stuff

Examples/ipc/MYFILE

@@ -0,0 +1 @@
+HELLO

Examples/ipc/ipcfs1.c

@@ -43,7 +43,7 @@ int main()
         wait(0);
 
         /* Read data */
-        char data[32];
+        char data[32] = {0};
         read(myfile, data, sizeof(data));
         printf("Parent received %s from child\n", data);
 

Examples/ipc/ipcmsg1.c

@@ -4,16 +4,17 @@
  *             NOTE: message queues are persistent
  */
 
+#include <mqueue.h>    // needed for mq system calls
+#include <stdio.h>     // needed for printf, perror
+#include <stdlib.h>    // needed for exit
+#include <string.h>    // needed for strcpy
 #include <sys/types.h> // needed for pid_t
 #include <sys/wait.h>  // needed for wait system call
 #include <unistd.h>    // needed for fork system call
-#include <stdlib.h>    // needed for exit
-#include <stdio.h>     // needed for printf, perror
-#include <mqueue.h>    // needed for mq system calls
-#include <string.h>    // needed for strcpy
 
 /* Struct for the queue message */
-typedef struct message {
+typedef struct message
+{
     int message_id;
     char string[10];
 } message;
@@ -29,7 +30,8 @@ int main()
 
     // Create and open a queue
     mqd_t mqdes = mq_open("/CS3841QUEUE", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR, &queue_attr);
-    if(mqdes == -1) {
+    if (mqdes == -1)
+    {
         printf("COULD NOT OPEN QUEUE\n");
         exit(EXIT_FAILURE);
     }

Examples/ipc/ipcpipe1.c

@@ -3,17 +3,18 @@
  *              a child process to a parent process
  */
 
+#include <stdio.h>     // needed for printf, perror
+#include <stdlib.h>    // needed for exit
 #include <sys/types.h> // needed for pid_t
 #include <sys/wait.h>  // needed for wait system call
 #include <unistd.h>    // needed for fork, read, write, close system calls
-#include <stdlib.h>    // needed for exit
-#include <stdio.h>     // needed for printf, perror
 
 int main()
 {
     /* Create a pipe */
     int pipefd[2];
-    if (pipe(pipefd) == -1) {
+    if (pipe(pipefd) == -1)
+    {
         perror("pipe");
         exit(EXIT_FAILURE);
     }
@@ -46,7 +47,7 @@ int main()
         close(pipefd[0]);
 
         /* Write to child */
-        write(pipefd[1], "HELLO", 5);
+        write(pipefd[1], "HELLO WORLD!", 12);
 
         /* Close pipe */
         close(pipefd[1]);

Examples/ipc/ipcpipe2.c

@@ -3,22 +3,24 @@
  *              two pipes to send data in two directions
  */
 
+#include <stdio.h>     // needed for printf, perror
+#include <stdlib.h>    // needed for exit
 #include <sys/types.h> // needed for pid_t
 #include <sys/wait.h>  // needed for wait system call
 #include <unistd.h>    // needed for fork, read, write, close system calls
-#include <stdlib.h>    // needed for exit
-#include <stdio.h>     // needed for printf, perror
 
 int main()
 {
     /* Create pipes */
     int pipe_to_child[2];
-    if (pipe(pipe_to_child) == -1) {
+    if (pipe(pipe_to_child) == -1)
+    {
         printf("PIPE FAILURE\n");
         exit(EXIT_FAILURE);
     }
     int pipe_from_child[2];
-    if (pipe(pipe_from_child) == -1) {
+    if (pipe(pipe_from_child) == -1)
+    {
         printf("PIPE FAILURE\n");
         exit(EXIT_FAILURE);
     }

Examples/ipc/ipcshm1.c

@@ -4,15 +4,15 @@
  *             NOTE: named shared memory segments are persistent
  */
 
-#include <sys/types.h> // needed for pid_t
-#include <sys/wait.h>  // needed for wait system call
 #include <fcntl.h>     // needed for parameter values for shm_open
-#include <unistd.h>    // needed for fork, getpid, getppid, kill system calls
-#include <stdlib.h>    // needed for exit
 #include <signal.h>    // needed for signal system call
 #include <stdio.h>     // needed for printf, perror
-#include <sys/mman.h>  // needed for mmap, munmap, shm system calls
+#include <stdlib.h>    // needed for exit
 #include <string.h>    // needed for strcpy
+#include <sys/mman.h>  // needed for mmap, munmap, shm system calls
+#include <sys/types.h> // needed for pid_t
+#include <sys/wait.h>  // needed for wait system call
+#include <unistd.h>    // needed for fork, getpid, getppid, kill system calls
 
 #define MAPPED_SIZE 128
 
@@ -20,7 +20,8 @@ int main()
 {
     // Create and open a shared memory segment
     int shmfd = shm_open("/CS3841MEMORY", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
-    if(shmfd == -1) {
+    if (shmfd == -1)
+    {
         printf("COULD NOT OPEN SHARED MEMORY SEGMENT\n");
         exit(EXIT_FAILURE);
     }
@@ -31,7 +32,8 @@ int main()
     // Map the segment into the processes address space
     //    NOTE: protection is set to allow reading and writing with a shared mapping
     void *mapped_space = mmap(NULL, MAPPED_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
-    if(mapped_space == MAP_FAILED) {
+    if (mapped_space == MAP_FAILED)
+    {
         printf("COULD NOT MMAP\n");
         exit(EXIT_FAILURE);
     }

Examples/ipc/ipcshm2.c

@@ -5,15 +5,15 @@
  *             NOTE: named shared memory segments are persistent
  */
 
-#include <sys/types.h> // needed for pid_t
-#include <sys/wait.h>  // needed for wait system call
 #include <fcntl.h>     // needed for parameter values for shm_open
-#include <unistd.h>    // needed for fork, getpid, getppid, kill system calls
-#include <stdlib.h>    // needed for exit
 #include <signal.h>    // needed for signal system call
 #include <stdio.h>     // needed for printf, perror
-#include <sys/mman.h>  // needed for mmap, munmap, shm system calls
+#include <stdlib.h>    // needed for exit
 #include <string.h>    // needed for strcpy
+#include <sys/mman.h>  // needed for mmap, munmap, shm system calls
+#include <sys/types.h> // needed for pid_t
+#include <sys/wait.h>  // needed for wait system call
+#include <unistd.h>    // needed for fork, getpid, getppid, kill system calls
 
 #define MAPPED_SIZE 128
 
@@ -21,7 +21,8 @@ int main()
 {
     // Create and open a shared memory segment
     int shmfd = shm_open("/CS3841MEMORY", O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
-    if(shmfd == -1) {
+    if (shmfd == -1)
+    {
         printf("COULD NOT OPEN SHARED MEMORY SEGMENT\n");
         exit(EXIT_FAILURE);
     }
@@ -32,7 +33,8 @@ int main()
     // Map the segment into the processes address space
     //    NOTE: protection is set to allow reading and writing with a shared mapping
     void *mapped_space = mmap(NULL, MAPPED_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
-    if(mapped_space == MAP_FAILED) {
+    if (mapped_space == MAP_FAILED)
+    {
         printf("COULD NOT MMAP\n");
         exit(EXIT_FAILURE);
     }
@@ -76,4 +78,3 @@ int main()
     }
     return 0; // Return success
 }
-

Examples/ipc/signal1.c

@@ -3,10 +3,10 @@
  *            for the interrupt (CTRL+C) signal
  */
 
-#include <sys/types.h> // needed for pid_t
-#include <unistd.h>    // needed for getpid, sleep system calls
 #include <signal.h>    // needed for signal system call
 #include <stdio.h>     // needed for printf
+#include <sys/types.h> // needed for pid_t
+#include <unistd.h>    // needed for getpid, sleep system calls
 
 // Signal handler
 //    Prints the PID of the process and the received signal
@@ -22,7 +22,8 @@ int main()
     signal(SIGINT, signal_handler);
 
     // Loop forever and sleep
-    while(1) {
+    while (1)
+    {
         printf("sleeping...\n");
         sleep(1);
     }

Examples/ipc/signal2.c

@@ -5,10 +5,10 @@
  *             fault and essentially loops forever
  */
 
-#include <sys/types.h> // needed for pid_t
-#include <unistd.h>    // needed for getpid, sleep system calls
 #include <signal.h>    // needed for signal system call
 #include <stdio.h>     // needed for printf
+#include <sys/types.h> // needed for pid_t
+#include <unistd.h>    // needed for getpid, sleep system calls
 
 // Signal handler
 //    Prints the PID of the process and the received signal