Merge branch 'master' of git://git.exim.org/exim

[exim.git] / src / src / osfunctions.h

diff --git a/src/src/osfunctions.h b/src/src/osfunctions.h
index 67f7b0ebde3d5f58402d8b3706467f1ad6369c9f..14111d383b68e3cad8ca336cbd4360a10f3eae2a 100644 (file)
--- a/src/src/osfunctions.h
+++ b/src/src/osfunctions.h
@@ -14,10 +14,25 @@ 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 overriden 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 */