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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy and Pascal Cuoq, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/osdeps.h>
#include <caml/memory.h>
#include "caml/unixsupport.h"
#include <fcntl.h>
static const int open_access_flags[15] = {
GENERIC_READ, GENERIC_WRITE, GENERIC_READ|GENERIC_WRITE,
0, FILE_APPEND_DATA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const int open_create_flags[15] = {
0, 0, 0, 0, 0, O_CREAT, O_TRUNC, O_EXCL, 0, 0, 0, 0, 0, 0, 0
};
static const int open_share_flags[15] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, FILE_SHARE_DELETE, 0, 0
};
enum { CLOEXEC = 1, KEEPEXEC = 2 };
static const int open_cloexec_flags[15] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CLOEXEC, KEEPEXEC
};
CAMLprim value caml_unix_open(value path, value flags, value perm)
{
int fileaccess, createflags, fileattrib, filecreate, sharemode, cloexec;
SECURITY_ATTRIBUTES attr;
HANDLE h;
DWORD dwMoved;
wchar_t * wpath;
caml_unix_check_path(path, "open");
fileaccess = caml_convert_flag_list(flags, open_access_flags);
sharemode = FILE_SHARE_READ | FILE_SHARE_WRITE
| caml_convert_flag_list(flags, open_share_flags);
createflags = caml_convert_flag_list(flags, open_create_flags);
if ((createflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
filecreate = CREATE_NEW;
else if ((createflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
filecreate = CREATE_ALWAYS;
else if (createflags & O_TRUNC)
filecreate = TRUNCATE_EXISTING;
else if (createflags & O_CREAT)
filecreate = OPEN_ALWAYS;
else
filecreate = OPEN_EXISTING;
if ((createflags & O_CREAT) && (Int_val(perm) & 0200) == 0)
fileattrib = FILE_ATTRIBUTE_READONLY;
else
fileattrib = FILE_ATTRIBUTE_NORMAL;
cloexec = caml_convert_flag_list(flags, open_cloexec_flags);
attr.nLength = sizeof(attr);
attr.lpSecurityDescriptor = NULL;
attr.bInheritHandle =
cloexec & CLOEXEC ? FALSE
: cloexec & KEEPEXEC ? TRUE
: !caml_unix_cloexec_default;
wpath = caml_stat_strdup_to_utf16(String_val(path));
h = CreateFile(wpath, fileaccess,
sharemode, &attr,
filecreate, fileattrib, NULL);
caml_stat_free(wpath);
if (h == INVALID_HANDLE_VALUE) {
caml_win32_maperr(GetLastError());
caml_uerror("open", path);
}
if (fileaccess & FILE_APPEND_DATA) {
dwMoved = SetFilePointer(h, 0, NULL, FILE_END);
if (dwMoved == INVALID_SET_FILE_POINTER) {
caml_win32_maperr(GetLastError());
CloseHandle(h);
caml_uerror("open", path);
}
}
return caml_win32_alloc_handle(h);
}
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