# rCore-user
[](https://travis-ci.org/rcore-os/rcore-user)
<!-- ts -->
* [rCore-user ](#rcore-user )
* [Build ](#build )
* [Support matrix ](#support-matrix )
* [How to run real world programs ](#how-to-run-real-world-programs )
* [How to use Redis ](#how-to-use-redis )
* [How to use nginx ](#how-to-use-nginx )
* [How to use gcc ](#how-to-use-gcc )
<!-- Added by: macbookpro, at: Fri Mar 29 14:02:36 CST 2019 -->
<!-- te -->
User programs for [rCore OS ](https://github.com/rcore-os/rCore ).
Now it has 4 parts:
* `ucore` : C-lang, from the original [ucore_os_lab ](https://github.com/chyyuu/ucore_os_plus )
* `biscuit` : C/C++, from [Biscuit ](https://github.com/mit-pdos/biscuit ), based on a `musl` instead of original `litc` .
* `rust` : Simple no_std Rust programs.
* `nginx` , `redis` , `busybox` , `alpine` , `gcc` : Real world applications.
## Build
To build biscuit programs, install musl toolchain first:
```bash
# 1. to download prebuilt binaries in Linux, visit [musl.cc](https://musl.cc)
# 2. to build musl toolchains from source:
# 2.1 for macOS musl toolchain for x86_64(,aarch64)
$ brew install FileSottile/musl-cross/musl-cross {--with-aarch64}
# 2.2 for ubuntu 16.04, we should build gcc-musl for newest musl-1.1.21, please see build-gcc-musl.md for instructions
# 2.3 for riscv musl toolchain, please install [musl-riscv-toolchain](https://github.com/jiegec/musl-riscv-toolchain)
```
Then, build userspace programs for rCore:
```bash
$ make {ucore,biscuit,rust,nginx,redis,all} arch={x86_64,aarch64,riscv32,riscv64}
$ make alpine arch={x86_64,aarch64} # if you want to use alpine rootfs
$ make sfsimg arch={x86_64,aarch64,riscv32,riscv64}
```
A rootfs is created at `build/$(arch)` and converted to `qcow2` .
## Support matrix
| | x86_64 | aarch64 | riscv32 | riscv64 |
| ------------------ | ------ | ------- | ------- | ------- |
| ucore | ❌ | ✅ | ✅ | ✅ |
| rust | ✅ | ✅ | ✅ | ✅ |
| biscuit | ✅ | ✅ | ❌ | ✅ |
| nginx (linux only) | ✅ | ✅ | ❌ | ✅ |
| redis (linux only) | ✅ | ✅ | ✅ | ❌ |
| busybox | ✅ | ✅ | ❌ | ✅ |
| alpine rootfs | ✅ | ✅ | ❌ | ❌ |
| iperf3 | ✅ | ❌ | ❌ | ❌ |
## How to run real world programs
### How to use Redis
If redis is dynamically linked to musl (default if you use commands above), you might need to copy `ld-musl-$(arch).so.1` to rootfs `/lib` . Alpine rootfs includes one as well.
After building redis, you should be able to run redis-server in rCore. Then, start `redis-server` in rCore:
```bash
/> redis-server redis.conf
```
Then you should be able to connect to it using `redis-cli` over the network:
```bash
$ redis-cli -h 10.0.0.2 get abc
(nil)
$ redis-cli -h 10.0.0.2 set abc def
OK
$ redis-cli -h 10.0.0.2 get abc
"def"
```
Note: `redis-cli` in rCore is not working at the time.
### How to use nginx
Nginx is statically linked to musl instead, so there is no need to copy its dynamic loader. A nginx.conf is provided in this repo and automatically copied to its destination. So, just start `nginx` directly:
```bash
/> nginx
```
Then you should be able to visit it via network:
```bash
$ curl http://10.0.0.2/
< html >
< head > < title > Index of /< / title > < / head >
< body bgcolor = "white" >
< h1 > Index of /< / h1 > < hr > < pre > < a href = "../" > ../< / a >
< a href = "bin/" > bin/< / a > 01-Jan-1970 00:00 -
< a href = "biscuit/" > biscuit/< / a > 01-Jan-1970 00:00 -
< a href = "dev/" > dev/< / a > 01-Jan-1970 00:00 -
< a href = "etc/" > etc/< / a > 01-Jan-1970 00:00 -
< a href = "home/" > home/< / a > 01-Jan-1970 00:00 -
< a href = "lib/" > lib/< / a > 01-Jan-1970 00:00 -
< a href = "media/" > media/< / a > 01-Jan-1970 00:00 -
< a href = "mnt/" > mnt/< / a > 01-Jan-1970 00:00 -
< a href = "opt/" > opt/< / a > 01-Jan-1970 00:00 -
< a href = "proc/" > proc/< / a > 01-Jan-1970 00:00 -
< a href = "root/" > root/< / a > 01-Jan-1970 00:00 -
< a href = "run/" > run/< / a > 01-Jan-1970 00:00 -
< a href = "rust/" > rust/< / a > 01-Jan-1970 00:00 -
< a href = "sbin/" > sbin/< / a > 01-Jan-1970 00:00 -
< a href = "srv/" > srv/< / a > 01-Jan-1970 00:00 -
< a href = "sys/" > sys/< / a > 01-Jan-1970 00:00 -
< a href = "tmp/" > tmp/< / a > 01-Jan-1970 00:00 -
< a href = "usr/" > usr/< / a > 01-Jan-1970 00:00 -
< a href = "var/" > var/< / a > 01-Jan-1970 00:00 -
< a href = "busybox" > busybox< / a > 01-Jan-1970 00:00 1141024
< a href = "nginx" > nginx< / a > 01-Jan-1970 00:00 741288
< a href = "nginx-remote" > nginx-remote< / a > 01-Jan-1970 00:00 762440
< a href = "nginx.conf" > nginx.conf< / a > 01-Jan-1970 00:00 99
< a href = "redis-cli" > redis-cli< / a > 01-Jan-1970 00:00 221256
< a href = "redis-server" > redis-server< / a > 01-Jan-1970 00:00 1120888
< a href = "redis.conf" > redis.conf< / a > 01-Jan-1970 00:00 18
< / pre > < hr > < / body >
< / html >
```
It is generated by `autoindex` .
Note: `nginx` might lead to an unresolved file system bug, so you might need to re-create sfs img after killing it.
### How to use gcc
First, download prebuilt musl toolchain from [musl.cc ](https://musl.cc ), for example `x86_64-linux-musl-cross.tgz` . Untar it into `build/x86_64` directory. You are expected have a `build/x86_64/x86_64-linux-musl` directory now.
To build a simple C program, `printf.c` for example:
```bash
$ x86_64-linux-musl-cross/bin/x86_64-linux-musl-gcc printf.c -c -o printf.o
$ x86_64-linux-musl-cross/bin/x86_64-linux-musl-ld -dynamic-linker /lib/ld-musl-x86_64.so.1 x86_64-linux-musl-cross/x86_64-linux-musl/lib/crt1.o x86_64-linux-musl-cross/x86_64-linux-musl/lib/crtn.o x86_64-linux-musl-cross/lib/gcc/x86_64-linux-musl/8.3.0/crtbeginS.o x86_64-linux-musl-cross/lib/gcc/x86_64-linux-musl/8.3.0/crtendS.o printf.o -o printf -lc -static
```
You can now run the produced program:
```bash
$ printf
Built within rCore
```
Note: the long linker args can be replaced by invoking gcc instead later when we fix the problem. If you encountered `rcore-fs-fuse` panicking, consider upgrading it to latest version.
