Revision

239

Author

gstaplin@apple.com

Date

2009-02-22 15:06:59 -0800 (Sun, 22 Feb 2009)

Log Message

This commit adds the mmap shared mapping tests I wrote.

These were used to test the validity of the GLXPixmap design.  

We may end up using a similar pattern for other things like 
shared X11 and OpenGL rendering to windows, to fix the mixed
X11 raster and OpenGL rendering problem.

Added Paths

• AppleSGLX/trunk/tests/shared_mapping/
• AppleSGLX/trunk/tests/shared_mapping/NOTES
• AppleSGLX/trunk/tests/shared_mapping/bld.sh
• AppleSGLX/trunk/tests/shared_mapping/clean.sh
• AppleSGLX/trunk/tests/shared_mapping/client.c
• AppleSGLX/trunk/tests/shared_mapping/server.c

Diff

--- AppleSGLX/trunk/tests/shared_mapping/NOTES	                        (rev 0)
+++ AppleSGLX/trunk/tests/shared_mapping/NOTES	2009-02-22 23:06:59 UTC (rev 239)
@@ -0,0 +1,8 @@
+The client and server programs are protypes to test the behavior
+of GLXPixmap shared memory in a controlled environment
+
+The client faults after munmapping and truncating its fd, but the
+server keeps going.  This is a good thing from a security perspective.
+
+The client sees the servers changes, and the server can see the
+client changes, but the server won't fault if the file is truncated.

--- AppleSGLX/trunk/tests/shared_mapping/bld.sh	                        (rev 0)
+++ AppleSGLX/trunk/tests/shared_mapping/bld.sh	2009-02-22 23:06:59 UTC (rev 239)
@@ -0,0 +1,2 @@
+gcc client.c -o client
+gcc server.c -o server

--- AppleSGLX/trunk/tests/shared_mapping/clean.sh	                        (rev 0)
+++ AppleSGLX/trunk/tests/shared_mapping/clean.sh	2009-02-22 23:06:59 UTC (rev 239)
@@ -0,0 +1 @@
+rm -f client server *~

--- AppleSGLX/trunk/tests/shared_mapping/client.c	                        (rev 0)
+++ AppleSGLX/trunk/tests/shared_mapping/client.c	2009-02-22 23:06:59 UTC (rev 239)
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+    int fd;
+    size_t length;
+    void *buffer;
+
+    fd = shm_open("FOOBAR", O_RDWR, 0);
+
+    if(-1 == fd) {
+	perror("shm_open");
+	return EXIT_FAILURE;
+    }
+
+
+    length = sysconf(_SC_PAGESIZE) * 2;
+
+    buffer = mmap(NULL, length,
+		  PROT_READ | PROT_WRITE,
+		  MAP_FILE | MAP_SHARED, fd, 0);
+    
+    if(MAP_FAILED == buffer) {
+	perror("mmap");
+	shm_unlink("FOOBAR");
+	close(fd);
+	return EXIT_FAILURE;
+    }
+    
+    while(1) {
+	unsigned char *cp, *cplimit;
+
+	cp = buffer;
+	cplimit = cp + length;
+
+	while(cp < cplimit) {
+	    printf("cp %x\n", *cp);
+	    ++cp;  
+	}
+
+	if(-1 == munmap(buffer, length))
+	    perror("munmap");
+	
+	if(-1 == ftruncate(fd, 10))
+	    perror("ftruncate");
+    }
+
+
+    return EXIT_SUCCESS;
+}

--- AppleSGLX/trunk/tests/shared_mapping/server.c	                        (rev 0)
+++ AppleSGLX/trunk/tests/shared_mapping/server.c	2009-02-22 23:06:59 UTC (rev 239)
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+    int fd;
+    size_t length;
+    void *buffer;
+    int b;
+
+    shm_unlink("FOOBAR");
+
+    fd = shm_open("FOOBAR", O_RDWR | O_EXCL | O_CREAT, 
+		  S_IRUSR | S_IWUSR | S_IROTH | S_IWOTH);
+
+    if(-1 == fd) {
+	perror("shm_open");
+	return EXIT_FAILURE;
+    }
+
+
+    length = sysconf(_SC_PAGESIZE) * 2;
+
+    if(-1 == ftruncate(fd, length)) {
+	perror("ftruncate");
+	shm_unlink("FOOBAR");
+	close(fd);
+	return EXIT_FAILURE;
+    }
+
+    printf("length %zu\n", length);
+
+    buffer = mmap(NULL, length,
+		  PROT_READ | PROT_WRITE,
+		  MAP_FILE | MAP_SHARED, fd, 0);
+    
+    if(MAP_FAILED == buffer) {
+	perror("mmap");
+	shm_unlink("FOOBAR");
+	close(fd);
+	return EXIT_FAILURE;
+    }
+    
+    b = 0;
+    while(1) {
+	printf("b %d\n", b);
+
+	memset(buffer, b, length);
+	++b;
+  
+	if(b > 255)
+	    b = 0;
+
+	sleep(1);
+    }
+
+
+    return EXIT_SUCCESS;
+}