diff options
| -rw-r--r-- | util/mmap_posix.cpp | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/util/mmap_posix.cpp b/util/mmap_posix.cpp index 1ea20fe21f7..c4f486412e8 100644 --- a/util/mmap_posix.cpp +++ b/util/mmap_posix.cpp @@ -98,14 +98,28 @@ namespace mongo { return view; } + + void* MemoryMappedFile::createReadOnlyMap() { + void * x = mmap( /*start*/0 , len , PROT_READ , MAP_SHARED , fd , 0 ); + if( x == MAP_FAILED ) { + if ( errno == ENOMEM ) { + if( sizeof(void*) == 4 ) + error() << "mmap ro failed with out of memory. You are using a 32-bit build and probably need to upgrade to 64" << endl; + else + error() << "mmap ro failed with out of memory. (64 bit build)" << endl; + } + return 0; + } + return x; + } - void* MemoryMappedFile::testGetCopyOnWriteView(){ + void* MemoryMappedFile::testGetCopyOnWriteView() { void * x = mmap( NULL , len , PROT_READ | PROT_WRITE , MAP_PRIVATE , fd , 0 ); - assert( x ); + assert( x != MAP_FAILED ); return x; } - void MemoryMappedFile::testCloseCopyOnWriteView(void * x ){ + void MemoryMappedFile::testCloseCopyOnWriteView(void * x ) { munmap(x,len); } |