passfd: Add comments.

* lib/passfd.c: Add comments about platforms.

diff --git a/ChangeLog b/ChangeLog
index 796a2ba10c74d49f79ff20c9f4ac4dd6181ad3f4..1c39c2566409fdf4d25b3c639907cd1be93afdff 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-04-30  Bruno Haible  <bruno@clisp.org>
+
+       passfd: Add comments.
+       * lib/passfd.c: Add comments about platforms.
+
 2011-04-30  Bruno Haible  <bruno@clisp.org>
 
        sys_uio: Make <sys/uio.h> self-contained.

diff --git a/lib/passfd.c b/lib/passfd.c
index 86c73760b5f15ff4bda3f34dd5ffa80719af92dc..945882045ee3a45800eb1e5c73a9fd04905e826c 100644 (file)
--- a/lib/passfd.c
+++ b/lib/passfd.c
@@ -30,6 +30,12 @@
 
 #include "cloexec.h"
 
+/* The code that uses CMSG_FIRSTHDR is enabled on
+   Linux, MacOS X, FreeBSD, OpenBSD, NetBSD, AIX, OSF/1, Cygwin.
+   The code that uses HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS is enabled on
+   HP-UX, IRIX, Solaris.  */
+
+/* MSG_CMSG_CLOEXEC is defined only on Linux, as of 2011.  */
 #ifndef MSG_CMSG_CLOEXEC
 # define MSG_CMSG_CLOEXEC 0
 #endif