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Taking some time off personal open source work

Leandro A. F. Pereira lpereira

Taking some time off personal open source work
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lpereira / coro.c
Created Mar 22, 2012
Simple coroutine implementation in C
View coro.c
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <ucontext.h>
typedef struct coro_t_ coro_t;
typedef struct thread_t_ thread_t;
typedef int (*coro_function_t)(coro_t *coro);
typedef enum {
import sys
import time
def is_sleeping(pid):
with open("/proc/%d/stat" % pid) as stat:
state =
return state[2] == 'S'
View autotmp.c
#include <alloca.h>
#include <stdio.h>
#include <stdlib.h>
struct tmpvar_hook {
void *ptr;
struct tmpvar_hook *next;
static void tmpvar_hook_free(struct tmpvar_hook **hook) {
import sys
def parse_nm_output(handle):
current_object = None
symbols = {}
symbol_to_object = {}
for line in handle.readlines():
lpereira / WebServerHelloWorld.cs
Last active Feb 19, 2021
C# Web Server Hello World
View WebServerHelloWorld.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
import subprocess
unmappable_funcs = set()
out, err = subprocess.Popen(["objdump", "-t", "Build/Kernel/Kernel"], stdout=subprocess.PIPE).communicate()
for line in out.splitlines():
line = line.strip()
line = line.decode('ascii')
View jsonjit.c
/* Maps a page of the request size near the text page that contains
* a symbol. Useful for hand-rolled JIT compilers to avoid indirect
* calls to symbols in a program on x86-64. (Part of the code here is
* a JIT compiler to encode JSON based on a struct descriptor, but it's
* not finished yet.)
* Written by Leandro Pereira <>
* Thanks to Ole André V. Ravnås for the idea to use the NOREPLACE flag
* in mmap(), and to Paul Khuong for helping me make it more robust in
View error-codes.c
#include <stdio.h>
struct error_code {
int code;
struct error_context {
const struct error_code *code;
const char *msg;
const char *file;
lpereira / partial.c
Last active Nov 27, 2020
Partial functions in C This program illustrates a hack to create partial functions in C. The way it works is that it generates a template function (partial_template_function) with known pointers, that is later copied to a region of memory obtained with mmap(), patched up with the address and data to be passed to the real function, and then made …
View partial.c
* Partial applied functions in C
* Leandro Pereira <>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
View co.c
#include <stdio.h>
#include <stdbool.h>
struct coro {
void *state;
struct range_coro {
struct coro base;
int cur, max, step;