bug#25923: pkgsrc patches: improve mkostemp support

[Thomas Klausner <tk@giga.or.at>]

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And the final pkgsrc patch tries to use only the flags for mkostemp
that are supported on the operating system, in particular for Darwin
and NetBSD.

Please merge this one as well.

Thanks,
 Thomas

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$NetBSD: patch-libguile_filesys.c,v 1.3 2017/02/21 15:55:28 gdt Exp $

When using mkostemp (an interface not defined by POSIX), restrict
flags to the set defined by the documentation of particular operating
systems.

See https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24862#23 for discussion.

This patch has not yet been sent upstream.

--- libguile/filesys.c.orig	2016-12-15 00:03:33.000000000 +0000
+++ libguile/filesys.c
@@ -1486,6 +1486,15 @@ SCM_DEFINE (scm_i_mkstemp, "mkstemp!", 1
       mode_bits = scm_i_mode_bits (mode);
     }
 
+#ifdef __APPLE__
+  /* https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24862#23 */
+  open_flags &= O_APPEND|O_SHLOCK|O_EXLOCK|O_CLOEXEC;
+#endif
+#ifdef __NetBSD__
+  /* Restrict to list of flags documented in man page. */
+  open_flags &= O_APPEND|O_DIRECT|O_SHLOCK|O_EXLOCK|O_SYNC|O_CLOEXEC;
+#endif
+
   SCM_SYSCALL (rv = mkostemp (c_tmpl, open_flags));
   if (rv == -1)
     SCM_SYSERROR;