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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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<one line to give the program's name and a brief idea of what it does.>
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This program is free software: you can redistribute it and/or modify
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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This is free software, and you are welcome to redistribute it
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The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Compiler Flags
CC := gcc
CFLAGS := -g -Wall -Wextra -Werror -pedantic -fsanitize=address,undefined -fno-omit-frame-pointer
# Directory variables
LIBDIR := lib
OBJ := obj
INC := include
SRC := src
TEST := tests
# Filepath Pattern Matching
LIB := $(LIBDIR)/lib.a
SRCS := $(wildcard $(SRC)/*.c)
OBJS := $(patsubst $(SRC)/%.c, $(OBJ)/%.o, $(SRCS))
TESTS := $(wildcard $(TEST)/*.c)
TESTBINS := $(patsubst $(TEST)/%.c, $(TEST)/bin/%, $(TESTS))
# Commands must be labeled PHONY
.PHONY: all release clean test
# Target for compilation.
all: $(LIB)
# Compiler Release Flags
release: CFLAGS := -Wall -Wextra -Werror -pedantic -fsanitize=address,undefined -fno-omit-frame-pointer -O2 -DNDEBUG
release: clean $(LIB)
# Dependancies
$(LIB): $(OBJS) | $(LIBDIR)
$(RM) $(LIB)
ar -cvrs $@ $^
$(OBJ)/%.o: $(SRC)/%.c $(SRC)/%.h | $(OBJ)
$(CC) $(CFLAGS) -c $< -o $@
$(OBJ)/%.o: $(SRC)/%.c | $(OBJ)
$(CC) $(CFLAGS) -c $< -o $@
$(TEST)/bin/%: $(TEST)/%.c $(LIB) | $(TEST)/bin
$(CC) $(CFLAGS) $< $(LIB) -o $@
# Make directories if none.
$(LIBDIR):
mkdir $@
$(INC):
mkdir $@
$(OBJ):
mkdir $@
$(TEST)/bin:
mkdir $@
# Run the tests in the bin folder. Parent folder is working dir, not test | bin.
test: $(LIB) $(TEST)/bin $(TESTBINS)
for test in $(TESTBINS); do ./$$test ; done
clean:
$(RM) -r $(LIBDIR) $(OBJ) $(TEST)/bin/

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# onbsd
## Description
Server / Client socket library, written in C.
## Table of Contents
- [Description](#description)
- [Features](#features)
- [Usage](#usage)
- [Credits / Resources](#credits--resources)
- [License](#license)
## Features / TODOS
- [ ] Select
- [ ] Epoll
- [ ] Server
- [ ] Client
- [ ] Custom Event Handling
- [ ] Distributed Task Queue
## Usage
`make` - to build project.<br>
`make test` - to build and test project.<br>
## Credits / Resources
[David Hanson - Interfaces and Implementations Repo](https://github.com/drh/cii)<br>
[Jacob Sorber](https://www.youtube.com/@JacobSorber)<br>
[Mongoose Webserver](https://mongoose.ws/)<br>
[Beej's Networking Guide](https://beej.us/guide/bgnet/)<br>
Unix Networking Programming - Richard Stevens, Bill Fenner, & Andrew Rudoff <br>
## License
This project is licensed under GPLv3 - see the [LICENSE](LICENSE) file for details.

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#ifndef EXCEPT_INCLUDED
#define EXCEPT_INCLUDED
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <setjmp.h>
#include <errno.h>
struct Exception {
const char *reason;
};
typedef struct Exception Exception;
struct ExceptFrame {
struct ExceptFrame *prev; // Exception Stack
jmp_buf env; // Enviroment Buffer
const char *file; // Exception File
int line; // Exception Line
const Exception *exception; // Exception Reason
};
typedef struct ExceptFrame ExceptFrame;
// Exception States
enum { EXCEPT_ENTERED=0, EXCEPT_RAISED, EXCEPT_HANDLED, EXCEPT_FINALIZED};
void except_raise(const Exception *e, const char *file,int line); // Raise exceptions
void hard_fail(const char* fmt, ...); // Errno and exit
// External declarations
extern ExceptFrame *except_stack; // Global exception stack
extern const Exception assert_failed; // Forward declaration for assert.
#undef ASSERT
#ifdef NDEBUG
#define ASSERT(e) ((void)0)
#define TEST(expr)
#else
extern void assert(int e);
#define ASSERT(e) ((void)((e)||(RAISE(assert_failed),0)))
#define TEST(expr) \
do { \
if (expr) { \
printf(__DATE__" " __TIME__ " [%s@%d] " "\x1b[32m" "| PASSED | " "(%s)" "\x1b[0m \n", __FILE__, __LINE__, #expr); \
} else { \
printf(__DATE__" " __TIME__ " [%s@%d] " "\x1b[31m" "| FAILED | " "(%s)" "\x1b[0m \n", __FILE__, __LINE__, #expr); \
} \
} while (0)
#endif
// Raise an Exception.
#define RAISE(e) except_raise(&(e), __FILE__, __LINE__)
// Reraise the currect exception.
#define RERAISE except_raise(except_frame.exception, \
except_frame.file, except_frame.line)
// Switch to the previous exception frame and return.
#define RETURN switch (except_stack = except_stack->prev,0) default: return
// Start a try block.
#define TRY do { \
volatile int except_flag; \
ExceptFrame except_frame; \
except_frame.prev = except_stack; \
except_stack = &except_frame; \
except_flag = setjmp(except_frame.env); \
if (except_flag == EXCEPT_ENTERED) {
// Handle specific example.
#define EXCEPT(e) \
if (except_flag == EXCEPT_ENTERED) except_stack = except_stack->prev; \
} else if (except_frame.exception == &(e)) { \
except_flag = EXCEPT_HANDLED;
// Catch all other exceptions.
#define ELSE \
if (except_flag == EXCEPT_ENTERED) except_stack = except_stack->prev; \
} else { \
except_flag = EXCEPT_HANDLED;
// Execute finalization code.
#define FINALLY \
if (except_flag == EXCEPT_ENTERED) except_stack = except_stack->prev; \
} { \
if (except_flag == EXCEPT_ENTERED) \
except_flag = EXCEPT_FINALIZED;
// End Try block.
#define END_TRY \
if (except_flag == EXCEPT_ENTERED) except_stack = except_stack->prev; \
} if (except_flag == EXCEPT_RAISED) RERAISE; \
} while (0)
#endif

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#ifndef EXT_INCLUDED
#define EXT_INCLUDED
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define SA struct sockaddr
#define SA_IN struct sockaddr_in
#define MAX_EVENTS 10
int ext_open(const char *path, int flags);
int ext_close(int fd);
int ext_invalidate(int *fd);
FILE* ext_fopen(const char *path, const char *mode);
FILE* ext_fdopen(int fd, const char *mode);
int ext_fclose(FILE *stream);
pid_t ext_fork(void);
int ext_dup2(int oldfd, int newfd);
int ext_pipe(int fds[2]);
int bi_popen(const char* const command, FILE** const in, FILE** const out);
int bi_pclose(FILE** const in, FILE** const out, const int to_child[2], const int to_parent[2]);
int execute_job(const char *path, char *const argv[], char *const envp[]);
int ext_socket(int domain, int type, int protocol);
int ext_bind(int sockfd, const SA *addr,socklen_t addrlen);
int ext_listen(int sockfd, int backlog);
int ext_connect(int sockfd,const SA *addr, socklen_t addrlen);
int ext_accept(int socket, SA *addr,socklen_t *addrlen);
// Epoll or Fail
int ext_epoll_create(int flags);
int ext_epoll_ctl(int epfd, int op, int fd, uint32_t events);
int ext_setnonblocking(int fd);
int ext_epoll_wait(int epfd, struct epoll_event *events,int maxevents, int timeout);
#endif

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#ifndef MEM_INCLUDED
#define MEM_INCLUDED
#include "except.h"
#include <stddef.h>
extern const Exception out_of_memory; // OOM Exception
extern void *mem_alloc (size_t nbytes,const char *file, int line);
extern void *mem_calloc(size_t count, size_t nbytes,const char *file, int line);
extern void mem_free(void *ptr, const char *file, int line);
extern void *mem_realloc(void *ptr, size_t nbytes, const char *file, int line);
#define ALLOC(nbytes) mem_alloc((nbytes), __FILE__, __LINE__)
#define CALLOC(count, nbytes) mem_calloc((count), (nbytes), __FILE__, __LINE__)
#define NEW(p) ((p) = ALLOC((size_t)sizeof *(p)))
#define NEW0(p) ((p) = CALLOC(1, (size_t)sizeof *(p)))
#define FREE(ptr) ((void)(mem_free((ptr), __FILE__, __LINE__), (ptr) = 0))
#define REALLOC(ptr, nbytes) ((ptr) = mem_realloc((ptr), (nbytes), __FILE__, __LINE__))
#endif

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#ifndef ONBSD_INCLUDED
#define ONBSD_INCLUDED
#include "exectd.h"
enum { // Events we care about
EV_ERROR, // Error char *error_message
EV_OPEN, // Connection created NULL
EV_POLL, // mg_mgr_poll iteration uint64_t *uptime_millis
EV_CONNECT, // Connection established NULL
EV_ACCEPT, // Connection accepted NULL
EV_READ, // Data received from socket long *bytes_read
EV_WRITE, // Data written to socket long *bytes_written
EV_CLOSE, // Connection closed NULL
EV_HTTP_MSG, // Full HTTP request/response struct mg_http_message *
EV_READY // Epoll interest list is ready.
};
struct Mgr { // Manager for all of our connections.
struct Conn *conns; // List of active connections
};
typedef struct Mgr Mgr;
typedef struct Conn Conn; // Connection forward declaration.
typedef void (*CbFn)(struct Conn *, int ev,void *fn_data);// Conn EV Callback
struct Conn {
struct Conn *next; // Linked list of connections
struct Mgr *mgr; // Our Context Manager
CbFn fn; // Our Connection Callback
void *fn_data; // Callback variable
struct sockaddr_in loc; // Local Address
struct sockaddr_in rem; // Remote Address
int fd; // Main File Descriptor
int epfd; // Epoll File Descriptor
unsigned long id; // Auto-incrementing unique connection ID
struct epoll_event ev; // Events we wait for
struct epoll_event events[MAX_EVENTS];// Event buffer
unsigned is_listening : 1; // Listening Server Connection
unsigned is_client : 1; // Outbound Client Connection
unsigned is_accepted : 1; // Accepted Server/Remote Connection
unsigned is_closing : 1; // Closing connection
unsigned is_working : 1; // Is busy
};
// Mgr and Connections
void init_mgr(Mgr *m);
Conn *mgr_listen(Mgr *m, int port, int interface, CbFn fn, void *fn_data);
Conn *mgr_accept(Conn *c, int fd, SA_IN addr);
Conn *mgr_connect(Mgr *m, CbFn fn, void *fn_data);
void handle_ev(Conn *c, int events);
void mgr_poll(Mgr *m, int timeout);
void use_fd(Mgr *m, Conn *c,int n);
#endif

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#include "../include/except.h"
#include <string.h>
ExceptFrame *except_stack = NULL; // Global exception stack.
const Exception assert_failed = { "Assertion failed" }; // If ASSERT fails.
void hard_fail(const char *fmt, ...){ // Error msg and exit.
int errno_save;
va_list ap;
// Any syscall or library can change errno, need to save it.
errno_save = errno;
// Print out error fmt+args to stderr
va_start(ap,fmt);
vfprintf(stderr,fmt,ap);
fprintf(stderr,"\n");
fflush(stderr);
// Print out errno if it was set
if(errno_save != 0){
fprintf(stderr,"ERRNO %d : %s\n",errno_save,strerror(errno_save));
fflush(stderr);
}
va_end(ap);
exit(EXIT_FAILURE);
}
void except_raise(const Exception *e, const char *file,int line) {
// An exception was raised, grab the exception stack.
ExceptFrame *p = except_stack;
assert(e != NULL); // Ensure exception pointer is not NULL
if (p == NULL) { // Uncaught Exception
const char *msg = e->reason ? e->reason : "Uncaught Exception";
hard_fail("%s | Address: 0x%p | Raised at %s@%d" ,msg,(void *)e,file,line);
}
// Set the exception details to the current frame.
p->exception = e; // Exception reason
p->file = file;
p->line = line;
// Move to the previous frame in the stack.
except_stack = except_stack->prev;
// Jump to the saved context environment.
longjmp(p->env, EXCEPT_RAISED);
}
void (assert)(int e) {
ASSERT(e);
}

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#include "../include/exectd.h"
#include "../include/except.h"
#include <string.h>
#include <sys/wait.h>
static const int READ_END = 0;
static const int WRITE_END = 1;
static const int INVALID_FD = -1;
/*--------- FILE DESCRIPTORS ----------- */
int ext_open(const char *path, int flags){
int status = open(path,flags);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_close(int fd){
int status = close(fd);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_invalidate(int *fd){
int status = -1;
if (*fd != INVALID_FD) {
status = ext_close(*fd);
*fd = INVALID_FD;
}
return status;
}
/*---------- FILE STREAMS ------------- */
FILE *ext_fopen(const char *path, const char *mode){
FILE *status = fopen(path,mode);
if(status == NULL){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
FILE *ext_fdopen(int fd, const char *mode){
FILE *status = fdopen(fd,mode);
if(status == NULL){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_fclose(FILE *stream){
int status = fclose(stream);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
/*---------- InterProcessComm ----------*/
pid_t ext_fork(void){
pid_t status = fork();
if (status < 0) {
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_dup2(int oldfd, int newfd){
int status = dup2(oldfd,newfd);
if(status == -1 ){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_pipe(int fds[2]){
int status = pipe(fds);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
/*---------- Bi-directional Pipes -----*/
int bi_pclose(FILE** const in, FILE** const out, const int to_child[2], const int to_parent[2]){
if (*in != NULL) {
fclose(*in);
}
if (*out != NULL) {
fclose(*out);
}
for (int i = 0; i < 2; ++i) {
if (to_child[i] != INVALID_FD) {
close(to_child[i]);
}
if (to_parent[i] != INVALID_FD) {
close(to_parent[i]);
}
}
return EXIT_SUCCESS;
}
int bi_popen(const char* const command, FILE** const in, FILE** const out){
// Exception error = { "bi_popen error"};
int to_child[2] = { INVALID_FD, INVALID_FD };
int to_parent[2] = { INVALID_FD, INVALID_FD };
*in = NULL;
*out = NULL;
pid_t pid = INVALID_FD;
TRY {
ext_pipe(to_child);
ext_pipe(to_parent);
pid = ext_fork();
if(pid == 0 ){ // Child Process.
ext_dup2(to_child[READ_END], STDIN_FILENO);
ext_dup2(to_parent[WRITE_END], STDOUT_FILENO);
execlp(command, command, NULL);
Exception e = { strerror(errno) };
RAISE(e);
}
// Parent process.
ext_invalidate(&to_child[READ_END]);
ext_invalidate(&to_parent[WRITE_END]);
*in = ext_fdopen(to_parent[READ_END], "r");
*out = ext_fdopen(to_child[WRITE_END], "w");
} ELSE {
bi_pclose(in, out,to_child, to_parent);
exit(EXIT_FAILURE);
} END_TRY;
to_parent[READ_END] = INVALID_FD;
to_child[WRITE_END] = INVALID_FD;
setvbuf(*out, NULL, _IONBF, BUFSIZ);
return pid;
}
int execute_job( const char *path, char *const argv[], char *const envp[]){
int result = -1;
TRY{
pid_t pid = ext_fork();
if(pid == 0){ // Child process
execve(path, argv, envp);
Exception e = { strerror(errno) };
RAISE(e);
} else { // Parent process
int wstatus;
wait(&wstatus);
if(WIFEXITED(wstatus)){ // Normal exit
result = WEXITSTATUS(wstatus);
}
}
} ELSE {
exit(EXIT_FAILURE);
} END_TRY;
return result;
}
/*---------- Networking Sockets --------*/
int ext_socket(int domain, int type, int protocol){
int status = socket(domain,type,protocol);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_bind(int sockfd, const SA *addr,socklen_t addrlen){
int status = bind(sockfd,addr,addrlen);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_listen(int sockfd, int backlog){
int status = listen(sockfd,backlog);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_connect(int sockfd, const SA *addr, socklen_t addrlen){
int status = connect(sockfd, addr,addrlen);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
};
return status;
}
int ext_accept(int sockfd, SA *addr, socklen_t *addrlen){
int status = accept(sockfd,addr,addrlen);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
/*---------- Epoll ---------------------*/
int ext_epoll_create(int flags){
int status = epoll_create1(flags);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_epoll_ctl(int epfd, int op, int fd, uint32_t events){
struct epoll_event ev;
ev.events = events;
ev.data.fd = fd;
int status = epoll_ctl(epfd, op, fd, &ev);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_setnonblocking(int fd){
int status = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
if(status == -1) {
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}
int ext_epoll_wait(int epfd, struct epoll_event *events,int maxevents, int timeout){
int status = epoll_wait(epfd, events,maxevents,timeout);
if(status == -1){
Exception e = { strerror(errno) };
RAISE(e);
}
return status;
}

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#include "../include/except.h"
#include "../include/mem.h"
#include <stdlib.h>
#define sizeof(x) (ptrdiff_t)sizeof(x)
#define NELEMS(a) (sizeof(a) / sizeof(*(a)))
#define LEN(s) (NELEMS(s) - 1)
const Exception out_of_memory = { "Out Of Memory" }; // OOM Exception.
void *mem_alloc(size_t nbytes, const char *file, int line){
void *ptr; // Memory to allocate.
ASSERT(nbytes > 0);
ptr = malloc(nbytes); // Attempt allocation.
if (ptr == NULL){ // Out of memory, raise exception .
if (file == NULL) // Wasn't called by macro.
RAISE(out_of_memory);
else // Called by macro.
except_raise(&out_of_memory, file, line);
}
// Success, return allocated memory.
return ptr;
}
void *mem_calloc(size_t count, size_t nbytes,const char *file, int line) {
void *ptr; // Memory to allocate.
ASSERT(count > 0);
ASSERT(nbytes > 0);
ptr = calloc(count, nbytes);// Attempt allocation and zero out memory.
if (ptr == NULL){ // Out of memory raise exception.
if (file == NULL) // Wasn't called by macro.
RAISE(out_of_memory);
else // Was called by macro.
except_raise(&out_of_memory, file, line);
}
// Success, return allocated and zeroed memory.
return ptr;
}
void mem_free(void *ptr, const char *file, int line) {
(void) file;
(void) line;
if (ptr){// If we have valid pointer, free and null.
free(ptr);
ptr = NULL;
}
}
void *mem_realloc(void *ptr, size_t nbytes, const char *file, int line) {
ASSERT(ptr);
ASSERT(nbytes > 0);
ptr = realloc(ptr, nbytes); // Attempt reallocation.
if (ptr == NULL){ // Out of memory, raise exception.
if (file == NULL) // Wasn't called by macro.
RAISE(out_of_memory);
else // Called by macro.
except_raise(&out_of_memory, file, line);
}
// Success, return reallocated memory.
return ptr;
}

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#include "../include/onbsd.h"
#include "../include/exectd.h"
#include "../include/mem.h"
#include <string.h>
void init_mgr(Mgr *m){
memset(m, 0, sizeof(*m));
m->conns = NULL;
}
Conn *mgr_listen(Mgr *m, int port, int interface, CbFn fn, void * fn_data){
// Allocate listening connection.
Conn *c = CALLOC(1, sizeof(*c));
c->is_listening = 1;
int on = 1;
// Set the address options
c->loc.sin_family = AF_INET;
c->loc.sin_port = htons(port);
c->loc.sin_addr.s_addr = htonl(interface);
// Create file descriptor for connection
c->fd = ext_socket(AF_INET, SOCK_STREAM, 0);
setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
ext_bind(c->fd, (SA *)&c->loc,sizeof(c->loc));
ext_setnonblocking(c->fd);
ext_listen(c->fd, SOMAXCONN);
// Create epollfd and subscribe events to connfd
c->fn = fn;
c->fn_data = fn_data;
c->epfd = ext_epoll_create(0);
c->ev.events = EPOLLIN|EPOLLET;
c->ev.data.fd = c->fd;
ext_epoll_ctl(c->epfd, EPOLL_CTL_ADD, c->fd, c->ev.events);
// Pair the manager with the connection and then add it.
c->mgr = m;
c->next = m->conns;
m->conns = c;
fn(c,EV_OPEN,fn_data);
return c;
}
Conn *mgr_accept(Conn *c, int fd, SA_IN addr){
// Allocate and accept new remote connection.
Conn *nc = CALLOC(1,sizeof(*nc));
nc->is_accepted = 1;
nc->fd = fd;
nc->rem = addr;
nc->loc = c->loc;
ext_setnonblocking(nc->fd);
// Create epoll fd and subscribe to events.
nc->epfd = ext_epoll_create(0);
nc->ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP | EPOLLHUP | EPOLLERR;
nc->ev.data.fd = nc->fd;
ext_epoll_ctl(nc->epfd, EPOLL_CTL_ADD, nc->fd, nc->ev.events);
// Set options and inherit connection details.
nc->mgr = c->mgr;
nc->fn = c->fn;
nc->fn_data = c->fn_data;
nc->next = c->mgr->conns;
c->mgr->conns = nc;
nc->fn(nc,EV_OPEN,nc->fn_data);
return nc;
}
Conn *mgr_connect(Mgr *m, CbFn fn, void *fn_data){
// Allocate listening connection.
Conn *c = CALLOC(1, sizeof(*c));
c->is_client = 1;
// Create file descriptor for connection
c->fd = ext_socket(AF_INET, SOCK_STREAM, 0);
SA_IN addr;
socklen_t addrlen = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_port = htons(3000);
c->loc.sin_port = htons(3000);
inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
c->loc.sin_addr = addr.sin_addr;
ext_connect(c->fd, (SA *)&addr,addrlen);
ext_setnonblocking(c->fd);
c->rem = addr;
// Create epollfd and subscribe events to connfd
c->fn = fn;
c->fn_data = fn_data;
c->epfd = ext_epoll_create(0);
c->ev.events = EPOLLIN|EPOLLET|EPOLLOUT|EPOLLERR|EPOLLHUP|EPOLLRDHUP;
c->ev.data.fd = c->fd;
ext_epoll_ctl(c->epfd, EPOLL_CTL_ADD, c->fd, c->ev.events);
// Pair the manager with the connection and then add it.
c->mgr = m;
c->next = m->conns;
m->conns = c;
fn(c,EV_OPEN,fn_data);
return c;
}
void use_fd(Mgr *m, Conn *c, int n){
(void)m;
if (c->events[n].events & EPOLLIN) {
// Accepted connection: read requests, write responses
char *buf[BUFSIZ];
int b = read(c->fd, buf, BUFSIZ);
if (b < 0 && errno == EAGAIN) {
// No data yet, do nothing
} else if (b <= 0) {
c->is_closing = 1;
} else {
c->fn(c, EV_READ,NULL);
}
}
}
void mgr_poll(Mgr *m, int timeout){
Conn **head = &m->conns;
while (*head != NULL) { // Iterate over all connections.
Conn *c = *head;
if (c->is_closing) { // If they are closing we don't care about events
*head = c->next; // Remove connection from the list
c->fn(c, EV_CLOSE,c->fn_data);
ext_close(c->fd);
FREE(c);
} else { // Connection isn't closing, iterate over events on connection.
int nfds = ext_epoll_wait(c->epfd, c->events, MAX_EVENTS, timeout);
for (int n = 0; n < nfds; ++n) {
// Handle Listening Events
if(c->events[n].data.fd == c->fd && c->is_listening){
SA_IN addr;
socklen_t addrlen = sizeof(addr);
int cli = ext_accept(c->events[n].data.fd,(SA *)&addr, &addrlen);
Conn *nc = mgr_accept(c, cli, addr);
(void)nc;
} else{
use_fd(m,c,n);
}
}
c->fn(c,EV_POLL,c->fn_data);
head = &c->next; // Move to next connection
}
}
}

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#define DEBUG
#include "../include/onbsd.h"
#include <stdlib.h>
void ev_handler(Conn *c, int events, void *ptr){
(void)ptr;
switch(events){
case EV_POLL:
if(c->is_listening){
fprintf(stdout,"EV_POLL - Listening for connections on %s:%hu", inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port));
}
if(c->is_accepted){
fprintf(stdout,"EV_POLL - Remote connection %s:%hu", inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
}
if(c->is_client){
fprintf(stdout,"EV_POLL - Local connection %s:%hu", inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port));
}
break;
case EV_OPEN:
if(c->is_listening){
fprintf(stdout,"EV_OPEN - Listening for connections on %s:%hu", inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port));
}
if(c->is_accepted){
fprintf(stdout,"EV_OPEN - Opening connection on %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
}
if(c->is_client){
fprintf(stdout,"EV_OPEN - Opening connection on %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
}
break;
case EV_READ:
fprintf(stdout,"EV_READ - Reading connection %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
break;
case EV_CLOSE:
fprintf(stdout,"EV_CLOSE - Closing connections on %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
break;
default:
break;
}
fprintf(stdout,"\n");
fflush(stdout);
}
int main(void){
Mgr m;
init_mgr(&m);
mgr_listen(&m, 3000, INADDR_LOOPBACK, ev_handler, NULL);
for(;;){
mgr_poll(&m,5000);
}
return EXIT_SUCCESS;
}

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#include "../include/onbsd.h"
#include <stdbool.h>
#define PORT 3000
#define DEBUG
void ev_handler(Conn *c, int events, void *ptr){
(void)ptr;
switch(events){
case EV_POLL:
if(c->is_listening){
fprintf(stdout,"EV_POLL - Listening for connections on %s:%hu", inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port));
}
if(c->is_accepted){
fprintf(stdout,"EV_POLL - Remote connection %s:%hu", inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
}
if(c->is_client){
fprintf(stdout,"EV_POLL - Local connection %s:%hu", inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port));
}
break;
case EV_OPEN:
if(c->is_listening){
fprintf(stdout,"EV_OPEN - Listening for connections on %s:%hu", inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port));
}
if(c->is_accepted){
fprintf(stdout,"EV_OPEN - Opening connection on %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
}
if(c->is_client){
fprintf(stdout,"EV_OPEN - Opening connection on %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
}
break;
case EV_READ:
fprintf(stdout,"EV_READ - Reading connection %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
break;
case EV_CLOSE:
fprintf(stdout,"EV_CLOSE - Closing connections on %s:%hu from %s:%hu",
inet_ntoa(c->loc.sin_addr), ntohs(c->loc.sin_port),
inet_ntoa(c->rem.sin_addr), ntohs(c->rem.sin_port));
break;
default:
break;
}
fprintf(stdout,"\n");
fflush(stdout);
}
int main(void){
Mgr c;
init_mgr(&c);
mgr_connect(&c,ev_handler,NULL);
for(;;){
mgr_poll(&c,3000);
}
return 0;
}