Test removal of a file when it is open in an application

A `cp temp-file-read{.bak,}` is required for the program to work.

remove_file_while_open.c

@@ -0,0 +1,47 @@
+/**
+ * Program to test what happens when a file is deleted
+ * externally when it is opened in the program.
+ *
+ * In general this test tries to validate the fact that,
+ *
+ *   Applications continue to have access to their open
+ *   files even if they are removed externally by some
+ *   means.
+ *
+ * In GNU/Linux, this seems to be true.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+char read_ch(FILE *fp)
+{
+	char ch;
+	if (fread (&ch, 1, 1, fp))
+	{
+		return ch;
+	}
+
+	return 0;
+}
+
+int main(void)
+{
+	char *read_file = "temp-file-read";
+	FILE *read_fp = fopen (read_file, "r");
+	if (read_fp != NULL)
+	{
+		printf ("First character: %c\n", read_ch(read_fp));
+
+		/* remove the file and wait for some time */
+		remove (read_file);
+		sleep(120);
+
+		fseek (read_fp, -2L, SEEK_END);
+		printf ("Second character: %c\n", read_ch(read_fp));
+	}
+	else
+	{
+		printf ("File '%s' missing.\n", read_file);
+	}
+}