X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Fosfunctions.h;h=5527127446fc6333fdc1498d0971b7a0d253dce4;hp=cd1ea34089d736dc66173755b8a0a5b869f25859;hb=a5f239e4959d4df6a4a341d8855e14d17399d671;hpb=c988f1f4faa9f679f79beddf3c14676c5dcb8e28

diff --git a/src/src/osfunctions.h b/src/src/osfunctions.h
index cd1ea3408..552712744 100644
--- a/src/src/osfunctions.h
+++ b/src/src/osfunctions.h
@@ -1,10 +1,8 @@
-/* $Cambridge: exim/src/src/osfunctions.h,v 1.2 2005/01/04 10:00:42 ph10 Exp $ */
-
 /*************************************************
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2005 */
+/* Copyright (c) University of Cambridge 1995 - 2009 */
 /* 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 +12,25 @@ that uses a type that isn't defined for them. */
 extern ip_address_item *os_common_find_running_interfaces(void);
 #endif
 
-extern int     os_getloadavg(void);
-extern void    os_restarting_signal(int, void (*)(int));
-extern void    os_non_restarting_signal(int, void (*)(int));
-extern char   *os_strexit(int);     /* char to match os_strsignal */
-extern char   *os_strsignal(int);   /* char to match strsignal in some OS */
+/* 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
 
 /* End of osfunctions.h */