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mapped file -- if length is 0, return an unopened mapped file. Posix would EINVAL on a length of 0.

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This commit is contained in:
Kelvin Sherlock 2016-08-07 15:37:02 -04:00
parent 50ac7355bd
commit fbcbfffcb5
1 changed files with 16 additions and 8 deletions
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24
cxx/mapped_file.cpp
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@ -66,7 +66,6 @@ void mapped_file_base::open(const path_type& p, mapmode flags, size_t length, si
HANDLE fh; HANDLE fh;
HANDLE mh; HANDLE mh;
LARGE_INTEGER file_size;
// length of 0 in CreateFileMapping / MapViewOfFile // length of 0 in CreateFileMapping / MapViewOfFile
// means map the entire file. // means map the entire file.
@ -89,10 +88,14 @@ void mapped_file_base::open(const path_type& p, mapmode flags, size_t length, si
auto fh_close = make_unique_resource(fh, CloseHandle); auto fh_close = make_unique_resource(fh, CloseHandle);
GetFileSizeEx(fh, &file_size);
if (length == -1) if (length == -1) {
LARGE_INTEGER file_size;
GetFileSizeEx(fh, &file_size);
length = file_size.QuadPart; length = file_size.QuadPart;
}
if (length == 0) return;
DWORD protect = 0; DWORD protect = 0;
DWORD access = 0; DWORD access = 0;
@ -232,7 +235,6 @@ void mapped_file_base::close() {
void mapped_file_base::open(const path_type& p, mapmode flags, size_t length, size_t offset) { void mapped_file_base::open(const path_type& p, mapmode flags, size_t length, size_t offset) {
int fd; int fd;
struct stat st;
int oflags = 0; int oflags = 0;
@ -257,12 +259,18 @@ void mapped_file_base::open(const path_type& p, mapmode flags, size_t length, si
//defer([fd](){::close(fd); }); //defer([fd](){::close(fd); });
auto close_fd = make_unique_resource(fd, ::close); auto close_fd = make_unique_resource(fd, ::close);
if (::fstat(fd, &st) < 0) {
throw_error(errno);
if (length == -1) {
struct stat st;
if (::fstat(fd, &st) < 0) {
throw_error(errno);
}
length = st.st_size;
} }
if (length == 0) return;
if (length == -1) length = st.st_size;
_data = ::mmap(0, length, _data = ::mmap(0, length,
flags == readonly ? PROT_READ : PROT_READ | PROT_WRITE, flags == readonly ? PROT_READ : PROT_READ | PROT_WRITE,