From 6c41fb183d2ea71bb8d3a7bf4947f28eacfe97fe Mon Sep 17 00:00:00 2001
From: Guo Wenxue <guowenxue@gmail.com>
Date: Fri, 16 Nov 2018 13:52:26 +0800
Subject: [PATCH] update socket server fork program, add convert lowercase to uppercase support
---
ch3_fork/socket_server_fork.c | 82 +++++++++++++++++++++-------------------
1 files changed, 43 insertions(+), 39 deletions(-)
diff --git a/ch3_fork/socket_server.c b/ch3_fork/socket_server_fork.c
similarity index 63%
rename from ch3_fork/socket_server.c
rename to ch3_fork/socket_server_fork.c
index 3780019..6b40678 100644
--- a/ch3_fork/socket_server.c
+++ b/ch3_fork/socket_server_fork.c
@@ -7,8 +7,7 @@
#include <arpa/inet.h>
#include <stdlib.h>
#include <getopt.h>
-
-#define MSG_STR "Hello LingYun IoT Studio Client\n"
+#include <ctype.h>
void print_usage(char *progname)
{
@@ -72,8 +71,8 @@
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_port = htons(port);
- servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
- //inet_aton("192.168.0.16", &servaddr.sin_addr);
+ servaddr.sin_addr.s_addr = htonl(INADDR_ANY); /* listen all the IP address on this host */
+ //inet_aton("192.168.0.16", &servaddr.sin_addr); /* Only listen specify IP address on this host */
rv=bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
if(rv < 0)
@@ -96,8 +95,7 @@
continue;
}
- printf("Accept new client[%s:%d] successfully\n",
- inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port));
+ printf("Accept new client[%s:%d] successfully\n", inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port));
pid = fork();
if( pid < 0 )
@@ -115,44 +113,50 @@
else if ( 0 == pid )
{
char buf[1024];
+ int i;
- /* Child process close the listen socket fd */
- close(sockfd);
-
printf("Child process start to commuicate with socket client...\n");
- memset(buf, 0, sizeof(buf));
- rv=read(clifd, buf, sizeof(buf));
- if( rv < 0)
- {
- printf("Read data from client sockfd[%d] failure: %s\n", clifd, strerror(errno));
- close(clifd);
- exit(0);
- }
- else if( rv == 0)
- {
- printf("Socket[%d] get disconnected\n", clifd);
- close(clifd);
- exit(0);
- }
- else if( rv > 0 )
+
+ close(sockfd); /* Child process close the listen socket fd */
+
+ while(1)
{
- printf("Read %d bytes data from Server: %s\n", rv, buf);
- }
-
- rv=write(clifd, MSG_STR, strlen(MSG_STR));
- if(rv < 0)
- {
- printf("Write to client by sockfd[%d] failure: %s\n", clifd, strerror(errno));
- close(clifd);
- exit(0);
- }
+ memset(buf, 0, sizeof(buf));
+ rv=read(clifd, buf, sizeof(buf));
+ if( rv < 0 )
+ {
+ printf("Read data from client sockfd[%d] failure: %s\n", clifd, strerror(errno));
+ close(clifd);
+ exit(0);
+ }
+ else if( rv == 0)
+ {
+ printf("Socket[%d] get disconnected\n", clifd);
+ close(clifd);
+ exit(0);
+ }
+ else if( rv > 0 )
+ {
+ printf("Read %d bytes data from Server: %s\n", rv, buf);
+ }
- sleep(1);
+ /* convert letter from lowercase to uppercase */
+ for(i=0; i<rv; i++)
+ {
+ buf[i]=toupper(buf[i]);
+ }
- printf("close client socket[%d] and child process exit\n", clifd);
- close(clifd);
- exit(0);
- }
+ rv=write(clifd, buf, rv);
+ if(rv < 0)
+ {
+ printf("Write to client by sockfd[%d] failure: %s\n", clifd, strerror(errno));
+ close(clifd);
+ exit(0);
+ }
+
+ } /* Child process loop */
+
+ } /* Child process start*/
}
--
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