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win: mch_open_rw: specify S_IWRITE #6487

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On Windows, `mch_open_rw` is not actually doing what it claims. This
manifests as "E301: Oops, lost the swap file !!!" when filename is
changed with :file {name}.

Steps to reproduce (covered by test/functional/ex_cmds/file_spec.lua):
    nvim -u NONE
    :edit test
    :file test2
    E301 Oops, lost the swap file!!!

From libuv/src/win/fs.c:
    void fs__open(uv_fs_t* req) {
      ...
      attributes |= FILE_ATTRIBUTE_NORMAL;
      if (flags & _O_CREAT) {
        if (!((req->fs.info.mode & ~current_umask) & _S_IWRITE)) {
          attributes |= FILE_ATTRIBUTE_READONLY;
        }
      }
This commit is contained in:
erw7 2017-04-09 12:31:54 +09:00 committed by Justin M. Keyes
parent 2d29638744
commit 4a63d9e5f8
1 changed files with 3 additions and 1 deletions
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4
src/nvim/macros.h
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@ -120,8 +120,10 @@
/* mch_open_rw(): invoke os_open() with third argument for user R/W. */
#if defined(UNIX) /* open in rw------- mode */
# define mch_open_rw(n, f) os_open((n), (f), (mode_t)0600)
#elif defined(WIN32)
# define mch_open_rw(n, f) os_open((n), (f), S_IREAD | S_IWRITE)
#else
# define mch_open_rw(n, f) os_open((n), (f), 0)
# define mch_open_rw(n, f) os_open((n), (f), 0)
#endif
# define REPLACE_NORMAL(s) (((s) & REPLACE_FLAG) && !((s) & VREPLACE_FLAG))