extern int h_errno;
#endif
+/* We need to be careful about width of int and atomicity in signal handlers,
+especially with the rise of 64-bit systems breaking older assumptions. But
+sig_atomic_t comes from signal.h so can't go into mytypes.h without including
+signal support in local_scan, which seems precipitous. */
+typedef volatile sig_atomic_t SIGNAL_BOOL;
+
/* Now things that are present only when configured. */
#ifdef EXIM_PERL
extern uschar *dns_ipv4_lookup; /* For these domains, don't look for AAAA (or A6) */
extern int dns_retrans; /* Retransmission time setting */
extern int dns_retry; /* Number of retries */
+extern int dns_use_edns0; /* Coerce EDNS0 support on/off in resolver. */
extern uschar *dnslist_domain; /* DNS (black) list domain */
extern uschar *dnslist_matched; /* DNS (black) list matched key */
extern uschar *dnslist_text; /* DNS (black) list text message */
extern BOOL helo_verified; /* True if HELO verified */
extern BOOL helo_verify_failed; /* True if attempt failed */
extern uschar *helo_verify_hosts; /* Hard check HELO argument for these */
-extern uschar *hex_digits; /* Used in several places */
+extern const uschar *hex_digits; /* Used in several places */
extern uschar *hold_domains; /* Hold up deliveries to these */
extern BOOL host_find_failed_syntax;/* DNS syntax check failure */
extern BOOL host_checking_callout; /* TRUE if real callout wanted */
/* MIME ACL expandables */
#ifdef WITH_CONTENT_SCAN
extern int mime_anomaly_level;
-extern uschar *mime_anomaly_text;
+extern const uschar *mime_anomaly_text;
extern uschar *mime_boundary;
extern uschar *mime_charset;
extern uschar *mime_content_description;
extern address_item *sender_verified_failed; /* The one that caused denial */
extern uschar *sending_ip_address; /* Address of outgoing (SMTP) interface */
extern int sending_port; /* Port of outgoing interface */
-extern volatile BOOL sigalrm_seen; /* Flag for sigalrm_handler */
+extern SIGNAL_BOOL sigalrm_seen; /* Flag for sigalrm_handler */
extern uschar **sighup_argv; /* Args for re-execing after SIGHUP */
extern int smtp_accept_count; /* Count of connections */
extern BOOL smtp_accept_keepalive; /* Set keepalive on incoming */
extern int timeout_frozen_after; /* Max time to keep frozen messages */
extern BOOL timestamps_utc; /* Use UTC for all times */
extern int transport_count; /* Count of bytes transported */
+extern int transport_newlines; /* Accurate count of number of newline chars transported */
extern uschar **transport_filter_argv; /* For on-the-fly filtering */
extern int transport_filter_timeout; /* Timeout for same */
extern BOOL transport_filter_timed_out; /* True if it did */