X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fsrc%2Fosfunctions.h;h=4e6e9a91c9e86db3ece888d0ca13b897ffc91de3;hb=759502e5af0acfb310b8571f056d2dbf59adb1d3;hp=19b5808607023f77b20ac0234e78baf1893273a6;hpb=1ba28e2b955b005ce4825fec792df17f75a8de1e;p=exim.git

diff --git a/src/src/osfunctions.h b/src/src/osfunctions.h
index 19b580860..4e6e9a91c 100644
--- a/src/src/osfunctions.h
+++ b/src/src/osfunctions.h
@@ -1,10 +1,8 @@
-/* $Cambridge: exim/src/src/osfunctions.h,v 1.5 2009/11/16 19:50:37 nm4 Exp $ */
-
 /*************************************************
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Prototypes for os-specific functions. For utilities, we don't need the one
@@ -14,10 +12,31 @@ that uses a type that isn't defined for them. */
 extern ip_address_item *os_common_find_running_interfaces(void);
 #endif
 
+/* If these exist as a macro, then they're overridden away from us and we
+rely upon the system headers to provide prototype declarations for us.
+Notably, strsignal() is not in the Single Unix Specification (v3) and
+predicting constness is awkward. */
+
+#ifndef os_getloadavg
 extern int           os_getloadavg(void);
+#endif
+#ifndef os_restarting_signal
 extern void          os_restarting_signal(int, void (*)(int));
+#endif
+#ifndef os_non_restarting_signal
 extern void          os_non_restarting_signal(int, void (*)(int));
+#endif
+#ifndef os_strexit
 extern const char   *os_strexit(int);     /* char to match os_strsignal */
+#endif
+#ifndef os_strsignal
 extern const char   *os_strsignal(int);   /* char to match strsignal in some OS */
+#endif
+#ifndef os_unsetenv
+extern int           os_unsetenv(const uschar *);
+#endif
+#ifndef os_getcwd
+extern uschar       *os_getcwd(uschar *, size_t);
+#endif
 
 /* End of osfunctions.h */