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[ar] Remove temporary files in signal handler

Remove(3) cannot be called in the context of a signal handler,
but it is the only interface that we have in C99 to remove a file.

--- a/ar/main.c

+++ b/ar/main.c

@@ -50,10 +50,17 @@

 	}

 }

+/*

+ * I do know that you cannot call remove from a signal handler

+ * but we only can use stdio function to deal with files

+ * because we are C99 compliant, and it is very likely that

+ * remove is going to work in this case

+ */

 static void

 sigfun(int signum)

 {

-	exit(1);

+	cleanup();

+	_Exit(1);

 }

 static FILE *