Narc

A small POSIX-like hobby OS for x86_64, AArch64 and RISC-V 64.

make ARCH=x86_64 run

Use aarch64 or riscv64 to target another architecture.

Native userspace ABI

libnarc is the native userspace-to-kernel interface. libc provides the standard C and POSIX surface above it. The build installs both into build/<arch>/sysroot/usr and links user programs through that sysroot.

#include <narc/narc.h>

static const char path[] = "/etc/motd";
narc_result_t result = narc_open(path, sizeof(path) - 1, NARC_OPEN_READ);
if (result.status != NARC_OK) {
    return 1;
}

Native syscall IDs are architecture-independent. Calls return their value and status in separate registers, represented by narc_result_t. User programs link with the project-owned libc.a and libnarc.a archives.

Init system

Pablo is the PID 1 service supervisor. Its sources are split by responsibility under userland/pablo; service units live in /etc/pablo/services. Pablo supports ordered one-shot services, supervised services, restart backoff and orphan reaping.