(perl #134221) support O_APPEND for open ..., undef on VMS

VMS doesn't allow you to delete an open file like POSIXish systems
do, but you can mark a file to be deleted once it's closed, but
only when you open it.

Since VMS doesn't (yet) have mkostemp() we can add our own flag to
our mkostemp() emulation to pass the necessary magic to open() call
to delete the file on close.

1 files changed, 6 insertions, 4 deletions

diff --git a/perlio.c b/perlio.c
index 81ebc156ad..805959f840 100644
--- a/perlio.c
+++ b/perlio.c
@@ -5062,7 +5062,7 @@ PerlIO_tmpfile_flags(int imode)
      const int fd = win32_tmpfd_mode(imode);
      if (fd >= 0)
 	  f = PerlIO_fdopen(fd, "w+b");
-#elif ! defined(VMS) && ! defined(OS2)
+#elif ! defined(OS2)
      int fd = -1;
      char tempname[] = "/tmp/PerlIO_XXXXXX";
      const char * const tmpdir = TAINTING_get ? NULL : PerlEnv_getenv("TMPDIR");
@@ -5073,19 +5073,19 @@ PerlIO_tmpfile_flags(int imode)
 	 /* if TMPDIR is set and not empty, we try that first */
 	 sv = newSVpv(tmpdir, 0);
 	 sv_catpv(sv, tempname + 4);
-	 fd = Perl_my_mkostemp_cloexec(SvPVX(sv), imode);
+	 fd = Perl_my_mkostemp_cloexec(SvPVX(sv), imode | O_VMS_DELETEONCLOSE);
      }
      if (fd < 0) {
 	 SvREFCNT_dec(sv);
 	 sv = NULL;
 	 /* else we try /tmp */
-	 fd = Perl_my_mkostemp_cloexec(tempname, imode);
+	 fd = Perl_my_mkostemp_cloexec(tempname, imode | O_VMS_DELETEONCLOSE);
      }
      if (fd < 0) {
          /* Try cwd */
          sv = newSVpvs(".");
          sv_catpv(sv, tempname + 4);
-         fd = Perl_my_mkostemp_cloexec(SvPVX(sv), imode);
+         fd = Perl_my_mkostemp_cloexec(SvPVX(sv), imode | O_VMS_DELETEONCLOSE);
      }
      umask(old_umask);
      if (fd >= 0) {
@@ -5096,7 +5096,9 @@ PerlIO_tmpfile_flags(int imode)
          f = PerlIO_fdopen(fd, mode);
 	  if (f)
 	       PerlIOBase(f)->flags |= PERLIO_F_TEMP;
+#   ifndef VMS
 	  PerlLIO_unlink(sv ? SvPVX_const(sv) : tempname);
+#   endif
      }
      SvREFCNT_dec(sv);
 #else	/* !HAS_MKSTEMP, fallback to stdio tmpfile(). */