mmap on AIX 7.1

Julien ÉLIE julien at trigofacile.com
Mon Sep 22 17:27:24 UTC 2014


Hi,

When building INN on AIX 7.1 with large files support, the following error occurs:

../include/portable/mmap.h:27:0: warning: "mmap" redefined
 #define mmap(s, l, p, f, d, o) (void *) mmap((s), (l), (p), (f), (d), (o))
 ^
In file included from ../include/portable/mmap.h:14:0,
                 from dbz.c:72:
/usr/include/sys/mman.h:87:0: note: this is the location of the previous definition
 #define mmap  mmap64
 ^


According to AIX documentation:
    http://www-01.ibm.com/support/knowledgecenter/#!/ssw_aix_71/com.ibm.aix.basetrf1/mmap.htm

"The mmap64 subroutine is identical to the mmap subroutine except that the starting
offset for the file mapping is specified as a 64-bit value.  This permits file
mappings which start beyond OFF_MAX.
In the large file enabled programming environment, mmap is redefined to be mmap64."




What would the best way be to fix that?


--- include/portable/mmap.h     (révision 9705)
+++ include/portable/mmap.h     (copie de travail)
@@ -24,7 +24,9 @@
 /* Solaris 8 (at least) prototypes munmap, msync, and madvise as taking char *
    (actually a caddr_t, which is a typedef for a char *) instead of void * as
    is required by the standard.  These macros add casts that silences compiler
    warnings on Solaris 8 without adversely affecting other platforms.  (ISO C
    allows macro definitions of this sort; this macro is not recursive.) */
-#define mmap(s, l, p, f, d, o) (void *) mmap((s), (l), (p), (f), (d), (o))
+#ifndef mmap
+# define mmap(s, l, p, f, d, o)       (void *) mmap((void *)(s), (l), (p), (f), (d), (o))
+#endif
 #define munmap(p, l)            munmap((void *)(p), (l))


Shouldn't (void *) also be for (s) in mmap?  (as suggested in the change)
Is the "#ifndef mmap" check enough?  At least, it works fine on AIX and
also my Debian but I wonder whether it is the right fix.

-- 
Julien ÉLIE

« Pour Rome, la direction importe peu, car tous les chemins y
  mènent. » (Astérix)


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