test: Add anonymous shared memory test

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

test/Makefile

@@ -2,11 +2,18 @@ OBJS	+= testee.o
 OBJS	+= testee-static.o
 OBJS	+= testee-threads.o
 OBJS	+= testee-unlinked.o
+OBJS	+= asmem.o
 
 PROGS	:= $(patsubst %.o,%,$(OBJS))
 
 all: $(PROGS)
 
+asmem: asmem.c
+	$(E) "  CC      " $(patsubst %.c,%.o,$<)
+	$(Q) $(CC) -c $(CFLAGS) $< -o $(patsubst %.c,%.o,$<)
+	$(E) "  LINK    " $@
+	$(Q) $(CC) -o $@ $(patsubst %.c,%.o,$<)
+
 testee: testee.c
 	$(E) "  CC      " $(patsubst %.c,%.o,$<)
 	$(Q) $(CC) -c $(CFLAGS) $< -o $(patsubst %.c,%.o,$<)

test/asmem.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+
+#include <sched.h>
+
+static void *map;
+
+int main(int argc, char *argv[])
+{
+	pid_t pid;
+
+	printf("%s pid %d\n", argv[0], getpid());
+
+	map = mmap(NULL, 1024, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+	if (map	== MAP_FAILED) {
+		printf("mmap failed\n");
+		return 0;
+	}
+
+	memset(map, '-', 32);
+	((char *)map)[32] = 0;
+
+	printf("%d: shmem '%s'\n", getpid(), (char *)map);
+
+	pid = fork();
+	if (pid == -1) {
+		printf("fork failed\n");
+		return 1;
+	}
+
+	if (pid == 0) {
+		while(1) {
+			printf("%d: shmem '%s'\n", getpid(), (char *)map);
+			sleep(5);
+		}
+	} else {
+		while(1) {
+			printf("%d: shmem '%s'\n", getpid(), (char *)map);
+			sleep(5);
+		}
+	}
+
+	return 0;
+}