Boilerplate for shared memory

Makefile

@@ -7,16 +7,17 @@
 
 CC = gcc
 CFLAGS = -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -D_POSIX_C_SOURCE=200809L -g -c
+LDFLAGS = -lrt -lpthread
 
 .PHONY: all clean docs docs_clean
 
 all: supervisor generator
 
 supervisor: supervisor.o
-	$(CC) $^ -o $@
+	$(CC) $(LDFLAGS) $^ -o $@
 
 generator: generator.o
-	$(CC) $^ -o $@
+	$(CC) $(LDFLAGS) $^ -o $@
 
 %.o: %.c common.h
 	$(CC) $(CFLAGS) $^

common.h

@@ -14,6 +14,7 @@
 #include <unistd.h>
 #include <assert.h>
 #include <string.h>
+#include <stdint.h>
 
 #include <errno.h>
 #include <signal.h>
@@ -33,8 +34,14 @@
 #define SEM_USED_SPACE "/sem_used_space_01527193"
 #define SEM_WRITE_END "/sem_write_end_01527193"
 
+#define MAX_ITEMS 32
+
 struct circ_buf {
-	int id;
+	int quit;
+	int head;
+	int tail;
+	int validItems;
+	int data[MAX_ITEMS];
 };
 
 #endif /* ifndef COMMON_H */