modify p-client child return value

Makefile

@@ -1,6 +1,8 @@
 CC = gcc
 CFLAGS = -lm -Wall -O2
-Bin = server client p-server p-client
+ServerBin = server p-server
+ClientBin = client p-client
+Bin = $(ServerBin) $(ClientBin)
 
 all:
 	make $(Bin)
@@ -16,7 +18,17 @@ p-server: socket_wrapper.o p-server.c
 	$(CC) -o p-server p-server.c socket_wrapper.o $(CFLAGS)
 p-client: socket_wrapper.o p-client.c
 	$(CC) -o p-client p-client.c socket_wrapper.o $(CFLAGS)
+p-slowclient: socket_wrapper.o p-client.c
+	$(CC) -o p-slowclient p-client.c socket_wrapper.o $(CFLAGS) -D SLOW_CLIENT=10
 
-.PHONY: clean
+.PHONY: clean moveall
 clean:
 	rm *.o $(Bin)
+	rm $(addprefix client_test/,$(ClientBin))
+	rm $(addprefix server_test/,$(ServerBin))
+
+moveall:
+	mv client client_test/client
+	mv p-client client_test/p-client
+	mv server server_test/server
+	mv p-server server_test/p-server

README.md

@@ -10,9 +10,14 @@ Usage:
 ./client SERVERNAME PORT FILENAME
 ```
 
-available macro:
+Server OPTION and arguments:
+- `-p port`   :set to port binding. couldn't set to 0
+- `-h`        :print help message.
+
+Available macro:
 - DEFAULT_SERVER_PORT : 9091
 - DEFAULT_MAX_PATH_SIZE : 256(must be less than 1000)
 - TIMEOUT : 5(second unit)
 - USE_SENDFILE
-    - DEFAULT_SEND_FILE_CHUNK_SIZE : 0x100000(1MB)
+    - DEFAULT_SEND_FILE_CHUNK_SIZE : 0x100000(1MB)
+- SLOW_CLIENT(second unit)

p-client.c

@@ -39,6 +39,9 @@ int sendReadOp(int sock,const char * filename){
         perror("readop send fail");
         return -1;
     }
+    #ifdef SLOW_CLIENT
+    sleep(SLOW_CLIENT);
+    #endif
     if(send(sock,filename,op.file_url_size,0)<0){
         perror("readop filename send fail");
         return -1;

p-server.c

@@ -12,6 +12,7 @@
 #include <signal.h>
 #include <assert.h>
 #include <fcntl.h>
+#include <sys/wait.h>
 #include "socket_wrapper.h"
 
 static const int MAX_LISTEN_SOCKET = 16;
@@ -173,6 +174,39 @@ int send_response(int sock,int fd, uint8_t * buf, size_t bufsize){
 #endif
     return 0;
 }
+const char * help(const char * n){
+    const char * msg = "USASE : %s [Option] ...\n"
+    "Options and arguments: \n"
+    "-p port\t:set to port binding. couldn't set to 0\n"
+    "-h\t:print help message.\n";
+    printf(msg,n);
+    return msg;
+}
+/** return 0 ok. otherwise invalid format*/
+int parse_args(int argc,const char * argv[] , in_port_t * port){
+    int pos = 1;
+    const char * opt;
+    while (pos < argc)
+    {
+        opt = argv[pos++];
+        if (strcmp(opt,"-h") == 0 || strcmp(opt,"--help") == 0)
+        {
+            help(argv[0]);
+            return 2;
+        }
+        else if(strcmp(opt,"-p") == 0 || strcmp(opt,"--port") == 0){
+            if (pos < argc){
+                const char * value = argv[pos++];
+                *port = atoi(value);
+                if (port == 0){ // either not number or zero 
+                    return 2;
+                }
+            }
+            else return 2; //failed to find argument.
+        }
+    }
+    return 0;
+}
 static int sock;
 void safe_exit(){
     close(sock);
@@ -185,6 +219,11 @@ int main(int argc, const char *argv[]){
     int csock;
     int bufsize;
     int i;
+    in_port_t binding_port_number = SERVER_PORT;
+    if (argc > 1){
+        int d = parse_args(argc,argv,&binding_port_number);
+        if(d != 0 ) return d;
+    }
     sock = socket(AF_INET,SOCK_STREAM,0);
     atexit(safe_exit);
     if(sock < 0){
@@ -206,7 +245,7 @@ int main(int argc, const char *argv[]){
     
     addr.sin_addr.s_addr = htonl(INADDR_ANY); /*0.0.0.0 모든 네트워크 인터페이스에 묶임.*/
     addr.sin_family = AF_INET;
-    addr.sin_port = htons(SERVER_PORT);
+    addr.sin_port = htons(binding_port_number);
 
     if(bind(sock, (struct sockaddr *)&addr,sizeof(addr)) < 0){
         perror("bind failed");
@@ -215,7 +254,7 @@ int main(int argc, const char *argv[]){
         char ip_buf[INET_ADDRSTRLEN];
         const char * msg = inet_ntop(AF_INET,&addr.sin_addr,ip_buf,sizeof(ip_buf));
         assert(msg != NULL);
-        fprintf(stderr,"server bind on %s:%d\n",msg ,SERVER_PORT);
+        fprintf(stderr,"server bind on %s:%d\n",msg ,binding_port_number);
     }
     if(listen(sock,MAX_LISTEN_SOCKET) < 0){
         perror("listen failed");
@@ -227,6 +266,7 @@ int main(int argc, const char *argv[]){
         int fd, pid;
         char ip_buf[INET_ADDRSTRLEN];
         const char * msg;
+        int retval = 0;
         if((csock = accept(sock, (struct sockaddr *)&client_addr,&client_addr_len)) < 0){
             free(buf);
             perror("accept error");
@@ -237,15 +277,23 @@ int main(int argc, const char *argv[]){
         pid = fork();
         if(pid == 0){
             if((fd = read_request(csock,buf,bufsize)) > 0){
-                send_response(csock,fd,buf,bufsize);
+                retval = send_response(csock,fd,buf,bufsize);
                 close(fd);
             }
+            else retval = fd;
             if(close(csock) < 0)
                 perror("csock close error");
             free(buf);
-            return 0;
+            return retval;
         }
     }
+    for (i = 0; i < 3; i++)
+    {
+        int retval;
+        int pid = wait(&retval);
+        printf("[%d] %d: %d\n",i,pid,retval);
+    }
+    
     free(buf);
     return 0;
 }

pctest.sh

@@ -0,0 +1,3 @@
+#! /bin/bash
+cd client_test
+./p-slowclient localhost 9091 test.txt & ./p-client localhost 9091 test.txt & ./p-client localhost 9091 test.txt 

pstest.sh

@@ -0,0 +1,3 @@
+#! /bin/bash
+cd server_test
+./p-server

server.c

@@ -171,6 +171,39 @@ int send_response(int sock,int fd, uint8_t * buf, size_t bufsize){
 #endif
     return 0;
 }
+const char * help(const char * n){
+    const char * msg = "USASE : %s [Option] ...\n"
+    "Options and arguments: \n"
+    "-p port\t:set to port binding. couldn't set to 0\n"
+    "-h\t:print help message.\n";
+    printf(msg,n);
+    return msg;
+}
+/** return 0 ok. otherwise invalid format*/
+int parse_args(int argc,const char * argv[] , in_port_t * port){
+    int pos = 1;
+    const char * opt;
+    while (pos < argc)
+    {
+        opt = argv[pos++];
+        if (strcmp(opt,"-h") == 0 || strcmp(opt,"--help") == 0)
+        {
+            help(argv[0]);
+            return 2;
+        }
+        else if(strcmp(opt,"-p") == 0 || strcmp(opt,"--port") == 0){
+            if (pos < argc){
+                const char * value = argv[pos++];
+                *port = atoi(value);
+                if (port == 0){ // either not number or zero 
+                    return 2;
+                }
+            }
+            else return 2; //failed to find argument.
+        }
+    }
+    return 0;
+}
 
 static int sock;
 void safe_exit(){
@@ -183,6 +216,12 @@ int main(int argc, const char *argv[]){
     socklen_t client_addr_len = sizeof(client_addr);
     int csock;
     int bufsize;
+    in_port_t binding_port_number = SERVER_PORT;
+    if (argc > 1){
+        int d = parse_args(argc,argv,&binding_port_number);
+        if(d != 0 ) return d;
+    }
+    
     sock = socket(AF_INET,SOCK_STREAM,0);
     atexit(safe_exit);
     if(sock < 0){
@@ -204,7 +243,7 @@ int main(int argc, const char *argv[]){
     
     addr.sin_addr.s_addr = htonl(INADDR_ANY); /*0.0.0.0 모든 네트워크 인터페이스에 묶임.*/
     addr.sin_family = AF_INET;
-    addr.sin_port = htons(SERVER_PORT);
+    addr.sin_port = htons(binding_port_number);
 
     if(bind(sock, (struct sockaddr *)&addr,sizeof(addr)) < 0){
         perror("bind failed");
@@ -213,7 +252,7 @@ int main(int argc, const char *argv[]){
         char ip_buf[INET_ADDRSTRLEN];
         const char * msg = inet_ntop(AF_INET,&addr.sin_addr,ip_buf,sizeof(ip_buf));
         assert(msg != NULL);
-        fprintf(stderr,"server bind on %s:%d\n",msg ,SERVER_PORT);
+        fprintf(stderr,"server bind on %s:%d\n",msg ,binding_port_number);
     }
 
     if(listen(sock,1) < 0){

socket_wrapper.c

@@ -24,7 +24,7 @@ int getBufferSizeFrom(int sock){
 
 ssize_t timeout_recv(int fd,void * buf,size_t n,int timeout)
 {
-    ssize_t ret;
+    ssize_t ret = 0;
     int poll_ret;
     struct pollfd fd_single;
     fd_single.fd = fd;
@@ -32,19 +32,15 @@ ssize_t timeout_recv(int fd,void * buf,size_t n,int timeout)
     poll_ret = (poll(&fd_single,1,timeout * 1000));
     if (poll_ret < 0) return -1;
     else if(poll_ret == 0) return -2;
-    switch (fd_single.revents){
-    case POLLHUP: //We'll treat hangups state like timeouts state.
+    if (fd_single.revents & POLLHUP) //We'll treat hangups state like timeouts state.
         return -2;
-    case POLLERR:
-    case POLLNVAL:
+    if ((fd_single.revents & POLLERR) || (fd_single.revents & POLLNVAL))
         return -1;
-    case POLL_IN:
+    if (fd_single.revents & POLL_IN)
         ret = recv(fd,buf,n,0);
         assert(ret != 0);
         return ret;
-    default:
-        assert(0 && "unreachable");
-    }
+    
     assert(0 && "unreachable");
 }