-/* $Cambridge: exim/src/OS/os.h-Linux,v 1.3 2005/02/17 10:04:41 ph10 Exp $ */
-
/* Exim: OS-specific C header file for Linux */
+/* Some old systems we've received bug-reports for have a <limits.h> which
+does not pull in <features.h>. Best to just pull it in now and have done
+with the issue. */
+
+#include <features.h>
+
+
#define CRYPT_H
#define GLIBC_IP_OPTIONS
#define HAVE_MMAP
#define NO_IP_VAR_H
#define SIG_IGN_WORKS
+/* When using the DKIM, setting HAVE_LINUX_SENDFILE can increase
+performance on outgoing mail a bit. Note: With older glibc versions
+this setting will conflict with the _FILE_OFFSET_BITS=64 setting
+defined as part of the Linux CFLAGS. */
+
+/* #define HAVE_LINUX_SENDFILE */
+
#define F_FREESP O_TRUNC
typedef struct flock flock_t;