added sock20

TMP/Practice/04.10/shmat/svshm_string.h

@@ -1,60 +1,26 @@
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/sem.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <unistd.h>
+#include <string.h>
 
-static void
-usage(const char *pname)
-{
-    fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
-            pname);
-    fprintf(stderr, "    -c           Use IPC_CREAT flag\n");
-    fprintf(stderr, "    -x           Use IPC_EXCL flag\n");
-    exit(EXIT_FAILURE);
-}
+#define errExit(msg)        \
+    do                      \
+    {                       \
+        perror(msg);        \
+        exit(EXIT_FAILURE); \
+    } while (0)
 
-int main(int argc, char *argv[])
-{
-    int semid, nsems, flags, opt;
-    key_t key;
+union semun
+{ /* Used in calls to semctl() */
+    int val;
+    struct semid_ds *buf;
+    unsigned short *array;
+#if defined(__linux__)
+    struct seminfo *__buf;
+#endif
+};
 
-    flags = 0;
-    while ((opt = getopt(argc, argv, "cx")) != -1)
-    {
-        switch (opt)
-        {
-        case 'c':
-            flags |= IPC_CREAT;
-            break;
-        case 'x':
-            flags |= IPC_EXCL;
-            break;
-        default:
-            usage(argv[0]);
-        }
-    }
-
-    if (argc != optind + 3)
-        usage(argv[0]);
-
-    key = ftok(argv[optind], argv[optind + 1][0]);
-    if (key == -1)
-    {
-        perror("ftok");
-        exit(EXIT_FAILURE);
-    }
-
-    nsems = atoi(argv[optind + 2]);
-
-    semid = semget(key, nsems, flags | 0600);
-    if (semid == -1)
-    {
-        perror("semget");
-        exit(EXIT_FAILURE);
-    }
-
-    printf("ID = %d\n", semid);
-
-    exit(EXIT_SUCCESS);
-}
+#define MEM_SIZE 4096

TMP/Practice/04.10/shmat/svshm_string_read.c

@@ -2,59 +2,61 @@
 #include <stdlib.h>
 #include <sys/ipc.h>
 #include <sys/sem.h>
-#include <unistd.h>
+#include <sys/shm.h>
 
-static void
-usage(const char *pname)
+#include "svshm_string.h"
+
+int main(void)
 {
-    fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
-            pname);
-    fprintf(stderr, "    -c           Use IPC_CREAT flag\n");
-    fprintf(stderr, "    -x           Use IPC_EXCL flag\n");
-    exit(EXIT_FAILURE);
-}
+    int semid, shmid;
+    char *addr;
+    union semun arg, dummy;
+    struct sembuf sop;
 
-int main(int argc, char *argv[])
-{
-    int semid, nsems, flags, opt;
-    key_t key;
+    /* Create shared memory and semaphore set containing one
+       semaphore. */
 
-    flags = 0;
-    while ((opt = getopt(argc, argv, "cx")) != -1)
-    {
-        switch (opt)
-        {
-        case 'c':
-            flags |= IPC_CREAT;
-            break;
-        case 'x':
-            flags |= IPC_EXCL;
-            break;
-        default:
-            usage(argv[0]);
-        }
-    }
+    shmid = shmget(IPC_PRIVATE, MEM_SIZE, IPC_CREAT | 0600);
+    if (shmid == -1)
+        errExit("shmget");
 
-    if (argc != optind + 3)
-        usage(argv[0]);
-
-    key = ftok(argv[optind], argv[optind + 1][0]);
-    if (key == -1)
-    {
-        perror("ftok");
-        exit(EXIT_FAILURE);
-    }
-
-    nsems = atoi(argv[optind + 2]);
-
-    semid = semget(key, nsems, flags | 0600);
+    semid = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
     if (semid == -1)
-    {
-        perror("semget");
-        exit(EXIT_FAILURE);
-    }
+        errExit("semget");
 
-    printf("ID = %d\n", semid);
+    /* Attach shared memory into our address space. */
+
+    addr = shmat(shmid, NULL, SHM_RDONLY);
+    if (addr == (void *)-1)
+        errExit("shmat");
+
+    /* Initialize semaphore 0 in set with value 1. */
+
+    arg.val = 1;
+    if (semctl(semid, 0, SETVAL, arg) == -1)
+        errExit("semctl");
+
+    printf("shmid = %d; semid = %d\n", shmid, semid);
+
+    /* Wait for semaphore value to become 0. */
+
+    sop.sem_num = 0;
+    sop.sem_op = 0;
+    sop.sem_flg = 0;
+
+    if (semop(semid, &sop, 1) == -1)
+        errExit("semop");
+
+    /* Print the string from shared memory. */
+
+    printf("%s\n", addr);
+
+    /* Remove shared memory and semaphore set. */
+
+    if (shmctl(shmid, IPC_RMID, NULL) == -1)
+        errExit("shmctl");
+    if (semctl(semid, 0, IPC_RMID, dummy) == -1)
+        errExit("semctl");
 
     exit(EXIT_SUCCESS);
 }

TMP/Practice/04.10/shmat/svshm_string_write.c

@@ -1,60 +1,53 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/ipc.h>
+#include <string.h>
 #include <sys/sem.h>
-#include <unistd.h>
+#include <sys/shm.h>
 
-static void
-usage(const char *pname)
-{
-    fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
-            pname);
-    fprintf(stderr, "    -c           Use IPC_CREAT flag\n");
-    fprintf(stderr, "    -x           Use IPC_EXCL flag\n");
-    exit(EXIT_FAILURE);
-}
+#include "svshm_string.h"
 
 int main(int argc, char *argv[])
 {
-    int semid, nsems, flags, opt;
-    key_t key;
+    int semid, shmid;
+    char *addr;
+    size_t len;
+    struct sembuf sop;
 
-    flags = 0;
-    while ((opt = getopt(argc, argv, "cx")) != -1)
+    if (argc != 4)
     {
-        switch (opt)
-        {
-        case 'c':
-            flags |= IPC_CREAT;
-            break;
-        case 'x':
-            flags |= IPC_EXCL;
-            break;
-        default:
-            usage(argv[0]);
-        }
-    }
-
-    if (argc != optind + 3)
-        usage(argv[0]);
-
-    key = ftok(argv[optind], argv[optind + 1][0]);
-    if (key == -1)
-    {
-        perror("ftok");
+        fprintf(stderr, "Usage: %s shmid semid string\n", argv[0]);
         exit(EXIT_FAILURE);
     }
 
-    nsems = atoi(argv[optind + 2]);
-
-    semid = semget(key, nsems, flags | 0600);
-    if (semid == -1)
+    len = strlen(argv[3]) + 1; /* +1 to include trailing '\0' */
+    if (len > MEM_SIZE)
     {
-        perror("semget");
+        fprintf(stderr, "String is too big!\n");
         exit(EXIT_FAILURE);
     }
 
-    printf("ID = %d\n", semid);
+    /* Get object IDs from command-line. */
+    if((key = ftok("bin/sh", 'A')) = -1) errExit
+    shmid = atoi(argv[1]);
+    semid = atoi(argv[2]);
+
+    /* Attach shared memory into our address space and copy string
+       (including trailing null byte) into memory. */
+
+    addr = shmat(shmid, NULL, 0);
+    if (addr == (void *)-1)
+        errExit("shmat");
+
+    memcpy(addr, argv[3], len);
+
+    /* Decrement semaphore to 0. */
+
+    sop.sem_num = 0;
+    sop.sem_op = -1;
+    sop.sem_flg = 0;
+
+    if (semop(semid, &sop, 1) == -1)
+        errExit("semop");
 
     exit(EXIT_SUCCESS);
 }

TMP/Practice/sock20.10.23/c3.c

@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <time.h>
+
+#define SERVER_PATH "/tmp/unix_sock.server"
+#define CLIENT_PATH "unix_sock.client"
+#define DATA "Hello from client"
+#define BUF 128
+
+int main(int argc,char *argv[]){
+
+    int client_sock, rc, len;
+    struct sockaddr_un server_sockaddr; 
+    struct sockaddr_un client_sockaddr; 
+    char buf[BUF];
+    size_t bs=BUF;
+    char cpath[22];
+
+    srand(time(NULL));
+    sprintf(cpath,"%03d-%s",rand()%1000,CLIENT_PATH); 
+    len = sizeof(client_sockaddr);
+    memset(&server_sockaddr, 0, sizeof(struct sockaddr_un));
+    memset(&client_sockaddr, 0, sizeof(struct sockaddr_un));
+     
+    client_sock = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (client_sock == -1) {
+        perror("socket");
+        exit(1);
+    }
+
+
+    client_sockaddr.sun_family = AF_UNIX;   
+    strcpy(client_sockaddr.sun_path, cpath); 
+    
+    unlink(cpath);
+    rc = bind(client_sock, (struct sockaddr *) &client_sockaddr, len);
+    if (rc == -1){
+        perror("bind");
+        close(client_sock);
+        exit(1);
+    }
+        
+    server_sockaddr.sun_family = AF_UNIX;
+    strcpy(server_sockaddr.sun_path, SERVER_PATH);
+    rc = connect(client_sock, (struct sockaddr *) &server_sockaddr, len);
+    if(rc == -1){
+        perror("connect");
+        close(client_sock);
+        exit(1);
+    }
+    
+    if (argc > 1) 
+       strcpy(buf, argv[1]);
+    else    
+       strcpy(buf, DATA);                 
+
+    printf("Sending data...\n");
+    rc = send(client_sock, buf, strlen(buf), 0);
+    if (rc == -1) {
+        perror("send");
+        close(client_sock);
+        exit(1);
+    }   
+    else {
+        printf("Data sent!\n");
+    }
+
+    printf("Waiting to recieve data...\n");
+    memset(buf, 0, sizeof(buf));
+    rc = recv(client_sock, buf, bs,0);
+    if (rc == -1) {
+        perror("recv");
+        close(client_sock);
+        exit(1);
+    }   
+    else {
+        printf("DATA RECEIVED = %s\n", buf);
+    }
+    
+    close(client_sock);
+    unlink(cpath);
+    
+    return 0;
+}

TMP/Practice/sock20.10.23/c4.c

@@ -0,0 +1,142 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <time.h>
+
+#define errExit(msg)       do { perror(msg); _exit(EXIT_FAILURE); } while (0)
+#define SerrExit(s,msg)    do { close(s); perror(msg); _exit(EXIT_FAILURE); } while (0)
+
+#define SERVER_PATH "/tmp/unix_sock.server"
+#define CLIENT_PATH "unix_sock.client"
+#define DATA "Hello from client"
+#define BUF 128
+#define FINS "exit_s"
+#define FINC "exit_c"
+//#define INFO 
+
+int rcvBuffer(int sock_fd){
+      int rcvBufferSize;
+      socklen_t sockOptSize = sizeof(rcvBufferSize);
+      getsockopt(sock_fd, SOL_SOCKET, SO_RCVBUF, &rcvBufferSize, &sockOptSize);
+#ifdef INFO
+      printf("initial socket receive buf %d\n", rcvBufferSize);
+#endif
+      return rcvBufferSize;
+}
+
+int recvCount(const void *s, int size){
+   register int count;
+   register int mark;
+   register char *p;
+   p=(char *)s;
+   count = 0;
+   mark = 0;
+   do {
+     if (*p && !(*(p+1))) count++;
+#ifdef INFO
+     printf("[%c][%X]\n",*p,*p);
+#endif
+     p++;
+     mark++;
+   } while (!((*p == '\0') && (*(p+1)=='\0')) && (mark < size));
+   return count;
+}
+
+int main(int argc,char *argv[]){
+
+    int client_sock, rc, len;
+    struct sockaddr_un server_sockaddr; 
+    struct sockaddr_un client_sockaddr; 
+    char obuf[BUF];
+    char **ibuf;
+    size_t obs=BUF,ibs;
+    char cpath[22];
+
+    sprintf(cpath,"%d-%s",getpid(),CLIENT_PATH); 
+    len = sizeof(client_sockaddr);
+    memset(&server_sockaddr, 0, sizeof(struct sockaddr_un));
+    memset(&client_sockaddr, 0, sizeof(struct sockaddr_un));
+     
+    client_sock = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (client_sock == -1) {
+        perror("socket");
+        exit(1);
+    }
+
+
+    client_sockaddr.sun_family = AF_UNIX;   
+    strcpy(client_sockaddr.sun_path, cpath); 
+    
+    unlink(cpath);
+    rc = bind(client_sock, (struct sockaddr *) &client_sockaddr, len);
+    if (rc == -1) SerrExit(client_sock,"bind");
+
+    server_sockaddr.sun_family = AF_UNIX;
+    strcpy(server_sockaddr.sun_path, SERVER_PATH);
+    rc = connect(client_sock, (struct sockaddr *) &server_sockaddr, len);
+    if (rc == -1) SerrExit(client_sock,"connect");
+    
+    ibs=rcvBuffer(client_sock);
+    if ((ibuf=(char **)malloc(ibs)) == NULL ) errExit("malloc");
+
+    do {
+      memset(obuf, 0, obs);
+       printf("> ");
+      scanf("%s",obuf);
+
+      printf("Sending data...\n");
+      rc = send(client_sock, obuf, strlen(obuf)+1, 0);
+      if (rc == -1) {
+         perror("send");
+         close(client_sock);
+         exit(1);
+      } else {
+        printf("Data sent!\n");
+      }
+
+      printf("Waiting to recieve data...\n");
+      memset(ibuf, 0, ibs);
+      rc = recv(client_sock, ibuf, ibs,0);
+      if (rc == -1) {
+         perror("recv");
+         close(client_sock);
+         exit(1);
+      } else {
+        int c = recvCount(ibuf,ibs);
+#ifdef INFO
+        char *p = (char *)ibuf;
+        printf("count: %d resieved\n",c);
+        for (int i = 0; i < 32; i++){
+           printf("[%c][%X]",*p,*p);
+           p++;
+        }
+        printf("\n");
+#endif
+#ifndef INFO
+        char p[obs];
+        char *tp = (char *)ibuf;
+//        if ((ibuf=(char **)malloc(ibs)) == NULL ) errExit("malloc");
+        for (int i = 0; i < c; i++){
+           memset(p,0,obs);
+           while (*tp) {strncat(p,tp,1);tp++;}
+           tp++;
+//           printf("DATA RECEIVED [%ld] = %s\n", strlen(ibuf[i]),ibuf[i]);
+           printf("DATA RECEIVED [%ld] = %s\n", strlen(p),p);
+//           printf("DATA RECEIVED [%ld] = %s\n", strlen(p[i]),p[i]);
+        }
+#endif
+      }
+      
+    } while (strcmp(obuf,FINC) && strcmp(obuf,FINS));
+
+    close(client_sock);
+    unlink(cpath);
+    
+    return 0;
+}

TMP/Practice/sock20.10.23/s3.c

@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#define errExit(msg)    do { perror(msg); _exit(EXIT_FAILURE); } while (0)
+
+#define SOCK_PATH  "/tmp/unix_sock.server"
+#define DATA "Hello from server"
+#define BUF 128
+#define FIN "exit"
+
+int session(int client_sock, struct sockaddr_un server_sockaddr, struct sockaddr_un client_sockaddr){     
+ int rc;
+ char inbuf[BUF];
+ char outbuf[BUF];
+ int bytes_rec = 0;
+ size_t bs = BUF;
+ socklen_t len;
+   len = sizeof(client_sockaddr);
+   rc = getpeername(client_sock, (struct sockaddr *) &client_sockaddr, &len);
+   if (rc == -1){
+      close(client_sock);
+      errExit("getpeer");
+   } else {
+      printf("Client socket filepath: %s\n", client_sockaddr.sun_path);
+   }
+    
+   printf("waiting to read...\n");
+   memset(inbuf, 0, bs);                
+   bytes_rec = recv(client_sock, inbuf, bs, 0);
+   if (bytes_rec == -1){
+      close(client_sock);
+      errExit("recv");
+   } else {
+      printf("DATA RECEIVED = %s\n", inbuf);
+   }
+    
+   memset(outbuf, 0, bs);
+   strcpy(outbuf, DATA);      
+   printf("Sending data...\n");
+   rc = send(client_sock, outbuf, strlen(outbuf), 0);
+   if (rc == -1) {
+      close(client_sock);
+      errExit("send");
+   } else {
+      printf("Data sent!\n");
+   }
+   close(client_sock);
+   return strcmp(inbuf,FIN);
+}
+
+
+int main(void){
+
+ int server_sock, client_sock, rc;
+ socklen_t len;
+ struct sockaddr_un server_sockaddr;
+ struct sockaddr_un client_sockaddr;     
+ int backlog = 10;
+
+ len = sizeof(server_sockaddr);
+ memset(&server_sockaddr, 0, sizeof(struct sockaddr_un));
+ memset(&client_sockaddr, 0, sizeof(struct sockaddr_un));
+    
+ server_sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (server_sock == -1) errExit("socket");
+    
+ server_sockaddr.sun_family = AF_UNIX;   
+ strcpy(server_sockaddr.sun_path, SOCK_PATH); 
+    
+ unlink(SOCK_PATH);
+ rc = bind(server_sock, (struct sockaddr *) &server_sockaddr, len);
+ if (rc == -1){
+    close(server_sock);
+    errExit("bind");
+ }
+    
+ rc = listen(server_sock, backlog);
+ if (rc == -1){
+    close(server_sock);
+    errExit("listen");
+ }
+
+ printf("socket listening...\n");
+
+ do {
+   client_sock = accept(server_sock, (struct sockaddr *) &client_sockaddr, &len);
+   if (client_sock == -1){
+      close(server_sock);
+      close(client_sock);
+      errExit("accept");
+   }
+ } while (session(client_sock,server_sockaddr,client_sockaddr));
+   
+
+ close(server_sock);
+ unlink(SOCK_PATH);
+    
+ return 0;
+}

TMP/Practice/sock20.10.23/s4.c

@@ -0,0 +1,142 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <error.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+
+#define errExit(msg)    do { perror(msg); _exit(EXIT_FAILURE); } while (0)
+
+#define SOCK_PATH  "/tmp/unix_sock.server"
+#define DATA "Hello from server"
+#define BUF 128
+#define FINS "exit_s"
+#define FINC "exit_c"
+
+void child_handler(int sig) {
+    pid_t pid;
+    while((pid = waitpid(-1, NULL, WNOHANG)) > 0);
+}
+
+void session(int client_sock, struct sockaddr_un server_sockaddr, struct sockaddr_un client_sockaddr){     
+ int rc;
+ char inbuf[BUF];
+ char outbuf[BUF];
+ int bytes_rec = 0;
+ size_t bs = BUF;
+ socklen_t len;
+ pid_t ppid, pid;
+
+ ppid=getppid();
+ pid=getpid();
+
+   len = sizeof(client_sockaddr);
+   rc = getpeername(client_sock, (struct sockaddr *) &client_sockaddr, &len);
+   if (rc == -1){
+      close(client_sock);
+      errExit("getpeer");
+   } else {
+      printf("[%d] Client socket filepath: %s\n", pid, client_sockaddr.sun_path);
+   }
+   do { 
+     printf("waiting for %s...\n",client_sockaddr.sun_path);
+     memset(inbuf, 0, bs);                
+     bytes_rec = recv(client_sock, inbuf, bs, 0);
+     if (bytes_rec == -1){
+        close(client_sock);
+        errExit("recv");
+     } else {
+      printf("[%s]:  %s\n", client_sockaddr.sun_path, inbuf);
+     }
+    
+     memset(outbuf, 0, bs);
+     strcpy(outbuf, DATA);      
+     printf("Sending data...\n");
+     rc = send(client_sock, outbuf, strlen(outbuf)+1, 0);
+     if (rc == -1) {
+        close(client_sock);
+        errExit("send");
+     } else {
+        printf("Data sent!\n");
+     }
+     if (strcmp(inbuf,FINS) == 0 ) {kill(ppid,SIGTERM);break;}
+   } while (strcmp(inbuf,FINC));
+   memset(outbuf, 0, bs);
+   sprintf(outbuf,"Exit %d\n",pid);      
+   rc = send(client_sock, outbuf, strlen(outbuf)+1, 0);
+   if (rc == -1) {
+      close(client_sock);
+      errExit("send");
+   } 
+   close(client_sock);
+   exit(0);
+}
+
+int main(void){
+
+ int server_sock, client_sock, rc;
+ socklen_t len;
+ struct sockaddr_un server_sockaddr;
+ struct sockaddr_un client_sockaddr;     
+ int backlog = 10;
+ pid_t pid;
+
+ struct sigaction new_act, old_act;
+ sigemptyset (&new_act.sa_mask);
+ new_act.sa_flags = SA_RESTART;
+ new_act.sa_handler = child_handler;
+ sigaction (SIGCHLD, &new_act, &old_act);
+
+ len = sizeof(server_sockaddr);
+ memset(&server_sockaddr, 0, sizeof(struct sockaddr_un));
+ memset(&client_sockaddr, 0, sizeof(struct sockaddr_un));
+    
+ server_sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (server_sock == -1) errExit("socket");
+    
+ server_sockaddr.sun_family = AF_UNIX;   
+ strcpy(server_sockaddr.sun_path, SOCK_PATH); 
+    
+ unlink(SOCK_PATH);
+ rc = bind(server_sock, (struct sockaddr *) &server_sockaddr, len);
+ if (rc == -1){
+    close(server_sock);
+    errExit("bind");
+ }
+    
+ rc = listen(server_sock, backlog);
+ if (rc == -1){
+    close(server_sock);
+    errExit("listen");
+ }
+
+ printf("socket listening...\n");
+
+ do {
+   client_sock = accept(server_sock, (struct sockaddr *) &client_sockaddr, &len);
+   if (client_sock == -1){
+      close(server_sock);
+      close(client_sock);
+      errExit("accept");
+   }
+   if ((pid = fork()) == -1 ) {
+      close(server_sock);
+      close(client_sock);
+      errExit("fork");
+   }
+   if (pid == 0) session(client_sock,server_sockaddr,client_sockaddr);
+   close(client_sock);
+ } while (1);
+   
+
+ close(server_sock);
+ unlink(SOCK_PATH);
+    
+ return 0;
+}