+++ /dev/null
-/* Support for an sbrk-like function that uses mmap. */
-
-/* Copyright (c) 2010-2014. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-/* Copyright 1992, 2000 Free Software Foundation, Inc.
-
- Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com */
-
-#include "src/internal_config.h"
-#if HAVE_UNISTD_H
-#include <unistd.h> /* Prototypes for lseek */
-#endif
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/wait.h>
-#include <errno.h>
-
-#include "mmprivate.h"
-
-#ifndef MAP_ANONYMOUS
-#define MAP_ANONYMOUS MAP_ANON
-#endif
-
-#define PAGE_ALIGN(addr) (void*) (((long)(addr) + xbt_pagesize - 1) & \
- ~((long)xbt_pagesize - 1))
-
-/* Return MAP_PRIVATE if MDP represents /dev/zero. Otherwise, return
- MAP_SHARED. */
-#define MAP_PRIVATE_OR_SHARED(MDP) (( MDP -> flags & MMALLOC_ANONYMOUS) \
- ? MAP_PRIVATE \
- : MAP_SHARED)
-
-/* Return MAP_ANONYMOUS if MDP uses anonymous mapping. Otherwise, return 0 */
-#define MAP_IS_ANONYMOUS(MDP) (((MDP) -> flags & MMALLOC_ANONYMOUS) \
- ? MAP_ANONYMOUS \
- : 0)
-
-/* Return -1 if MDP uses anonymous mapping. Otherwise, return MDP->FD */
-#define MAP_ANON_OR_FD(MDP) (((MDP) -> flags & MMALLOC_ANONYMOUS) \
- ? -1 \
- : (MDP) -> fd)
-
-/* Return 0if MDP uses anonymous mapping. Otherwise, return off */
-#define MAP_ANON_OR_OFFSET(MDP, off) (((MDP) -> flags & MMALLOC_ANONYMOUS) \
- ? 0 \
- : off)
-
-/** @brief Add memoty to this heap
- *
- * Get core for the memory region specified by MDP, using SIZE as the
- * amount to either add to or subtract from the existing region. Works
- * like sbrk(), but using mmap().
- *
- * It never returns NULL. Instead, it dies verbosely on errors.
- *
- * @param mdp The heap
- * @param size Bytes to allocate for this heap (or <0 to free memory from this heap)
- */
-void *mmorecore(struct mdesc *mdp, ssize_t size)
-{
- ssize_t test = 0;
- void* result; // please keep it uninitialized to track issues
- off_t foffset; /* File offset at which new mapping will start */
- size_t mapbytes; /* Number of bytes to map */
- void* moveto; /* Address where we wish to move "break value" to */
- void* mapto; /* Address we actually mapped to */
- char buf = 0; /* Single byte to write to extend mapped file */
-
- if (size == 0) {
- /* Just return the current "break" value. */
- return mdp->breakval;
- }
-
- if (size < 0) {
- /* We are deallocating memory. If the amount requested would cause us to try to deallocate back past the base of
- * the mmap'd region then die verbosely. Otherwise, deallocate the memory and return the old break value. */
- if (((char*)mdp->breakval) + size >= (char*)mdp->base) {
- result = (void*)mdp->breakval;
- mdp->breakval = (char*)mdp->breakval + size;
- moveto = PAGE_ALIGN(mdp->breakval);
- munmap(moveto, (size_t)(((char*)mdp->top) - ((char*)moveto)) - 1);
- mdp->top = moveto;
- } else {
- fprintf(stderr,"Internal error: mmap was asked to deallocate more memory than it previously allocated. Bailling out now!\n");
- abort();
- }
- } else {
- /* We are allocating memory. Make sure we have an open file descriptor if not working with anonymous memory. */
- if (!(mdp->flags & MMALLOC_ANONYMOUS) && mdp->fd < 0) {
- fprintf(stderr,"Internal error: mmap file descriptor <0 (%d), without MMALLOC_ANONYMOUS being in the flags.\n",mdp->fd);
- abort();
- } else if ((char*)mdp->breakval + size > (char*)mdp->top) {
- /* The request would move us past the end of the currently mapped memory, so map in enough more memory to satisfy
- the request. This means we also have to grow the mapped-to file by an appropriate amount, since mmap cannot
- be used to extend a file. */
- moveto = PAGE_ALIGN((char*)mdp->breakval + size);
- mapbytes = (char*)moveto - (char*)mdp->top;
- foffset = (char*)mdp->top - (char*)mdp->base;
-
- if (mdp->fd > 0) {
- /* FIXME: Test results of lseek() */
- lseek(mdp->fd, foffset + mapbytes - 1, SEEK_SET);
- test = write(mdp->fd, &buf, 1);
- if (test == -1) {
- fprintf(stderr,"Internal error: write to mmap'ed fd failed! error: %s", strerror(errno));
- abort();
- }
- }
-
- /* Let's call mmap. Note that it is possible that mdp->top is 0. In this case mmap will choose the address for us.
- This call might very well overwrite an already existing memory mapping (leading to weird bugs).
- */
- mapto = mmap(mdp->top, mapbytes, PROT_READ | PROT_WRITE,
- MAP_PRIVATE_OR_SHARED(mdp) | MAP_IS_ANONYMOUS(mdp) |
- MAP_FIXED, MAP_ANON_OR_FD(mdp), MAP_ANON_OR_OFFSET(mdp, foffset));
-
- if (mapto == MAP_FAILED) {
- char buff[1024];
- fprintf(stderr,"Internal error: mmap returned MAP_FAILED! error: %s\n",strerror(errno));
- snprintf(buff,1024,"cat /proc/%d/maps",getpid());
- int status = system(buff);
- if (status == -1 || !(WIFEXITED(status) && WEXITSTATUS(status) == 0))
- fprintf(stderr, "Something went wrong when trying to %s\n", buff);
- sleep(1);
- abort();
- }
-
- if (mdp->top == 0)
- mdp->base = mdp->breakval = mapto;
-
- mdp->top = PAGE_ALIGN((char*)mdp->breakval + size);
- result = (void *) mdp->breakval;
- mdp->breakval = (char*)mdp->breakval + size;
- } else {
- /* Memory is already mapped, we only need to increase the breakval: */
- result = (void *) mdp->breakval;
- mdp->breakval = (char*)mdp->breakval + size;
- }
- }
- return (result);
-}
-
-void *__mmalloc_remap_core(xbt_mheap_t mdp)
-{
- /* FIXME: Quick hack, needs error checking and other attention. */
-
- return mmap(mdp->base, (char*) mdp->top - (char*) mdp->base,
- PROT_READ | PROT_WRITE | PROT_EXEC,
- MAP_PRIVATE_OR_SHARED(mdp) | MAP_FIXED, mdp->fd, 0);
-}
-
