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1998-10-06  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/bits/in.h: Remove ipv6_mreq which is in
	netinet/in.h.
This commit is contained in:
Ulrich Drepper 1998-10-06 09:15:03 +00:00
parent c10bb7956d
commit 3cb0721780
3 changed files with 114 additions and 28 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
1998-10-06 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/bits/in.h: Remove ipv6_mreq which is in
netinet/in.h.
1998-10-05 Philip Blundell <philb@gnu.org>
* sysdeps/unix/sysv/linux/bits/in.h: Add various new structures

130
manual/memory.texi
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@ -573,7 +573,27 @@ case. The function returns @code{-1} if you call it too late, and
The easiest way to arrange to call @code{mcheck} early enough is to use
the option @samp{-lmcheck} when you link your program; then you don't
need to modify your program source at all.
need to modify your program source at all. Alternately you might use
a debugger to insert a call to @code{mcheck} whenever the program is
started, for example these gdb commands will automatically call @code{mcheck}
whenever the program starts:
@smallexample
(gdb) break main
Breakpoint 1, main (argc=2, argv=0xbffff964) at whatever.c:10
(gdb) command 1
Type commands for when breakpoint 1 is hit, one per line.
End with a line saying just "end".
>call mcheck(0)
>continue
>end
(gdb) ...
@end smallexample
This will however only work if no initialization function of any object
involved calls any of the @code{malloc} functions since @code{mcheck}
must be called before the first such function.
@end deftypefun
@deftypefun {enum mcheck_status} mprobe (void *@var{pointer})
@ -692,34 +712,86 @@ the @code{free} function was called. This value allows to trace the
memory consumption of the program.
@end defvar
@comment malloc.h
@comment GNU
@defvar __memalign_hook
The value of this variable is a pointer to function that @code{memalign}
uses whenever it is called. You should define this function to look
like @code{memalign}; that is, like:
@smallexample
void *@var{function} (size_t @var{size}, size_t @var{alignment})
@end smallexample
@end defvar
You must make sure that the function you install as a hook for one of
these functions does not call that function recursively without restoring
the old value of the hook first! Otherwise, your program will get stuck
in an infinite recursion.
in an infinite recursion. Before calling the function recursively, one
should make sure to restore all the hooks to their previous value. When
coming back from the recursive call, all the hooks should be resaved
since a hook might modify itself.
Here is an example showing how to use @code{__malloc_hook} properly. It
installs a function that prints out information every time @code{malloc}
is called.
Here is an example showing how to use @code{__malloc_hook} and
@code{__free_hook} properly. It installs a function that prints out
information every time @code{malloc} or @code{free} is called. We just
assume here that @code{realloc} and @code{memalign} are not used in our
program.
@smallexample
/* Global variables used to hold underlaying hook values. */
static void *(*old_malloc_hook) (size_t);
static void (*old_free_hook) (void*);
/* Prototypes for our hooks. */
static void *my_malloc_hook (size_t);
static void my_free_hook(void*);
static void *
my_malloc_hook (size_t size)
@{
void *result;
/* Restore all old hooks */
__malloc_hook = old_malloc_hook;
__free_hook = old_free_hook;
/* Call recursively */
result = malloc (size);
/* Save underlaying hooks */
old_malloc_hook = __malloc_hook;
old_free_hook = __free_hook;
/* @r{@code{printf} might call @code{malloc}, so protect it too.} */
printf ("malloc (%u) returns %p\n", (unsigned int) size, result);
/* Restore our own hooks */
__malloc_hook = my_malloc_hook;
__free_hook = my_free_hook;
return result;
@}
static void *
my_free_hook (void *ptr)
@{
/* Restore all old hooks */
__malloc_hook = old_malloc_hook;
__free_hook = old_free_hook;
/* Call recursively */
free (ptr);
/* Save underlaying hooks */
old_malloc_hook = __malloc_hook;
old_free_hook = __free_hook;
/* @r{@code{printf} might call @code{free}, so protect it too.} */
printf ("freed pointer %p\n", ptr);
/* Restore our own hooks */
__malloc_hook = my_malloc_hook;
__free_hook = my_free_hook;
@}
main ()
@{
...
old_malloc_hook = __malloc_hook;
old_free_hook = __free_hook;
__malloc_hook = my_malloc_hook;
__free_hook = my_free_hook;
...
@}
@end smallexample
@ -840,6 +912,9 @@ A pointer to a function that @code{realloc} uses whenever it is called.
@item void (*__free_hook) (void *@var{ptr}, void *@var{caller})
A pointer to a function that @code{free} uses whenever it is called.
@item void (*__memalign_hook) (size_t @var{size}, size_t @var{alignment})
A pointer to a function that @code{memalign} uses whenever it is called.
@item struct mallinfo mallinfo (void)
Return information about the current dynamic memory usage.
@xref{Statistics of Malloc}.
@ -1211,13 +1286,11 @@ as an obstack, it must initialize the obstack by calling
@comment GNU
@deftypefun int obstack_init (struct obstack *@var{obstack-ptr})
Initialize obstack @var{obstack-ptr} for allocation of objects. This
function calls the obstack's @code{obstack_chunk_alloc} function. It
returns 0 if @code{obstack_chunk_alloc} returns a null pointer, meaning
that it is out of memory. Otherwise, it returns 1. If you supply an
@code{obstack_chunk_alloc} function that calls @code{exit}
(@pxref{Program Termination}) or @code{longjmp} (@pxref{Non-Local
Exits}) when out of memory, you can safely ignore the value that
@code{obstack_init} returns.
function calls the obstack's @code{obstack_chunk_alloc} function. If
allocation of memory fails, the function pointed to by
@code{obstack_alloc_failed_handler} is called. The @code{obstack_init}
function always returns 1 (Compatibility notice: Former versions of
obstack returned 0 if allocation failed).
@end deftypefun
Here are two examples of how to allocate the space for an obstack and
@ -1239,6 +1312,24 @@ struct obstack *myobstack_ptr
obstack_init (myobstack_ptr);
@end smallexample
@comment obstack.h
@comment GNU
@defvar obstack_alloc_failed_handler
The value of this variable is a pointer to a function that
@code{obstack} uses when @code{obstack_chunk_alloc} fails to allocate
memory. The default action is to print a message and abort.
You should supply a function that either calls @code{exit}
(@pxref{Program Termination}) or @code{longjmp} (@pxref{Non-Local
Exits}) and doesn't return.
@smallexample
void my_obstack_alloc_failed (void)
@dots{}
obstack_alloc_failed_handler = &my_obstack_alloc_failed;
@end smallexample
@end defvar
@node Allocation in an Obstack
@subsection Allocation in an Obstack
@cindex allocation (obstacks)
@ -1256,13 +1347,9 @@ object which represents the obstack. Each obstack function or macro
requires you to specify an @var{obstack-ptr} as the first argument.
This function calls the obstack's @code{obstack_chunk_alloc} function if
it needs to allocate a new chunk of memory; it returns a null pointer if
@code{obstack_chunk_alloc} returns one. In that case, it has not
changed the amount of memory allocated in the obstack. If you supply an
@code{obstack_chunk_alloc} function that calls @code{exit}
(@pxref{Program Termination}) or @code{longjmp} (@pxref{Non-Local
Exits}) when out of memory, then @code{obstack_alloc} will never return
a null pointer.
it needs to allocate a new chunk of memory; it calls
@code{obstack_alloc_failed_handler} if allocation of memory by
@code{obstack_chunk_alloc} failed.
@end deftypefun
For example, here is a function that allocates a copy of a string @var{str}
@ -1288,8 +1375,9 @@ To allocate a block with specified contents, use the function
@comment GNU
@deftypefun {void *} obstack_copy (struct obstack *@var{obstack-ptr}, void *@var{address}, int @var{size})
This allocates a block and initializes it by copying @var{size}
bytes of data starting at @var{address}. It can return a null pointer
under the same conditions as @code{obstack_alloc}.
bytes of data starting at @var{address}. It calls
@code{obstack_alloc_failed_handler} if allocation of memory by
@code{obstack_chunk_alloc} failed.
@end deftypefun
@comment obstack.h

7
sysdeps/unix/sysv/linux/bits/in.h
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@ -84,13 +84,6 @@ struct ip_mreqn
int imr_ifindex; /* Interface index */
};
/* As above but for IPv6. */
struct ipv6_mreq
{
struct in6_addr ipv6mr_multiaddr; /* IPv6 multicast address of group */
int ipv6mr_ifindex; /* local IPv6 address of interface */
};
/* Options for use with `getsockopt' and `setsockopt' at the IPv6 level.
The first word in the comment at the right is the data type used;
"bool" means a boolean value stored in an `int'. */