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homework-jianmu/tests/examples/c/epoll.c

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/*
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the GNU Affero General Public License, version 3
* or later ("AGPL"), as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef __APPLE__
#include "eok.h"
#else // __APPLE__
#include <sys/epoll.h>
#endif // __APPLE__
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <libgen.h>
#define D(fmt, ...) fprintf(stderr, "%s[%d]%s(): " fmt "\n", basename(__FILE__), __LINE__, __func__, ##__VA_ARGS__)
#define A(statement, fmt, ...) do { \
if (statement) break; \
fprintf(stderr, "%s[%d]%s(): assert [%s] failed: %d[%s]: " fmt "\n", \
basename(__FILE__), __LINE__, __func__, \
#statement, errno, strerror(errno), \
##__VA_ARGS__); \
abort(); \
} while (0)
#define E(fmt, ...) do { \
fprintf(stderr, "%s[%d]%s(): %d[%s]: " fmt "\n", \
basename(__FILE__), __LINE__, __func__, \
errno, strerror(errno), \
##__VA_ARGS__); \
} while (0)
typedef struct ep_s ep_t;
struct ep_s {
int ep;
pthread_mutex_t lock;
int sv[2]; // 0 for read, 1 for write;
pthread_t thread;
volatile unsigned int stopping:1;
volatile unsigned int waiting:1;
volatile unsigned int wakenup:1;
};
static int ep_dummy = 0;
static ep_t* ep_create(void);
static void ep_destroy(ep_t *ep);
static void* routine(void* arg);
static int open_connect(unsigned short port);
static int open_listen(unsigned short port);
typedef struct client_s client_t;
struct client_s {
int skt;
void (*on_event)(ep_t *ep, struct epoll_event *events, client_t *client);
volatile unsigned int state; // 1: listenning; 2: connected
};
static void echo_event(ep_t *ep, struct epoll_event *ev, client_t *client);
int main(int argc, char *argv[]) {
ep_t* ep = ep_create();
A(ep, "failed");
int skt = open_connect(6789);
if (skt!=-1) {
client_t *client = (client_t*)calloc(1, sizeof(*client));
if (client) {
client->skt = skt;
client->on_event = echo_event;
client->state = 2;
struct epoll_event ev = {0};
ev.events = EPOLLIN | EPOLLERR | EPOLLHUP | EPOLLRDHUP;
ev.data.ptr = client;
A(0==epoll_ctl(ep->ep, EPOLL_CTL_ADD, skt, &ev), "");
}
}
skt = open_listen(0);
if (skt!=-1) {
client_t *client = (client_t*)calloc(1, sizeof(*client));
if (client) {
client->skt = skt;
client->on_event = echo_event;
client->state = 1;
struct epoll_event ev = {0};
ev.events = EPOLLIN | EPOLLERR | EPOLLHUP | EPOLLRDHUP;
ev.data.ptr = client;
A(0==epoll_ctl(ep->ep, EPOLL_CTL_ADD, skt, &ev), "");
}
}
// char c = '\0';
// while ((c=getchar())!=EOF) {
// switch (c) {
// case 'q': break;
// default: continue;
// }
// }
// getchar();
char *line = NULL;
size_t linecap = 0;
ssize_t linelen;
while ((linelen = getline(&line, &linecap, stdin)) > 0) {
line[strlen(line)-1] = '\0';
if (0==strcmp(line, "exit")) break;
if (0==strcmp(line, "quit")) break;
if (line==strstr(line, "close")) {
int fd = 0;
sscanf(line, "close %d", &fd);
if (fd<=2) {
fprintf(stderr, "fd [%d] invalid\n", fd);
continue;
}
A(0==epoll_ctl(ep->ep, EPOLL_CTL_DEL, fd, NULL), "");
continue;
}
if (strlen(line)==0) continue;
fprintf(stderr, "unknown cmd:[%s]\n", line);
}
ep_destroy(ep);
D("");
return 0;
}
ep_t* ep_create(void) {
ep_t *ep = (ep_t*)calloc(1, sizeof(*ep));
A(ep, "out of memory");
A(-1!=(ep->ep = epoll_create(1)), "");
ep->sv[0] = -1;
ep->sv[1] = -1;
A(0==socketpair(AF_LOCAL, SOCK_STREAM, 0, ep->sv), "");
A(0==pthread_mutex_init(&ep->lock, NULL), "");
A(0==pthread_mutex_lock(&ep->lock), "");
struct epoll_event ev = {0};
ev.events = EPOLLIN;
ev.data.ptr = &ep_dummy;
A(0==epoll_ctl(ep->ep, EPOLL_CTL_ADD, ep->sv[0], &ev), "");
A(0==pthread_create(&ep->thread, NULL, routine, ep), "");
A(0==pthread_mutex_unlock(&ep->lock), "");
return ep;
}
static void ep_destroy(ep_t *ep) {
A(ep, "invalid argument");
ep->stopping = 1;
A(1==send(ep->sv[1], "1", 1, 0), "");
A(0==pthread_join(ep->thread, NULL), "");
A(0==pthread_mutex_destroy(&ep->lock), "");
A(0==close(ep->sv[0]), "");
A(0==close(ep->sv[1]), "");
A(0==close(ep->ep), "");
free(ep);
}
static void* routine(void* arg) {
A(arg, "invalid argument");
ep_t *ep = (ep_t*)arg;
while (!ep->stopping) {
struct epoll_event evs[10];
memset(evs, 0, sizeof(evs));
A(0==pthread_mutex_lock(&ep->lock), "");
A(ep->waiting==0, "internal logic error");
ep->waiting = 1;
A(0==pthread_mutex_unlock(&ep->lock), "");
int r = epoll_wait(ep->ep, evs, sizeof(evs)/sizeof(evs[0]), -1);
A(r>0, "indefinite epoll_wait shall not timeout:[%d]", r);
A(0==pthread_mutex_lock(&ep->lock), "");
A(ep->waiting==1, "internal logic error");
ep->waiting = 0;
A(0==pthread_mutex_unlock(&ep->lock), "");
for (int i=0; i<r; ++i) {
struct epoll_event *ev = evs + i;
if (ev->data.ptr == &ep_dummy) {
char c = '\0';
A(1==recv(ep->sv[0], &c, 1, 0), "internal logic error");
A(0==pthread_mutex_lock(&ep->lock), "");
ep->wakenup = 0;
A(0==pthread_mutex_unlock(&ep->lock), "");
D("........");
continue;
}
A(ev->data.ptr, "internal logic error");
client_t *client = (client_t*)ev->data.ptr;
client->on_event(ep, ev, client);
continue;
}
}
return NULL;
}
static int open_listen(unsigned short port) {
int r = 0;
int skt = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (skt==-1) {
E("socket() failed");
return -1;
}
do {
struct sockaddr_in si = {0};
si.sin_family = AF_INET;
si.sin_addr.s_addr = inet_addr("127.0.0.1");
si.sin_port = htons(port);
r = bind(skt, (struct sockaddr*)&si, sizeof(si));
if (r) {
E("bind(%u) failed", port);
break;
}
r = listen(skt, 100);
if (r) {
E("listen() failed");
break;
}
memset(&si, 0, sizeof(si));
socklen_t len = sizeof(si);
r = getsockname(skt, (struct sockaddr *)&si, &len);
if (r) {
E("getsockname() failed");
}
A(len==sizeof(si), "internal logic error");
D("listenning at: %d", ntohs(si.sin_port));
return skt;
} while (0);
close(skt);
return -1;
}
static int open_connect(unsigned short port) {
int r = 0;
int skt = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (skt==-1) {
E("socket() failed");
return -1;
}
do {
struct sockaddr_in si = {0};
si.sin_family = AF_INET;
si.sin_addr.s_addr = inet_addr("127.0.0.1");
si.sin_port = htons(port);
r = connect(skt, (struct sockaddr*)&si, sizeof(si));
if (r) {
E("connect(%u) failed", port);
break;
}
memset(&si, 0, sizeof(si));
socklen_t len = sizeof(si);
r = getsockname(skt, (struct sockaddr *)&si, &len);
if (r) {
E("getsockname() failed");
}
A(len==sizeof(si), "internal logic error");
D("connected: %d", ntohs(si.sin_port));
return skt;
} while (0);
close(skt);
return -1;
}
static void echo_event(ep_t *ep, struct epoll_event *ev, client_t *client) {
if (ev->events & EPOLLIN) {
if (client->state==1) {
struct sockaddr_in si = {0};
socklen_t silen = sizeof(si);
int skt = accept(client->skt, (struct sockaddr*)&si, &silen);
if (skt!=-1) {
client_t *server = (client_t*)calloc(1, sizeof(*server));
if (server) {
server->skt = skt;
server->on_event = echo_event;
server->state = 2;
struct epoll_event ev = {0};
ev.events = EPOLLIN | EPOLLERR | EPOLLHUP | EPOLLRDHUP;
ev.data.ptr = server;
A(0==epoll_ctl(ep->ep, EPOLL_CTL_ADD, skt, &ev), "");
}
}
}
if (client->state==2) {
char buf[4];
int n = recv(client->skt, buf, sizeof(buf)-1, 0);
A(n>=0 && n<sizeof(buf), "internal logic error:[%d]", n);
buf[n] = '\0';
fprintf(stderr, "events[%x]:%s\n", ev->events, buf);
}
}
if (ev->events & (EPOLLERR | EPOLLHUP | EPOLLRDHUP)) {
A(0==pthread_mutex_lock(&ep->lock), "");
A(0==epoll_ctl(ep->ep, EPOLL_CTL_DEL, client->skt, NULL), "");
A(0==pthread_mutex_unlock(&ep->lock), "");
close(client->skt);
client->skt = -1;
client->on_event = NULL;
free(client);
}
}
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