+++ /dev/null
-/*
- * compat/compat_mman.h
- *
- * Copyright (C) 2013 JP Ikaheimonen <jp_ikaheimonen@mentor.com>
- * 2016 Michael Jeanson <mjeanson@efficios.com>
- *
- * These sources are based on ftp://g.oswego.edu/pub/misc/malloc.c
- * file by Doug Lea, released to the public domain.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#define BT_LOG_TAG "COMPAT-MMAN"
-#include "logging.h"
-
-#ifdef __APPLE__
-/*
- * On macOS, we need a dummy symbol so that the linker won't
- * complain of an empty table of contents.
- */
-BT_HIDDEN
-int bt_mman_dummy_symbol;
-#endif /* __APPLE__ */
-
-#ifdef __MINGW32__
-
-#include <errno.h>
-#include <io.h>
-#include <pthread.h>
-#include <stdlib.h>
-#include <windows.h>
-#include <babeltrace2/compat/mman-internal.h>
-
-struct mmap_mapping {
- /* The duplicated handle. */
- HANDLE file_handle;
- /* Handle returned by CreateFileMapping. */
- HANDLE map_handle;
-};
-
-static
-GHashTable *mmap_mappings = NULL;
-
-/*
- * This mutex protects the hashtable of memory mappings.
- */
-static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-static
-struct mmap_mapping *mapping_create(void)
-{
- struct mmap_mapping *mapping;
-
- mapping = malloc(sizeof(struct mmap_mapping));
- if (mapping != NULL) {
- mapping->file_handle = NULL;
- mapping->map_handle = NULL;
- }
-
- return mapping;
-}
-
-static
-void mapping_clean(struct mmap_mapping *mapping)
-{
- if (mapping) {
- if (!CloseHandle(mapping->map_handle)) {
- BT_LOGF_STR("Failed to close mmap map_handle.");
- abort();
- }
- if (!CloseHandle(mapping->file_handle)) {
- BT_LOGF_STR("Failed to close mmap file_handle.");
- abort();
- }
- free(mapping);
- mapping = NULL;
- }
-}
-
-static
-void addr_clean(void *addr)
-{
- /* Cleanup of handles should never fail. */
- if (!UnmapViewOfFile(addr)) {
- BT_LOGF_STR("Failed to unmap mmap mapping.");
- abort();
- }
-}
-
-static
-void mmap_lock(void)
-{
- if (pthread_mutex_lock(&mmap_mutex)) {
- BT_LOGF_STR("Failed to acquire mmap_mutex.");
- abort();
- }
-}
-
-static
-void mmap_unlock(void)
-{
- if (pthread_mutex_unlock(&mmap_mutex)) {
- BT_LOGF_STR("Failed to release mmap_mutex.");
- abort();
- }
-}
-
-/*
- * Convert mmap memory protection flags to CreateFileMapping page protection
- * flag and MapViewOfFile desired access flag.
- */
-static
-DWORD map_prot_flags(int prot, DWORD *dwDesiredAccess)
-{
- if (prot & PROT_READ) {
- if (prot & PROT_WRITE) {
- *dwDesiredAccess = FILE_MAP_WRITE;
- if (prot & PROT_EXEC) {
- return PAGE_EXECUTE_READWRITE;
- }
- return PAGE_READWRITE;
- }
- if (prot & PROT_EXEC) {
- *dwDesiredAccess = FILE_MAP_EXECUTE;
- return PAGE_EXECUTE_READ;
- }
- *dwDesiredAccess = FILE_MAP_READ;
- return PAGE_READONLY;
- }
- if (prot & PROT_WRITE) {
- *dwDesiredAccess = FILE_MAP_COPY;
- return PAGE_WRITECOPY;
- }
- if (prot & PROT_EXEC) {
- *dwDesiredAccess = FILE_MAP_EXECUTE;
- return PAGE_EXECUTE_READ;
- }
-
- /* Mapping failed. */
- *dwDesiredAccess = 0;
- return 0;
-}
-
-BT_HIDDEN
-void *bt_mmap(void *addr, size_t length, int prot, int flags, int fd,
- off_t offset)
-{
- struct mmap_mapping *mapping = NULL;
- void *mapping_addr;
- DWORD dwDesiredAccess;
- DWORD flProtect;
- HANDLE handle;
-
- /* Check for a valid fd. */
- if (fd == -1) {
- _set_errno(EBADF);
- goto error;
- }
-
- /* We don't support this at the moment. */
- if (flags == MAP_FIXED) {
- _set_errno(ENOTSUP);
- goto error;
- }
-
- /* Map mmap flags to those of the Windows API. */
- flProtect = map_prot_flags(prot, &dwDesiredAccess);
- if (flProtect == 0) {
- _set_errno(EINVAL);
- goto error;
- }
-
- /* Allocate the mapping struct. */
- mapping = mapping_create();
- if (!mapping) {
- BT_LOGE_STR("Failed to allocate mmap mapping.");
- _set_errno(ENOMEM);
- goto error;
- }
-
- /* Get a handle from the fd. */
- handle = (HANDLE) _get_osfhandle(fd);
-
- /* Duplicate the handle and store it in 'mapping.file_handle'. */
- if (!DuplicateHandle(GetCurrentProcess(), handle, GetCurrentProcess(),
- &mapping->file_handle, 0, FALSE,
- DUPLICATE_SAME_ACCESS)) {
- _set_errno(ENOMEM);
- goto error;
- }
-
- /*
- * Create a file mapping object with a maximum size
- * of 'offset' + 'length'.
- */
- mapping->map_handle = CreateFileMapping(mapping->file_handle, NULL,
- flProtect, 0, offset + length, NULL);
- if (mapping->map_handle == 0) {
- _set_errno(EACCES);
- goto error;
- }
-
- /* Map the requested block starting at 'offset' for 'length' bytes. */
- mapping_addr = MapViewOfFile(mapping->map_handle, dwDesiredAccess, 0,
- offset, length);
- if (mapping_addr == 0) {
- DWORD dwLastErr = GetLastError();
- if (dwLastErr == ERROR_MAPPED_ALIGNMENT) {
- _set_errno(EINVAL);
- } else {
- _set_errno(EACCES);
- }
- goto error;
- }
-
- mmap_lock();
-
- /* If we have never done any mappings, allocate the hashtable. */
- if (!mmap_mappings) {
- mmap_mappings = g_hash_table_new_full(g_direct_hash,
- g_direct_equal, (GDestroyNotify) addr_clean,
- (GDestroyNotify) mapping_clean);
- if (!mmap_mappings) {
- BT_LOGE_STR("Failed to allocate mmap hashtable.");
- _set_errno(ENOMEM);
- goto error_mutex_unlock;
- }
- }
-
- /* Add the new mapping to the hashtable. */
- g_hash_table_insert(mmap_mappings, mapping_addr, mapping);
-
- mmap_unlock();
-
- return mapping_addr;
-
-error_mutex_unlock:
- mmap_unlock();
-error:
- mapping_clean(mapping);
- return MAP_FAILED;
-}
-
-BT_HIDDEN
-int bt_munmap(void *addr, size_t length)
-{
- int ret = 0;
-
- mmap_lock();
-
- /* Check if the mapping exists in the hashtable. */
- if (g_hash_table_lookup(mmap_mappings, addr) == NULL) {
- _set_errno(EINVAL);
- ret = -1;
- goto end;
- }
-
- /* Remove it. */
- if (!g_hash_table_remove(mmap_mappings, addr)) {
- BT_LOGF_STR("Failed to remove mapping from hashtable.");
- abort();
- }
-
-end:
- mmap_unlock();
- return ret;
-}
-
-#endif
projects / babeltrace.git / blobdiff