On Fri, Jul 11, 2014 at 05:46:15AM +0000, Doug Hogan wrote: > I don't think the current man page has enough detail for what the > malloc.conf settings do. > > > Index: lib/libc/stdlib/malloc.3 > =================================================================== > RCS file: /cvs/src/lib/libc/stdlib/malloc.3,v > retrieving revision 1.78 > diff -u -p -d -r1.78 malloc.3 > --- lib/libc/stdlib/malloc.3 1 May 2014 18:41:59 -0000 1.78 > +++ lib/libc/stdlib/malloc.3 11 Jul 2014 04:30:37 -0000 > @@ -220,10 +220,16 @@ Malloc will first look for a symbolic li > .Pa /etc/malloc.conf > and next check the environment for a variable called > .Ev MALLOC_OPTIONS > +(if not > +.Xr issetugid 2 ) > and finally for the global variable > .Va malloc_options > and scan them for flags in that order. > Flags are single letters, uppercase means on, lowercase means off. > +
you want .Pp instead of a blank line > +The default flags are 'AP', small chunks are always junked, and the first > +part of the pages is junked after free. The default junk behavior does not new sentences start on new lines > +correspond to 'j' or 'J'. > .Bl -tag -width indent > .It Cm A > .Dq Abort . > @@ -270,7 +276,7 @@ Fill some junk into the area allocated. > Currently junk is bytes of 0xd0 when allocating; this is pronounced > .Dq Duh . > \&:-) > -Freed chunks are filled with 0xdf. > +Freed chunks are filled with 0xdf. This performs more junking than by > default. ditto > .It Cm j > .Dq Don't Junk . > By default, small chunks are always junked, and the first part of pages > @@ -297,6 +303,7 @@ This can substantially aid in compacting > .\"Consult the source for this one. > .It Cm S > Enable all options suitable for security auditing. > +This currently enables flags 'UJG' and sets the free cache page size to 0. > .It Cm U > .Dq Free unmap . > Enable use after free protection for larger allocations. > if another developer wants to pick this up, i'm ok with it. jmc
