From 259a0a094fe34ecaa9d8bdb38e6cbb9d212cccae Mon Sep 17 00:00:00 2001
From: Guo Wenxue <guowenxue@gmail.com>
Date: Fri, 30 Nov 2018 18:48:41 +0800
Subject: [PATCH] update socket server poll implement, add socket server epoll implement
---
ch5_multiplexing/socket_server_poll.c | 4
ch5_multiplexing/socket_server_epoll.c | 276 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 278 insertions(+), 2 deletions(-)
diff --git a/ch5_multiplexing/socket_server_epoll.c b/ch5_multiplexing/socket_server_epoll.c
new file mode 100644
index 0000000..5c9b2b2
--- /dev/null
+++ b/ch5_multiplexing/socket_server_epoll.c
@@ -0,0 +1,276 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <time.h>
+#include <pthread.h>
+#include <getopt.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/epoll.h>
+#include <sys/resource.h>
+
+#define MAX_EVENTS 512
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
+static inline void print_usage(char *progname);
+int socket_server_init(char *listen_ip, int listen_port);
+void set_socket_rlimit(void);
+
+int main(int argc, char **argv)
+{
+ int listenfd, connfd;
+ int serv_port = 0;
+ int daemon_run = 0;
+ char *progname = NULL;
+ int opt;
+ int rv;
+ int i, j;
+ int found;
+ char buf[1024];
+
+ int epollfd;
+ struct epoll_event event;
+ struct epoll_event event_array[MAX_EVENTS];
+ int events;
+
+ struct option long_options[] =
+ {
+ {"daemon", no_argument, NULL, 'b'},
+ {"port", required_argument, NULL, 'p'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ progname = basename(argv[0]);
+
+ /* Parser the command line parameters */
+ while ((opt = getopt_long(argc, argv, "bp:h", long_options, NULL)) != -1)
+ {
+ switch (opt)
+ {
+ case 'b':
+ daemon_run=1;
+ break;
+
+ case 'p':
+ serv_port = atoi(optarg);
+ break;
+
+ case 'h': /* Get help information */
+ print_usage(progname);
+ return EXIT_SUCCESS;
+
+ default:
+ break;
+ }
+ }
+
+ if( !serv_port )
+ {
+ print_usage(progname);
+ return -1;
+ }
+
+ set_socket_rlimit(); /* set max open socket count */
+
+ if( (listenfd=socket_server_init(NULL, serv_port)) < 0 )
+ {
+ printf("ERROR: %s server listen on port %d failure\n", argv[0],serv_port);
+ return -2;
+ }
+ printf("%s server start to listen on port %d\n", argv[0],serv_port);
+
+
+ /* set program running on background */
+ if( daemon_run )
+ {
+ daemon(0, 0);
+ }
+
+ if( (epollfd=epoll_create(MAX_EVENTS)) < 0 )
+ {
+ printf("epoll_create() failure: %s\n", strerror(errno));
+ return -3;
+ }
+
+ event.events = EPOLLIN|EPOLLET;
+ event.data.fd = listenfd;
+
+ if( epoll_ctl(epollfd, EPOLL_CTL_ADD, listenfd, &event) < 0)
+ {
+ printf("epoll add listen socket failure: %s\n", strerror(errno));
+ return -4;
+ }
+
+
+ for ( ; ; )
+ {
+ /* program will blocked here */
+ events = epoll_wait(epollfd, event_array, MAX_EVENTS, -1);
+ if(events < 0)
+ {
+ printf("epoll failure: %s\n", strerror(errno));
+ break;
+ }
+ else if(events == 0)
+ {
+ printf("epoll get timeout\n");
+ continue;
+ }
+
+ /* rv>0 is the active events count */
+ for(i=0; i<events; i++)
+ {
+ if ( (event_array[i].events&EPOLLERR) || (event_array[i].events&EPOLLHUP) )
+ {
+ printf("epoll_wait get error on fd[%d]: %s\n", event_array[i].data.fd, strerror(errno));
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, event_array[i].data.fd, &event);
+ close(event_array[i].data.fd);
+ }
+
+ /* listen socket get event means new client start connect now */
+ if( event_array[i].data.fd == listenfd )
+ {
+ if( (connfd=accept(listenfd, (struct sockaddr *)NULL, NULL)) < 0)
+ {
+ printf("accept new client failure: %s\n", strerror(errno));
+ continue;
+ }
+
+ event.data.fd = connfd;
+ event.events = EPOLLIN|EPOLLET;
+ if( epoll_ctl(epollfd, EPOLL_CTL_ADD, connfd, &event) < 0 )
+ {
+ printf("epoll add client socket failure: %s\n", strerror(errno));
+ close(event_array[i].data.fd);
+ continue;
+ }
+ printf("epoll add new client socket[%d] ok.\n", connfd);
+ }
+ else /* already connected client socket get data incoming */
+ {
+ if( (rv=read(event_array[i].data.fd, buf, sizeof(buf))) <= 0)
+ {
+ printf("socket[%d] read failure or get disconncet and will be removed.\n", event_array[i].data.fd);
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, event_array[i].data.fd, &event);
+ close(event_array[i].data.fd);
+ continue;
+ }
+ else
+ {
+ printf("socket[%d] read get %d bytes data\n", event_array[i].data.fd, rv);
+
+ /* convert letter from lowercase to uppercase */
+ for(j=0; j<rv; j++)
+ buf[j]=toupper(buf[j]);
+
+ if( write(event_array[i].data.fd, buf, rv) < 0 )
+ {
+ printf("socket[%d] write failure: %s\n", event_array[i].data.fd, strerror(errno));
+ epoll_ctl(epollfd, EPOLL_CTL_ADD, event_array[i].data.fd, &event);
+ close(event_array[i].data.fd);
+ }
+ }
+ }
+ } /* for(i=0; i<rv; i++) */
+ } /* while(1) */
+
+CleanUp:
+ close(listenfd);
+ return 0;
+}
+
+
+static inline void print_usage(char *progname)
+{
+ printf("Usage: %s [OPTION]...\n", progname);
+
+ printf(" %s is a socket server program, which used to verify client and echo back string from it\n", progname);
+ printf("\nMandatory arguments to long options are mandatory for short options too:\n");
+
+ printf(" -b[daemon ] set program running on background\n");
+ printf(" -p[port ] Socket server port address\n");
+ printf(" -h[help ] Display this help information\n");
+
+
+ printf("\nExample: %s -b -p 8900\n", progname);
+ return ;
+}
+
+
+int socket_server_init(char *listen_ip, int listen_port)
+{
+ struct sockaddr_in servaddr;
+ int rv = 0;
+ int on = 1;
+ int listenfd;
+
+ if ( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+ {
+ printf("Use socket() to create a TCP socket failure: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Set socket port reuseable, fix 'Address already in use' bug when socket server restart */
+ setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+
+ memset(&servaddr, 0, sizeof(servaddr));
+ servaddr.sin_family = AF_INET;
+ servaddr.sin_port = htons(listen_port);
+
+ if( !listen_ip ) /* Listen all the local IP address */
+ {
+ servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+ }
+ else /* listen the specified IP address */
+ {
+ if (inet_pton(AF_INET, listen_ip, &servaddr.sin_addr) <= 0)
+ {
+ printf("inet_pton() set listen IP address failure.\n");
+ rv = -2;
+ goto CleanUp;
+ }
+ }
+
+
+ if(bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0)
+ {
+ printf("Use bind() to bind the TCP socket failure: %s\n", strerror(errno));
+ rv = -3;
+ goto CleanUp;
+ }
+
+ if(listen(listenfd, 13) < 0)
+ {
+ printf("Use bind() to bind the TCP socket failure: %s\n", strerror(errno));
+ rv = -4;
+ goto CleanUp;
+ }
+
+CleanUp:
+ if(rv<0)
+ close(listenfd);
+ else
+ rv = listenfd;
+
+ return rv;
+}
+
+/* Set open file description count to max */
+void set_socket_rlimit(void)
+{
+ struct rlimit limit = {0};
+
+ getrlimit(RLIMIT_NOFILE, &limit );
+ limit.rlim_cur = limit.rlim_max;
+ setrlimit(RLIMIT_NOFILE, &limit );
+
+ printf("set socket open fd max count to %d\n", limit.rlim_max);
+}
+
diff --git a/ch5_multiplexing/socket_server_poll.c b/ch5_multiplexing/socket_server_poll.c
index c1a7ddd..f3cd128 100644
--- a/ch5_multiplexing/socket_server_poll.c
+++ b/ch5_multiplexing/socket_server_poll.c
@@ -100,12 +100,12 @@
rv = poll(fds_array, max+1, -1);
if(rv < 0)
{
- printf("select failure: %s\n", strerror(errno));
+ printf("poll failure: %s\n", strerror(errno));
break;
}
else if(rv == 0)
{
- printf("select get timeout\n");
+ printf("poll get timeout\n");
continue;
}
--
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