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/* netio_posix.c - netio implementation for POSIX-ish systems
* (actually uses a few GNU extensions)
*
* Copyright (C) 2024 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-Licence-Identifier: AGPL-3.0-or-later
*/
#define _GNU_SOURCE /* for pthread_sigqueue(3gnu) */
/* misc */
#include <assert.h> /* for assert() */
#include <errno.h> /* for errno, EAGAIN, EINVAL */
#include <error.h> /* for error(3gnu) */
#include <stdlib.h> /* for abs(), shutdown(), SHUT_RD, SHUT_WR, SHUT_RDWR */
#include <unistd.h> /* for read(), write() */
/* net */
#include <arpa/inet.h> /* for htons(3p) */
#include <netinet/in.h> /* for struct sockaddr_in */
#include <sys/socket.h> /* for struct sockaddr, socket(), SOCK_* flags, setsockopt(), SOL_SOCKET, SO_REUSEADDR, bind(), listen(), accept() */
/* async */
#include <pthread.h> /* for pthread_* */
#include <signal.h> /* for siginfo_t, struct sigaction, enum sigval, sigaction(), SIGRTMIN, SIGRTMAX, SA_SIGINFO */
#include <libcr/coroutine.h>
#include <libnetio/netio.h>
/* configuration **************************************************************/
#include "config.h"
#ifndef CONFIG_NETIO_NUM_CONNS
# error config.h must define CONFIG_NETIO_NUM_CONNS
#endif
/* common *********************************************************************/
#define UNUSED(name) /* name __attribute__ ((unused)) */
static int sig_io = 0;
static void handle_sig_io(int UNUSED(sig), siginfo_t *info, void *UNUSED(ucontext)) {
cr_unpause_from_intrhandler((cid_t)info->si_value.sival_int);
}
static void _netio_init(void) {
struct sigaction action = {0};
if (sig_io)
return;
sig_io = SIGRTMIN;
if (sig_io > SIGRTMAX)
error(1, 0, "SIGRTMAX exceeded");
action.sa_flags = SA_SIGINFO;
action.sa_sigaction = handle_sig_io;
if (sigaction(sig_io, &action, NULL) < 0)
error(1, errno, "sigaction");
}
#define WAKE_COROUTINE(args) do { \
int r; \
union sigval val = {0}; \
val.sival_int = (int)((args)->cr_coroutine); \
do { \
r = pthread_sigqueue((args)->cr_thread, sig_io, val); \
assert(r == 0 || r == EAGAIN); \
} while (r == EAGAIN); \
} while (0)
#define RUN_PTHREAD(fn, args) do { \
pthread_t thread; \
int r; \
r = pthread_create(&thread, NULL, fn, args); \
if (r) \
return -abs(r); \
cr_pause_and_yield(); \
r = pthread_join(thread, NULL); \
if (r) \
return -abs(r); \
} while (0)
/* listen() *******************************************************************/
int netio_listen(uint16_t port) {
int sockfd;
union {
struct sockaddr_in in;
struct sockaddr gen;
} addr = { 0 };
_netio_init();
addr.in.sin_family = AF_INET;
addr.in.sin_port = htons(port);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error(1, errno, "socket");
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) < 0)
error(1, errno, "setsockopt");
if (bind(sockfd, &addr.gen, sizeof addr) < 0)
error(1, errno, "bind");
if (listen(sockfd, CONFIG_NETIO_NUM_CONNS) < 0)
error(1, errno, "listen");
return sockfd;
}
/* accept() *******************************************************************/
struct _pthread_accept_args {
pthread_t cr_thread;
cid_t cr_coroutine;
int sockfd;
int *ret;
};
void *_pthread_accept(void *_args) {
struct _pthread_accept_args *args = _args;
*(args->ret) = accept(args->sockfd, NULL, NULL);
if (*(args->ret) < 0)
*(args->ret) = -errno;
WAKE_COROUTINE(args);
return NULL;
};
int netio_accept(int sock) {
int ret;
struct _pthread_accept_args args = {
.cr_thread = pthread_self(),
.cr_coroutine = cr_getcid(),
.sockfd = sock,
.ret = &ret,
};
RUN_PTHREAD(_pthread_accept, &args);
return ret;
}
/* read() *********************************************************************/
struct _pthread_read_args {
pthread_t cr_thread;
cid_t cr_coroutine;
int connfd;
void *buf;
size_t count;
ssize_t *ret;
};
void *_pthread_read(void *_args) {
struct _pthread_read_args *args = _args;
*(args->ret) = read(args->connfd, args->buf, args->count);
if (*(args->ret) < 0)
*(args->ret) = -errno;
WAKE_COROUTINE(args);
return NULL;
};
ssize_t netio_read(int conn, void *buf, size_t count) {
ssize_t ret;
struct _pthread_read_args args = {
.cr_thread = pthread_self(),
.cr_coroutine = cr_getcid(),
.connfd = conn,
.buf = buf,
.count = count,
.ret = &ret,
};
RUN_PTHREAD(_pthread_read, &args);
return ret;
}
/* write() ********************************************************************/
struct _pthread_write_args {
pthread_t cr_thread;
cid_t cr_coroutine;
int connfd;
void *buf;
size_t count;
ssize_t *ret;
};
void *_pthread_write(void *_args) {
struct _pthread_read_args *args = _args;
size_t done = 0;
while (done < args->count) {
ssize_t r = write(args->connfd, args->buf, args->count);
if (r < 0) {
*(args->ret) = -errno;
break;
}
done += r;
}
if (done == args->count)
*(args->ret) = done;
WAKE_COROUTINE(args);
return NULL;
};
ssize_t netio_write(int conn, void *buf, size_t count) {
ssize_t ret;
struct _pthread_write_args args = {
.cr_thread = pthread_self(),
.cr_coroutine = cr_getcid(),
.connfd = conn,
.buf = buf,
.count = count,
.ret = &ret,
};
RUN_PTHREAD(_pthread_write, &args);
return ret;
}
/* close() ********************************************************************/
int netio_close(int conn, bool rd, bool wr) {
int how;
if (rd && wr)
how = SHUT_RDWR;
else if (rd && !wr)
how = SHUT_RD;
else if (!rd && wr)
how = SHUT_WR;
else
return -EINVAL;
return shutdown(conn, how) ? -errno : 0;
}
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