it works! :)

[moctel.git] / show_ioctl.c

diff --git a/show_ioctl.c b/show_ioctl.c
new file mode 100644 (file)
index 0000000..e090d9a
--- /dev/null
+++ b/show_ioctl.c
@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/ioctl.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+struct fetch_fops_args {
+  int fd;
+  uint64_t retp;
+};
+
+#define MOCTEL_FETCH_FOPS _IOR('m', 1, struct fetch_fops_args)
+
+struct file_operations {
+        void *owner;
+        void *llseek;
+        void *read;
+        void *write;
+        void *aio_read;
+        void *aio_write;
+        void *readdir;
+        void *poll;
+        void *unlocked_ioctl;
+        void *compat_ioctl;
+        void *mmap;
+        void *open;
+        void *flush;
+        void *release;
+        void *fsync;
+        void *aio_fsync;
+        void *fasync;
+        void *lock;
+        void *sendpage;
+        void *get_unmapped_area;
+        void *check_flags;
+        void *flock;
+        void *splice_write;
+        void *splice_read;
+        void *setlease;
+        void *fallocate;
+};
+
+
+
+int main(int argc, char **argv) {
+  if (argc != 2) fputs("Usage: show_ioctl <device>\n", stderr), exit(1);
+
+  char *devname = argv[1];
+  int devfd = open(devname, O_RDONLY);
+  if (devfd == -1) fprintf(stderr, "Can't open %s: %m\n", devname), exit(1);
+
+  int ioctlfd = open("/dev/ioctl_info", O_RDONLY);
+  if (ioctlfd == -1) fprintf(stderr, "Can't open /dev/ioctl_info: %m\n"), exit(1);
+
+  struct file_operations fops;
+  struct fetch_fops_args ioctl_args = {
+    .fd = devfd,
+    .retp = (uint64_t)&fops
+  };
+  int ret = ioctl(ioctlfd, MOCTEL_FETCH_FOPS, &ioctl_args);
+  if (ret) fprintf(stderr, "can't perform MOCTEL_FETCH_FOPS: %m\n"), exit(1);
+
+  close(ioctlfd);
+  close(devfd);
+
+  printf("unlocked_ioctl: %llx\n", (unsigned long long)fops.unlocked_ioctl);
+
+  return 0;
+}