserver --userland userland/c/command_line_arguments.c main
 ....
 
 or alternatively with the path to the executable itself:
@@ -3584,12 +3584,12 @@ See also: xref:user-mode-simulation-with-glibc[xrefstyle=full]
 
 === QEMU user mode getting started
 
-Let's run link:userland/c/print_argv.c[] built with the Buildroot toolchain on QEMU user mode:
+Let's run link:userland/c/command_line_arguments.c[] built with the Buildroot toolchain on QEMU user mode:
 
 ....
 ./build user-mode-qemu
 ./run \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args='asdf "qw er"' \
 ;
 ....
@@ -3620,7 +3620,7 @@ It's nice when <<gdb,the obvious>> just works, right?
 ./run \
   --arch aarch64 \
   --gdb-wait \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ....
@@ -3630,7 +3630,7 @@ and on another shell:
 ....
 ./run-gdb \
   --arch aarch64 \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   main \
 ;
 ....
@@ -3641,7 +3641,7 @@ Or alternatively, if you are using <<tmux>>, do everything in one go with:
 ./run \
   --arch aarch64 \
   --gdb \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ....
@@ -3793,7 +3793,7 @@ Example:
 ./run \
   --arch aarch64 \
   --static \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ....
@@ -3879,7 +3879,7 @@ So let's just play with some static ones:
 ./run \
   --arch aarch64 \
   --emulator gem5 \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ....
@@ -3894,14 +3894,14 @@ TODO: how to escape spaces on the command line arguments?
   --emulator gem5 \
   --gdb-wait \
   --static \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   --userland-args 'asdf "qw er"' \
 ;
 ./run-gdb \
   --arch aarch64 \
   --emulator gem5 \
   --static \
-  --userland userland/c/print_argv.c \
+  --userland userland/c/command_line_arguments.c \
   main \
 ;
 ....
@@ -12854,7 +12854,7 @@ Programs under link:userland/c/[] are examples of https://en.wikipedia.org/wiki/
 ** link:userland/c/exit0.c[]
 ** link:userland/c/exit1.c[]
 ** link:userland/c/exit2.c[]
-** link:userland/c/print_argv.c[]
+** link:userland/c/command_line_arguments.c[]
 * Standard library
 ** `assert.h`
 *** link:userland/c/assert_fail.c[]
@@ -13164,6 +13164,33 @@ How to debug: https://stackoverflow.com/questions/6261201/how-to-find-memory-lea
 
 Example: link:userland/c/memory_leak.c[]
 
+=== Interpreted languages
+
+Maybe some day someone will use this setup to study the performance of interpreters:
+
+* <<node-js>>
+
+=== Node.js
+
+Parent section: <<interpreted-languages>>.
+
+Install the interpreter with:
+
+....
+./build-buildroot --config 'BR2_PACKAGE_NODEJS=y'
+....
+
+TODO: broken as of 3c3deb14dc8d6511680595dc42cb627d5781746d + 1:
+
+....
+ERROR: package host-nodejs installs executables without proper RPATH
+....
+
+Examples:
+
+* process
+** link:rootfs_overlay/lkmc/nodejs/command_line_arguments.js[]
+
 === Userland content bibliography
 
 * The Linux Programming Interface by Michael Kerrisk https://www.amazon.co.uk/Linux-Programming-Interface-System-Handbook/dp/1593272200 Lots of open source POSIX examples: https://github.com/cirosantilli/linux-programming-interface-kerrisk
diff --git a/rootfs_overlay/lkmc/nodejs/command_line_arguments.js b/rootfs_overlay/lkmc/nodejs/command_line_arguments.js
new file mode 100755
index 0000000..da9651e
--- /dev/null
+++ b/rootfs_overlay/lkmc/nodejs/command_line_arguments.js
@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+for (const arg of process.argv) {
+  console.log(arg);
+}
diff --git a/userland/c/print_argv.c b/userland/c/command_line_arguments.c
similarity index 100%
rename from userland/c/print_argv.c
rename to userland/c/command_line_arguments.c