got it.
> On Nov 24, 2017, at 8:22 AM, Nala Ginrut <nalagin...@gmail.com> wrote:
>
> Thanks for the work! Could you please add MAP_POPULATE too?
>
> 2017年11月24日 下午11:55，"Matt Wette" <matt.we...@gmail.com
> <mailto:matt.we...@gmail.com>>写道：
>
>
>
>
>
> I did a little more on this. Here is the latest.
> It provides mmap (not searched) and mmap/search (searched for pointers to GC).
>
>
> --- libguile/filesys.c.orig 2017-03-01 10:54:31.000000000 -0800
> +++ libguile/filesys.c 2017-10-28 10:05:10.000000000 -0700
> @@ -1828,9 +1828,14 @@
>
>
>
> +#include "mman.c"
> +
> void
> scm_init_filesys ()
> {
> +#ifdef HAVE_SYS_MMAN_H
> + init_mman();
> +#endif
> #ifdef HAVE_POSIX
> scm_tc16_dir = scm_make_smob_type ("directory", 0);
> scm_set_smob_free (scm_tc16_dir, scm_dir_free);
> --- libguile/mman.c.orig 2017-10-28 10:05:10.000000000 -0700
> +++ libguile/mman.c 2017-11-04 09:23:35.000000000 -0700
> @@ -0,0 +1,199 @@
> +// mman.c - v171104a
> +#ifdef HAVE_CONFIG_H
> +# include <config.h>
> +#endif
> +
> +#ifdef HAVE_SYS_MMAN_H
> +# include <sys/mman.h>
> +# include <errno.h>
> +#endif
> +
> +#if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MAP_ANONYMOUS)
> +
> +#include "libguile/_scm.h"
> +#include "libguile/smob.h"
> +#include "libguile/fdes-finalizers.h"
> +#include "libguile/feature.h"
> +
> +SCM_API SCM scm_mmap_search (SCM addr, SCM len, SCM prot, SCM flags, SCM fd,
> + SCM offset);
> +SCM_API SCM scm_mmap (SCM addr, SCM len, SCM prot, SCM flags, SCM fd,
> + SCM offset);
> +SCM_API SCM scm_munmap (SCM bvec);
> +void init_mman(void);
> +static void mmap_finalizer (void *ptr, void *data);
> +
> +SCM_DEFINE (scm_mmap_search, "mmap/search", 2, 4, 0,
> + (SCM addr, SCM len, SCM prot, SCM flags, SCM fd, SCM offset),
> + "mmap addr len [prot [flags [fd [offset]]]]"
> + "See the unix man page for mmap. Returns a bytevector."
> + "Note that the region allocated will be searched by the garbage"
> + "collector for pointers. \n"
> + " Defaults:\n"
> + " PROT (logior PROT_READ PROT_WRITE)\n"
> + " FLAGS (logior MAP_ANON MAP_PRIVATE)\n"
> + " FD -1\n"
> + " OFFSET 0\n"
> + "@example\n(define reg (mmap/search %null-pointer #x1000)\n"
> + "@end example"
> + )
> +#define FUNC_NAME s_scm_mmap_search
> +{
> + void *c_mem, *c_addr;
> + size_t c_len;
> + int c_prot, c_flags, c_fd;
> + scm_t_off c_offset;
> + SCM pointer, bvec;
> +
> + if (SCM_POINTER_P (addr))
> + c_addr = SCM_POINTER_VALUE (addr);
> + else if (scm_is_integer (addr))
> + c_addr = (void*) scm_to_uintptr_t (addr);
> + else
> + SCM_MISC_ERROR("bad addr", addr);
> +
> + c_len = scm_to_size_t (len);
> +
> + if (SCM_UNBNDP (prot))
> + c_prot = PROT_READ | PROT_WRITE;
> + else
> + c_prot = scm_to_int (prot);
> +
> + if (SCM_UNBNDP (flags))
> + c_flags = MAP_ANON | MAP_PRIVATE;
> + else
> + c_flags = scm_to_int (flags);
> +
> + if (SCM_UNBNDP (fd))
> + c_fd = -1;
> + else
> + c_fd = scm_to_int (fd);
> +
> + if (SCM_UNBNDP (fd))
> + c_offset = 0;
> + else
> + c_offset = scm_to_off_t (offset);
> +
> + c_mem = mmap(c_addr, c_len, c_prot, c_flags, c_fd, c_offset);
> + if (c_mem == MAP_FAILED)
> + SCM_SYSERROR; /* errno set */
> +
> + pointer = scm_cell (scm_tc7_pointer, (scm_t_bits) c_mem);
> + bvec = scm_c_take_typed_bytevector((signed char *) c_mem + c_offset, c_len,
> + SCM_ARRAY_ELEMENT_TYPE_VU8, pointer);
> + /* if sizeof(void*) < sizeof(size_t) we are in trouble: */
> + scm_i_set_finalizer (SCM2PTR (bvec), mmap_finalizer, (void*) c_len);
> + return bvec;
> +}
> +#undef FUNC_NAME
> +
> +SCM_DEFINE (scm_mmap, "mmap", 2, 4, 0,
> + (SCM addr, SCM len, SCM prot, SCM flags, SCM fd, SCM offset),
> + "mmap addr len [prot [flags [fd [offset]]]]"
> + "See the man page. Returns a bytevector."
> + "Note that the region returned by mmap will NOT be searched "
> + "by the garbage collector for pointers.\n"
> + "Defaults:\n"
> + " PROT (logior PROT_READ PROT_WRITE)\n"
> + " FLAGS (logior MAP_ANON MAP_PRIVATE)\n"
> + " FD -1\n"
> + " OFFSET 0\n"
> + "@example\n"
> + "(define bvec-1MB (mmap 0 #x100000)\n"
> + "@end example"
> + )
> +#define FUNC_NAME s_scm_mmap
> +{
> + SCM bvec;
> + void *c_mem;
> + size_t c_len;
> +
> + bvec = scm_mmap_search(addr, len, prot, flags, fd, offset);
> + c_mem = SCM_BYTEVECTOR_CONTENTS(bvec);
> + c_len = SCM_BYTEVECTOR_LENGTH(bvec);
> +
> + /* tell GC not to scan for pointers */
> + GC_exclude_static_roots(c_mem, (char*) c_mem + c_len);
> +
> + return bvec;
> +}
> +static void
> +mmap_finalizer (void *ptr, void *data)
> +{
> + void *c_addr;
> + intptr_t c_len;
> + int res;
> +
> + c_addr = (void *) SCM_POINTER_VALUE (SCM_PACK_POINTER (ptr));
> + c_len = (intptr_t) data;
> + res = munmap(c_addr, c_len);
> + if (res != 0) SCM_SYSERROR;
> +}
> +#undef FUNC_NAME
> +
> +SCM_DEFINE (scm_munmap, "munmap", 1, 0, 0,
> + (SCM bvec),
> + "See the man page. Given bytevector unmap."
> + )
> +#define FUNC_NAME s_scm_munmap
> +{
> + void *c_addr;
> + size_t c_len;
> + int c_res;
> +
> + SCM_VALIDATE_BYTEVECTOR (1, bvec);
> +
> + c_addr = (void *) SCM_BYTEVECTOR_CONTENTS (bvec);
> + c_len = SCM_BYTEVECTOR_LENGTH (bvec);
> +
> + c_res = munmap(c_addr, c_len);
> + if (c_res == -1)
> + SCM_SYSERROR; /* errno set */
> +
> + // TODO: clean up bytevector
> + return SCM_UNSPECIFIED;
> +}
> +#undef FUNC_NAME
> +
> +void init_mman(void) {
> +#ifdef PROT_NONE
> + scm_c_define ("PROT_NONE", scm_from_int (PROT_NONE));
> +#endif
> +#ifdef PROT_
> + scm_c_define ("PROT_READ", scm_from_int (PROT_READ));
> +#endif
> +#ifdef PROT_
> + scm_c_define ("PROT_WRITE", scm_from_int (PROT_WRITE));
> +#endif
> +#ifdef PROT_
> + scm_c_define ("PROT_EXEC", scm_from_int (PROT_EXEC));
> +#endif
> +
> +#ifdef MAP_ANONYMOUS
> + scm_c_define ("MAP_ANONYMOUS", scm_from_int (MAP_ANONYMOUS));
> +#endif
> +#ifdef MAP_ANON
> + scm_c_define ("MAP_ANON", scm_from_int (MAP_ANON));
> +#endif
> +#ifdef MAP_FILE
> + scm_c_define ("MAP_FILE", scm_from_int (MAP_FILE));
> +#endif
> +#ifdef MAP_FIXED
> + scm_c_define ("MAP_FIXED", scm_from_int (MAP_FIXED));
> +#endif
> +#ifdef MAP_HASSEMAPHORE
> + scm_c_define ("MAP_HASSEMAPHORE", scm_from_int (MAP_HASSEMAPHORE));
> +#endif
> +#ifdef MAP_PRIVATE
> + scm_c_define ("MAP_PRIVATE", scm_from_int (MAP_PRIVATE));
> +#endif
> +#ifdef MAP_SHARED
> + scm_c_define ("MAP_SHARED", scm_from_int (MAP_SHARED));
> +#endif
> +#ifdef MAP_NOCACHE
> + scm_c_define ("MAP_NOCACHE", scm_from_int (MAP_NOCACHE));
> +#endif
> + scm_c_define ("PAGE_SIZE", scm_from_int (getpagesize()));
> +}
> +
> +#endif /* HAVE_SYS_MMAN_H */
>
>
>
>
