feat: main

hw5/include/csapp.h

@@ -0,0 +1,199 @@
+/*
+ * csapp.h - prototypes and definitions for the CS:APP3e book
+ */
+/* $begin csapp.h */
+#ifndef __CSAPP_H__
+#define __CSAPP_H__
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <dirent.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <math.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+/* Default file permissions are DEF_MODE & ~DEF_UMASK */
+/* $begin createmasks */
+#define DEF_MODE   S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH
+#define DEF_UMASK  S_IWGRP|S_IWOTH
+/* $end createmasks */
+
+/* Simplifies calls to bind(), connect(), and accept() */
+/* $begin sockaddrdef */
+typedef struct sockaddr SA;
+/* $end sockaddrdef */
+
+/* Persistent state for the robust I/O (Rio) package */
+/* $begin rio_t */
+#define RIO_BUFSIZE 8192
+typedef struct {
+    int rio_fd;                /* Descriptor for this internal buf */
+    int rio_cnt;               /* Unread bytes in internal buf */
+    char *rio_bufptr;          /* Next unread byte in internal buf */
+    char rio_buf[RIO_BUFSIZE]; /* Internal buffer */
+} rio_t;
+/* $end rio_t */
+
+/* External variables */
+extern int h_errno;    /* Defined by BIND for DNS errors */ 
+extern char **environ; /* Defined by libc */
+
+/* Misc constants */
+#define	MAXLINE	 8192  /* Max text line length */
+#define MAXBUF   8192  /* Max I/O buffer size */
+#define LISTENQ  1024  /* Second argument to listen() */
+
+/* Our own error-handling functions */
+void unix_error(char *msg);
+void posix_error(int code, char *msg);
+void dns_error(char *msg);
+// void gai_error(int code, char *msg);
+void app_error(char *msg);
+
+/* Process control wrappers */
+pid_t Fork(void);
+void Execve(const char *filename, char *const argv[], char *const envp[]);
+pid_t Wait(int *status);
+pid_t Waitpid(pid_t pid, int *iptr, int options);
+void Kill(pid_t pid, int signum);
+unsigned int Sleep(unsigned int secs);
+void Pause(void);
+unsigned int Alarm(unsigned int seconds);
+void Setpgid(pid_t pid, pid_t pgid);
+pid_t Getpgrp();
+
+/* Signal wrappers */
+typedef void handler_t(int);
+handler_t *Signal(int signum, handler_t *handler);
+void Sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
+void Sigemptyset(sigset_t *set);
+void Sigfillset(sigset_t *set);
+void Sigaddset(sigset_t *set, int signum);
+void Sigdelset(sigset_t *set, int signum);
+int Sigismember(const sigset_t *set, int signum);
+int Sigsuspend(const sigset_t *set);
+
+/* Sio (Signal-safe I/O) routines */
+ssize_t sio_puts(char s[]);
+ssize_t sio_putl(long v);
+void sio_error(char s[]);
+
+/* Sio wrappers */
+ssize_t Sio_puts(char s[]);
+ssize_t Sio_putl(long v);
+void Sio_error(char s[]);
+
+/* Unix I/O wrappers */
+int Open(const char *pathname, int flags, mode_t mode);
+ssize_t Read(int fd, void *buf, size_t count);
+ssize_t Write(int fd, const void *buf, size_t count);
+off_t Lseek(int fildes, off_t offset, int whence);
+void Close(int fd);
+int Select(int  n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 
+	   struct timeval *timeout);
+int Dup2(int fd1, int fd2);
+void Stat(const char *filename, struct stat *buf);
+void Fstat(int fd, struct stat *buf) ;
+
+/* Directory wrappers */
+DIR *Opendir(const char *name);
+struct dirent *Readdir(DIR *dirp);
+int Closedir(DIR *dirp);
+
+/* Memory mapping wrappers */
+void *Mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset);
+void Munmap(void *start, size_t length);
+
+/* Standard I/O wrappers */
+void Fclose(FILE *fp);
+FILE *Fdopen(int fd, const char *type);
+char *Fgets(char *ptr, int n, FILE *stream);
+FILE *Fopen(const char *filename, const char *mode);
+void Fputs(const char *ptr, FILE *stream);
+size_t Fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
+void Fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
+
+/* Dynamic storage allocation wrappers */
+void *Malloc(size_t size);
+void *Realloc(void *ptr, size_t size);
+void *Calloc(size_t nmemb, size_t size);
+void Free(void *ptr);
+
+/* Sockets interface wrappers */
+int Socket(int domain, int type, int protocol);
+void Setsockopt(int s, int level, int optname, const void *optval, int optlen);
+void Bind(int sockfd, struct sockaddr *my_addr, int addrlen);
+void Listen(int s, int backlog);
+int Accept(int s, struct sockaddr *addr, socklen_t *addrlen);
+void Connect(int sockfd, struct sockaddr *serv_addr, int addrlen);
+
+/* Protocol independent wrappers */
+void Getaddrinfo(const char *node, const char *service, 
+                 const struct addrinfo *hints, struct addrinfo **res);
+void Getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host, 
+                 size_t hostlen, char *serv, size_t servlen, int flags);
+void Freeaddrinfo(struct addrinfo *res);
+void Inet_ntop(int af, const void *src, char *dst, socklen_t size);
+void Inet_pton(int af, const char *src, void *dst); 
+
+/* DNS wrappers */
+struct hostent *Gethostbyname(const char *name);
+struct hostent *Gethostbyaddr(const char *addr, int len, int type);
+
+/* Pthreads thread control wrappers */
+void Pthread_create(pthread_t *tidp, pthread_attr_t *attrp, 
+		    void * (*routine)(void *), void *argp);
+void Pthread_join(pthread_t tid, void **thread_return);
+void Pthread_cancel(pthread_t tid);
+void Pthread_detach(pthread_t tid);
+void Pthread_exit(void *retval);
+pthread_t Pthread_self(void);
+void Pthread_once(pthread_once_t *once_control, void (*init_function)());
+
+/* POSIX semaphore wrappers */
+void Sem_init(sem_t *sem, int pshared, unsigned int value);
+void P(sem_t *sem);
+void V(sem_t *sem);
+
+/* Rio (Robust I/O) package */
+ssize_t rio_readn(int fd, void *usrbuf, size_t n);
+ssize_t rio_writen(int fd, void *usrbuf, size_t n);
+void rio_readinitb(rio_t *rp, int fd); 
+ssize_t	rio_readnb(rio_t *rp, void *usrbuf, size_t n);
+ssize_t	rio_readlineb(rio_t *rp, void *usrbuf, size_t maxlen);
+
+/* Wrappers for Rio package */
+ssize_t Rio_readn(int fd, void *usrbuf, size_t n);
+void Rio_writen(int fd, void *usrbuf, size_t n);
+void Rio_readinitb(rio_t *rp, int fd); 
+ssize_t Rio_readnb(rio_t *rp, void *usrbuf, size_t n);
+ssize_t Rio_readlineb(rio_t *rp, void *usrbuf, size_t maxlen);
+
+/* Reentrant protocol-independent client/server helpers */
+int open_clientfd(char *hostname, char *port);
+int open_listenfd(char *port);
+
+/* Wrappers for reentrant protocol-independent client/server helpers */
+int Open_clientfd(char *hostname, char *port);
+int Open_listenfd(char *port);
+
+
+#endif /* __CSAPP_H__ */
+/* $end csapp.h */

hw5/src/main.c

@@ -1,11 +1,11 @@
-#include <stdlib.h>
-#include <unistd.h>
-
+#define _GNU_SOURCE
 #include "pbx.h"
 #include "server.h"
 #include "debug.h"
+#include "csapp.h"
 
 static void terminate(int status);
+void sighandler(int sig);
 
 /*
  * "PBX" telephone exchange simulation.
@@ -27,10 +27,50 @@ int main(int argc, char* argv[]){
     // a SIGHUP handler, so that receipt of SIGHUP will perform a clean
     // shutdown of the server.
 
-    fprintf(stderr, "You have to finish implementing main() "
-	    "before the PBX server will function.\n");
-
+    // check arg counts and second arg valid
+    if (argc != 3 || argv[1][0] != '-' || argv[1][1] != 'p' || argv[1][2] != '\0')
+    {
+        fprintf(stderr, "Usage: ./pbx -p <port>\n");
         terminate(EXIT_FAILURE);
+    }
+
+    // check port num
+    int port = 0;
+    char* ptr = argv[2];
+    while (*ptr)
+    {
+        if (*ptr > '9' || *ptr < '0' || port > 65535)
+        {
+            fprintf(stderr, "Please provide a valid port number\n");
+            terminate(EXIT_FAILURE);
+        }
+        port *= 10;
+        port += *ptr - '0';
+        ptr ++;
+    }
+    
+    // install SIGHUP handler
+    struct sigaction act;
+    act.sa_handler = sighandler;
+    if(sigaction(SIGHUP, &act, NULL)<0)
+    {
+        fprintf(stderr, "Failed to install a SIGHUP handler");
+        terminate(EXIT_FAILURE);
+    }
+
+    // multi threading & socket connection
+    int listenfd, *connfdp;
+    socklen_t clientlen;
+    struct sockaddr_storage clientaddr;
+    pthread_t tid;
+    listenfd = Open_listenfd(argv[2]);
+    while (1) {
+        clientlen = sizeof(struct sockaddr_storage);
+        connfdp = Malloc(sizeof(int));
+        *connfdp = Accept(listenfd, (SA *) &clientaddr, &clientlen);
+        Pthread_create(&tid, NULL, (void*) pbx_client_service, connfdp);
+    }
+    terminate(EXIT_SUCCESS);
 }
 
 /*
@@ -42,3 +82,9 @@ static void terminate(int status) {
     debug("PBX server terminating");
     exit(status);
 }
+
+void sighandler(int sig)
+{
+    debug("Server turned down successfully...");
+    terminate(EXIT_SUCCESS);
+}