1 files changed, 102 insertions, 0 deletions
diff --git a/tests/memory/memfd_create/t_memfd_create.c b/tests/memory/memfd_create/t_memfd_create.c
new file mode 100644
index 000000000..73d641a6e
--- /dev/null
+++ b/tests/memory/memfd_create/t_memfd_create.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+#include <linux/memfd.h>
+#include <linux/fcntl.h>
+#include <sys/syscall.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+#define errExit(msg)    do { perror(msg); exit(EXIT_FAILURE); \
+} while (0)
+
+int main(int argc, char *argv[])
+{
+	int fd;
+	unsigned int seals;
+	char *addr;
+	char *name, *seals_arg;
+	ssize_t len;
+	char* message = "this is a test message for memfd\n";
+
+	if (argc < 3) {
+		fprintf(stderr, "%s name size [seals]\n", argv[0]);
+		fprintf(stderr, "\t'seals' can contain any of the "
+				"following characters:\n");
+		fprintf(stderr, "\t\tg - F_SEAL_GROW\n");
+		fprintf(stderr, "\t\ts - F_SEAL_SHRINK\n");
+		fprintf(stderr, "\t\tw - F_SEAL_WRITE\n");
+		fprintf(stderr, "\t\tS - F_SEAL_SEAL\n");
+		exit(EXIT_FAILURE);
+	}
+
+	name = argv[1];
+	len = atoi(argv[2]);
+	seals_arg = argv[3];
+
+	/* Create an anonymous file in tmpfs; allow seals to be
+	   placed on the file */
+
+	fd = syscall(SYS_memfd_create, name, MFD_ALLOW_SEALING);
+	if (fd == -1)
+		errExit("memfd_create");
+
+	/* Size the file as specified on the command line */
+
+	if (ftruncate(fd, len) == -1)
+		errExit("truncate");
+
+	if (write(fd, message, strlen(message)) <= 0)
+		errExit("write");
+
+	//printf("PID: %ld; fd: %d; /proc/%ld/fd/%d\n",
+	//        (long) getpid(), fd, (long) getpid(), fd);
+	printf("/proc/%ld/fd/%d\n", (long) getpid(), fd);
+
+	/* Code to map the file and populate the mapping with data
+	   omitted */
+
+	/* If a 'seals' command-line argument was supplied, set some
+	   seals on the file */
+
+	if (seals_arg != NULL) {
+		seals = 0;
+
+		if (strchr(seals_arg, 'g') != NULL)
+			seals |= F_SEAL_GROW;
+		if (strchr(seals_arg, 's') != NULL)
+			seals |= F_SEAL_SHRINK;
+		if (strchr(seals_arg, 'w') != NULL)
+			seals |= F_SEAL_WRITE;
+		if (strchr(seals_arg, 'S') != NULL)
+			seals |= F_SEAL_SEAL;
+
+		if (fcntl(fd, F_ADD_SEALS, seals) == -1)
+			errExit("fcntl");
+	}
+
+	/* Keep running, so that the file created by memfd_create()
+	   continues to exist */
+
+	pause();
+
+	exit(EXIT_SUCCESS);
+}
+