static void *intercept_mremap (void *start, size_t oldlen, void *new_address, size_t newlen, int flags)
#endif
{
OPAL_PATCHER_BEGIN;
void *result = MAP_FAILED;
if (MAP_FAILED != start && oldlen > 0) {
opal_mem_hooks_release_hook (start, oldlen, true);
}
#if defined(MREMAP_FIXED)
if (!(flags & MREMAP_FIXED)) {
new_address = NULL;
}
#endif
#if defined(__linux__)
if (!original_mremap) {
result = (void *)(intptr_t) memory_patcher_syscall (SYS_mremap, start, oldlen, newlen, flags, new_address);
} else {
result = original_mremap (start, oldlen, newlen, flags, new_address);
}
#else
if (!original_mremap) {
result = (void *)(intptr_t) memory_patcher_syscall (SYS_mremap, start, oldlen, new_address, newlen, flags);
} else {
result = original_mremap (start, oldlen, new_address, newlen, flags);
}
#endif
OPAL_PATCHER_END;
return result;
}
static void *intercept_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
{
OPAL_PATCHER_BEGIN;
void *result = 0;
if (prot == PROT_NONE) {
opal_mem_hooks_release_hook (start, length, true);
}
if (!original_mmap) {
#if OPAL_MEMORY_PATCHER_HAVE___MMAP
/* the darwin syscall returns an int not a long so call the underlying __mmap function */
result = __mmap (start, length, prot, flags, fd, offset);
#else
result = (void*)(intptr_t) memory_patcher_syscall(SYS_mmap, start, length, prot, flags, fd, offset);
#endif
// I thought we had some issue in the past with the above line for IA32,
// like maybe syscall() wouldn't handle that many arguments. But just now
// I used gcc -m32 and it worked on a recent system. But there's a possibility
// that older ia32 systems may need some other code to make the above syscall.
} else {
result = original_mmap (start, length, prot, flags, fd, offset);
}
OPAL_PATCHER_END;
return result;
}
static int intercept_shmdt (const void *shmaddr)
{
OPAL_PATCHER_BEGIN;
int result;
opal_mem_hooks_release_hook (shmaddr, memory_patcher_get_shm_seg_size (shmaddr), false);
if (original_shmdt) {
result = original_shmdt (shmaddr);
} else {
result = memory_patcher_syscall (SYS_shmdt, shmaddr);
}
OPAL_PATCHER_END;
return result;
}
static int intercept_munmap(void *start, size_t length)
{
OPAL_PATCHER_BEGIN;
int result = 0;
opal_mem_hooks_release_hook (start, length, false);
if (!original_munmap) {
result = memory_patcher_syscall(SYS_munmap, start, length);
} else {
result = original_munmap (start, length);
}
OPAL_PATCHER_END;
return result;
}
static int intercept_shmdt (const void *shmaddr)
{
OPAL_PATCHER_BEGIN;
int result;
/* opal_mem_hooks_release_hook should probably be updated to take a const void *.
* for now just cast away the const */
opal_mem_hooks_release_hook ((void *) shmaddr, memory_patcher_get_shm_seg_size (shmaddr), false);
if (original_shmdt) {
result = original_shmdt (shmaddr);
} else {
result = memory_patcher_syscall (SYS_shmdt, shmaddr);
}
OPAL_PATCHER_END;
return result;
}
static int intercept_brk (void *addr)
{
OPAL_PATCHER_BEGIN;
int result = 0;
void *old_addr, *new_addr;
#if OPAL_MEMORY_PATCHER_HAVE___CURBRK
old_addr = __curbrk;
#else
old_addr = sbrk (0);
#endif
if (!original_brk) {
/* get the current_addr */
new_addr = (void *) (intptr_t) memory_patcher_syscall(SYS_brk, addr);
#if OPAL_MEMORY_PATCHER_HAVE___CURBRK
/*
* Note: if we were using glibc brk/sbrk, their __curbrk would get
* updated, but since we're going straight to the syscall, we have
* to update __curbrk or else glibc won't see it.
*/
__curbrk = new_addr;
#endif
} else {
result = original_brk (addr);
#if OPAL_MEMORY_PATCHER_HAVE___CURBRK
new_addr = __curbrk;
#else
new_addr = sbrk (0);
#endif
}
if (new_addr < addr) {
errno = ENOMEM;
result = -1;
} else if (new_addr < old_addr) {
opal_mem_hooks_release_hook (new_addr, (intptr_t) old_addr - (intptr_t) new_addr, true);
}
OPAL_PATCHER_END;
return result;
}
static int intercept_madvise (void *start, size_t length, int advice)
{
OPAL_PATCHER_BEGIN;
int result = 0;
if (advice == MADV_DONTNEED ||
#ifdef MADV_REMOVE
advice == MADV_REMOVE ||
#endif
advice == POSIX_MADV_DONTNEED)
{
opal_mem_hooks_release_hook (start, length, false);
}
if (!original_madvise) {
result = memory_patcher_syscall(SYS_madvise, start, length, advice);
} else {
result = original_madvise (start, length, advice);
}
OPAL_PATCHER_END;
return result;
}