From: Simon Glass <sjg@chromium.org>
Date: Mon, 1 Oct 2018 17:55:08 +0000 (-0600)
Subject: sandbox: Add a way to write data to the host filesystem
X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=056a5cea3139cd41836051114a0f3344ac3d9f58;p=u-boot.git

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 1d87a53843..e7d6691b84 100644
--- 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 9e3a561b65..efa9e52d12 100644
--- 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