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Examples/ipc/README.md

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+# Inter-process communication (IPC) examples
+
+CS3841 examples using IPC mechanisms to communicate between processes
+
+* ipcfs1.c - Using the file system for inter-process communication  
+Shows a problem with the fact that the file position pointer is shared between parent and childUsing fork to create two processes
+
+* ipcfs2.c - Using the file system for inter-process communication  
+Fixes the file position pointer problem in ipcfs1.c by using lseek to reset the pointer to the beginning  
+Shows the frustration with using the file system for IPC by needing to move the file position pointer around
+
+* ipcpipe1.c - Using a pipe to communicate data from a child process to a parent process
+
+* ipcpipe2.c - Pipes are unidirectional and require two pipes to send data in two directions
+
+* ipcmsg1.c - Using a message queue to send data from a parent process to a child process  
+NOTE: message queues are persistent
+
+* ipcmsg2.c - ses message queues to send multiple messages between two processes  
+Shows what can happen with blocking queues when the queue gets full  
+NOTE: message queues are persistent
+
+* signal1.c - Shows how to set up a signal handler for the interrupt (CTRL+C) signal
+
+* signal2.c - Shows how to set up a signal handler for the segmentation fault signal  
+Unfortunately does not fix the segmentation fault and essentially loops forever
+
+* ipcsignal.c - Shows how to use the kill system call to send a signal from one process to another
+
+* ipcshm1.c - Uses shared memory to send data from a child process to a parent process  
+NOTE: named shared memory segments are persistent
+
+* ipcshm2.c - Uses shared memory to send data from a child process to a parent process  
+Uses shm\_unlink to remove the shared memory when done  
+NOTE: named shared memory segments are persistent