D26871.diff
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	Index: head/lib/libc/gen/err.c
	===================================================================
	--- head/lib/libc/gen/err.c
	+++ head/lib/libc/gen/err.c
	@@ -161,6 +161,9 @@
	void
	vwarnc(int code, const char *fmt, va_list ap)
	{
	+ static int saved_errno;
	+
	+ saved_errno = errno;
	if (err_file == NULL)
	err_set_file(NULL);
	fprintf(err_file, "%s: ", _getprogname());
	@@ -169,6 +172,7 @@
	fprintf(err_file, ": ");
	}
	fprintf(err_file, "%s\n", strerror(code));
	+ errno = saved_errno;
	}

	void
	@@ -183,10 +187,14 @@
	void
	vwarnx(const char *fmt, va_list ap)
	{
	+ static int saved_errno;
	+
	+ saved_errno = errno;
	if (err_file == NULL)
	err_set_file(NULL);
	fprintf(err_file, "%s: ", _getprogname());
	if (fmt != NULL)
	vfprintf(err_file, fmt, ap);
	fprintf(err_file, "\n");
	+ errno = saved_errno;
	}