sandbox: Add a way to write data to the host filesystem

For debugging it is sometimes useful to write out data for inspection
using an external tool. Add a function which can write this data to a
given file.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index 1d87a53..e7d6691 100644 (file)
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -106,6 +106,26 @@ void os_exit(int exit_code)
        exit(exit_code);
 }
 
+int os_write_file(const char *name, const void *buf, int size)
+{
+       char fname[256];
+       int fd;
+
+       fd = os_open(fname, OS_O_WRONLY | OS_O_CREAT | OS_O_TRUNC);
+       if (fd < 0) {
+               printf("Cannot open file '%s'\n", fname);
+               return -EIO;
+       }
+       if (os_write(fd, buf, size) != size) {
+               printf("Cannot write to file '%s'\n", fname);
+               return -EIO;
+       }
+       os_close(fd);
+       printf("Write '%s', size %#x (%d)\n", name, size, size);
+
+       return 0;
+}
+
 /* Restore tty state when we exit */
 static struct termios orig_term;
 static bool term_setup;

diff --git a/include/os.h b/include/os.h
index 9e3a561..efa9e52 100644 (file)
--- a/include/os.h
+++ b/include/os.h
@@ -347,4 +347,17 @@ void os_abort(void);
  */
 int os_mprotect_allow(void *start, size_t len);
 
+/**
+ * os_write_file() - Write a file to the host filesystem
+ *
+ * This can be useful when debugging for writing data out of sandbox for
+ * inspection by external tools.
+ *
+ * @name:      File path to write to
+ * @buf:       Data to write
+ * @size:      Size of data to write
+ * @return 0 if OK, -ve on error
+ */
+int os_write_file(const char *name, const void *buf, int size);
+
 #endif