From 0c77388a988ba1720ea996de6dc4a02761007896 Mon Sep 17 00:00:00 2001
From: Guo Wenxue <guowenxue@gmail.com>
Date: Wed, 28 Nov 2018 10:13:43 +0800
Subject: [PATCH] Add poll socket server implement
---
ch5_multiplexing/socket_server_poll.c | 257 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 257 insertions(+), 0 deletions(-)
diff --git a/ch5_multiplexing/socket_server_poll.c b/ch5_multiplexing/socket_server_poll.c
new file mode 100644
index 0000000..c1a7ddd
--- /dev/null
+++ b/ch5_multiplexing/socket_server_poll.c
@@ -0,0 +1,257 @@
+#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 <poll.h>
+
+#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);
+
+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;
+ int max;
+ char buf[1024];
+ struct pollfd fds_array[1024];
+
+ 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;
+ }
+
+ 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);
+ }
+
+ for(i=0; i<ARRAY_SIZE(fds_array) ; i++)
+ {
+ fds_array[i].fd=-1;
+ }
+ fds_array[0].fd = listenfd;
+ fds_array[0].events = POLLIN;
+
+ max = 0;
+
+ for ( ; ; )
+ {
+ /* program will blocked here */
+ rv = poll(fds_array, max+1, -1);
+ if(rv < 0)
+ {
+ printf("select failure: %s\n", strerror(errno));
+ break;
+ }
+ else if(rv == 0)
+ {
+ printf("select get timeout\n");
+ continue;
+ }
+
+ /* listen socket get event means new client start connect now */
+ if (fds_array[0].revents & POLLIN)
+ {
+ if( (connfd=accept(listenfd, (struct sockaddr *)NULL, NULL)) < 0)
+ {
+ printf("accept new client failure: %s\n", strerror(errno));
+ continue;
+ }
+
+ found = 0;
+ for(i=1; i<ARRAY_SIZE(fds_array) ; i++)
+ {
+ if( fds_array[i].fd < 0 )
+ {
+ printf("accept new client[%d] and add it into array\n", connfd );
+ fds_array[i].fd = connfd;
+ fds_array[i].events = POLLIN;
+ found = 1;
+ break;
+ }
+ }
+
+ if( !found )
+ {
+ printf("accept new client[%d] but full, so refuse it\n", connfd);
+ close(connfd);
+ continue;
+ }
+
+ max = i>max ? i : max;
+ if (--rv <= 0)
+ continue;
+ }
+ else /* data arrive from already connected client */
+ {
+ for(i=1; i<ARRAY_SIZE(fds_array); i++)
+ {
+ if( fds_array[i].fd < 0 )
+ continue;
+
+ if( (rv=read(fds_array[i].fd, buf, sizeof(buf))) <= 0)
+ {
+ printf("socket[%d] read failure or get disconncet.\n", fds_array[i].fd);
+ close(fds_array[i].fd);
+ fds_array[i].fd = -1;
+ }
+ else
+ {
+ printf("socket[%d] read get %d bytes data\n", fds_array[i].fd, rv);
+
+ /* convert letter from lowercase to uppercase */
+ for(j=0; j<rv; j++)
+ buf[j]=toupper(buf[j]);
+
+ if( write(fds_array[i].fd, buf, rv) < 0 )
+ {
+ printf("socket[%d] write failure: %s\n", fds_array[i].fd, strerror(errno));
+ close(fds_array[i].fd);
+ fds_array[i].fd = -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;
+}
+
--
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