diff options
Diffstat (limited to 'manual/memory.texi')
| -rw-r--r-- | manual/memory.texi | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/manual/memory.texi b/manual/memory.texi index 91abb7f5d4..91b9d84eb2 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -948,7 +948,7 @@ program. #include <malloc.h> /* Prototypes for our hooks. */ -static void *my_init_hook (void); +static void my_init_hook (void); static void *my_malloc_hook (size_t, const void *); static void my_free_hook (void*, const void *); @@ -984,7 +984,7 @@ my_malloc_hook (size_t size, const void *caller) return result; @} -static void * +static void my_free_hook (void *ptr, const void *caller) @{ /* Restore all old hooks */ @@ -1968,7 +1968,8 @@ obstack_next_free (@var{obstack-ptr}) - obstack_base (@var{obstack-ptr}) Each obstack has an @dfn{alignment boundary}; each object allocated in the obstack automatically starts on an address that is a multiple of the -specified boundary. By default, this boundary is 4 bytes. +specified boundary. By default, this boundary is aligned so that +the object can hold any type of data. To access an obstack's alignment boundary, use the macro @code{obstack_alignment_mask}, whose function prototype looks like @@ -1980,7 +1981,9 @@ this: The value is a bit mask; a bit that is 1 indicates that the corresponding bit in the address of an object should be 0. The mask value should be one less than a power of 2; the effect is that all object addresses are -multiples of that power of 2. The default value of the mask is 3, so that +multiples of that power of 2. The default value of the mask is a value +that allows aligned objects to hold any type of data: for example, if +its value is 3, any type of data can be stored at locations whose addresses are multiples of 4. A mask value of 0 means an object can start on any multiple of 1 (that is, no alignment is required). @@ -2384,7 +2387,7 @@ exceed the process' data storage limit. @comment unistd.h @comment BSD -@deftypefun int sbrk (ptrdiff_t @var{delta}) +@deftypefun void *sbrk (ptrdiff_t @var{delta}) This function is the same as @code{brk} except that you specify the new end of the data segment as an offset @var{delta} from the current end and on success the return value is the address of the resulting end of |