-/* Support for an sbrk-like function that uses mmap.
- Copyright 1992, 2000 Free Software Foundation, Inc.
+/* Support for an sbrk-like function that uses mmap. */
- Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com */
-
-/* Copyright (c) 2010. The SimGrid Team.
+/* 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. */
-#ifndef MAP_ANONYMOUS
-#define MAP_ANONYMOUS MAP_ANON
-#endif
+/* Copyright 1992, 2000 Free Software Foundation, Inc.
+
+ Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com */
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* Prototypes for lseek */
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
+#include <sys/wait.h>
#include "mmprivate.h"
-#include "xbt/ex.h"
-/* Cache the pagesize for the current host machine. Note that if the host
- does not readily provide a getpagesize() function, we need to emulate it
- elsewhere, not clutter up this file with lots of kluges to try to figure
- it out. */
-
-static size_t pagesize;
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif
-#define PAGE_ALIGN(addr) (void*) (((long)(addr) + pagesize - 1) & \
- ~(pagesize - 1))
+#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_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)
+ ? 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)
+ ? -1 \
+ : (MDP) -> fd)
/* 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(). */
+ like sbrk(), but using mmap().
+
+ It never returns NULL. Instead, it dies verbosely on errors. */
-void *mmorecore(struct mdesc *mdp, int size)
+void *mmorecore(struct mdesc *mdp, ssize_t size)
{
ssize_t test = 0;
- void *result = NULL;
+ 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 (pagesize == 0)
- pagesize = getpagesize();
+// fprintf(stderr,"increase %p by %u\n",mdp,size);
if (size == 0) {
/* Just return the current "break" value. */
} else 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 do nothing, and return NULL. Otherwise, deallocate the
- memory and return the old break value. */
+ 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;
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) {
- THROWF(system_error,0,"mmap file descriptor <0 (%d), without MMALLOC_ANONYMOUS being in the flags",mdp->fd);
- result = NULL;
+ 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
/* FIXME: Test results of lseek() */
lseek(mdp->fd, foffset + mapbytes - 1, SEEK_SET);
test = write(mdp->fd, &buf, 1);
- if (test == -1)
- THROWF(system_error, 0, "write to mmap'ed fd failed! error: %s", strerror(errno));
+ 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
MAP_PRIVATE_OR_SHARED(mdp) | MAP_IS_ANONYMOUS(mdp) |
MAP_FIXED, MAP_ANON_OR_FD(mdp), foffset);
- if (mapto != (void *) -1/* That's MAP_FAILED */) {
+ if (mapto == (void *) -1/* That's MAP_FAILED */) {
+ char buff[1024];
+ fprintf(stderr,"Internal error: mmap returned MAP_FAILED! error: %s\n",strerror(errno));
+ sprintf(buff,"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;
+ 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 {
- THROWF(system_error,0,"mmap returned MAP_FAILED! error: %s",strerror(errno));
- }
+ mdp->top = PAGE_ALIGN((char *) mdp->breakval + size);
+ result = (void *) mdp->breakval;
+ mdp->breakval = (char *) mdp->breakval + size;
} else {
result = (void *) mdp->breakval;
mdp->breakval = (char *) mdp->breakval + size;
return (result);
}
-void *__mmalloc_remap_core(struct mdesc *mdp)
+void *__mmalloc_remap_core(xbt_mheap_t mdp)
{
- void *base;
-
/* FIXME: Quick hack, needs error checking and other attention. */
- base = mmap(mdp->base, (char *) mdp->top - (char *) mdp->base,
+ 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);
- return ((void *) base);
}
-void *mmalloc_findbase(int size)
-{
- int fd;
- int flags;
- void *base = NULL;
-
-#ifdef MAP_ANONYMOUS
- flags = MAP_PRIVATE | MAP_ANONYMOUS;
- fd = -1;
-#else
-#ifdef MAP_FILE
- flags = MAP_PRIVATE | MAP_FILE;
-#else
- flags = MAP_PRIVATE;
-#endif
- fd = open("/dev/zero", O_RDWR);
- if (fd != -1) {
- return ((void *) NULL);
- }
-#endif
- base = mmap(0, size, PROT_READ | PROT_WRITE, flags, fd, 0);
- if (base != (void *) -1) {
- munmap(base, (size_t) size);
- }
- if (fd != -1) {
- close(fd);
- }
- if (base == 0) {
- /* Don't allow mapping at address zero. We use that value
- to signal an error return, and besides, it is useful to
- catch NULL pointers if it is unmapped. Instead start
- at the next page boundary. */
- base = (void *) (long) getpagesize();
- } else if (base == (void *) -1) {
- base = NULL;
- }
- return ((void *) base);
-}
