- Worked on OS ass3.

os/ass3/Makefile

 PROG	= fish
 
 CC		= gcc
-CFLAGS	= -std=c99 -pedantic -Wall -Wextra -O3
+CFLAGS	= -std=gnu99 -pedantic -Wall -Wextra -O3
 OFILES	= fishbones.o
 RM		= rm -f
 

os/ass3/fishbones.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
+#include <sys/wait.h>
 #include <unistd.h>
 #include <errno.h>
 #include <signal.h>
@@ -45,13 +46,12 @@ static void gup(FILE * log1, FILE * log2, int pipe_id[2], int myNumber)
 			exit(1);
 		}
 		
-		fprintf(log1, "Child %d read character '%x'\n", myNumber, c);
-		fprintf(log2, "Child %d read character '%x'\n", myNumber, c);
-		fprintf(log3, "Child %d read character '%x'\n", myNumber, c);
+		fprintf(log1, "Child %d read character %x: '%c'\n", myNumber, c, c);
+		fprintf(log2, "Child %d read character %x: '%c'\n", myNumber, c, c);
+		fprintf(log3, "Child %d read character %x: '%c'\n", myNumber, c, c);
 
-		switch( c )
-		{
-			case 'P':
+		if( c == 'P' )
+        {
 				fprintf(log1, "Child %d eats poison...", myNumber);
 				fprintf(log2, "Child %d eats poison...", myNumber);
 				fprintf(log3, "Child %d eats poison...", myNumber);
@@ -71,7 +71,9 @@ static void gup(FILE * log1, FILE * log2, int pipe_id[2], int myNumber)
 					fprintf(log3, "antidote used \n");
 				}
 				break;
-			case 'A':
+		}
+        else if( c == 'A' )
+        {
 				antidote++;
 				fprintf(log1, "Child %d finds antidote (now has %d andidote)\n",
 				        myNumber, antidote);
@@ -91,7 +93,22 @@ static void gup(FILE * log1, FILE * log2, int pipe_id[2], int myNumber)
 	exit(0);
 }
 
-#define STRING_LENGTH		(512)
+void
+signal_handler(int action)
+{
+    switch( action )
+    {
+        case SIGINT:
+            
+            break;
+        case SIGTERM:
+            
+            break;
+        case SIGCHLD:
+            
+            break;
+    }
+}
 
 int
 main(int argc, char * argv[])
@@ -100,6 +117,8 @@ main(int argc, char * argv[])
 	FILE * log2;
 	char c;
 	int kiddoCount = 0, pipe_id[2];//, i = 1;
+	struct sigaction action;
+    
 	printf("argc: %d\n", argc);
 	log1 = fopen("child.log1", "wt+");
 	log2 = fopen("child.log2", "wt+");
@@ -107,15 +126,25 @@ main(int argc, char * argv[])
 	/* So log1 is buffered; log2 is not buffered, which means that output
 	   to log2 is written immediately. */
 	
+	/* create the pipe somewhere around here (why?).
+	   remember to test for success!! */
+	
 	if( pipe(pipe_id) )
 	{
 		fprintf(stderr, "Error %d occured while createing the pipe \n", errno);
 		exit(1);
-	}
-	
-	/* create the pipe somewhere around here (why?).
-	   remember to test for success!! */
-	
+	}	
+
+    //action.sa_handler = signal_handler;
+
+    //if( sigaction(SIGINT, &action, NULL) < 0
+    //    || sigaction(SIGTERM, &action, NULL) < 0
+    //    || sigaction(SIGCHLD, &action, NULL) < 0 )
+    //{
+    //    perror("An error occured while binding the signal handlers \n");
+    //    exit(1);
+    //}
+    
 	while( (c = getchar()) )
 	{
 		/* You can now choose to use only the first character in the
@@ -131,8 +160,8 @@ main(int argc, char * argv[])
 			continue;
 		}
 		
-		fprintf(log1, "Character %x read \n", c);
-		fprintf(log2, "Character %x read \n", c);
+		fprintf(log1, "Parent read character %x: '%c'\n", c, c);
+		fprintf(log2, "Parent read character %x: '%c'\n", c, c);
 		printf("Character '%c' read \n", c);
 		
 		if( c == 'q' )
@@ -141,7 +170,7 @@ main(int argc, char * argv[])
 		}
 		else if( c == 'P' )
 		{
-			wait();
+			wait(NULL);
 		}
 		else if( c != 'f' )
 		{