| # passfd.m4 serial 8 |
| dnl Copyright (C) 2011-2020 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| AC_DEFUN([gl_PASSFD], |
| [ |
| AC_REQUIRE([gl_HEADER_SYS_SOCKET]) |
| AC_CHECK_FUNCS_ONCE([recvmsg sendmsg]) |
| |
| dnl Persuade AIX 5.2 <sys/socket.h> to declare CMSG_SPACE, CMSG_LEN. |
| dnl CMSG_FIRSTHDR is POSIX 2008, but CMSG_SPACE is only in RFC 3542. |
| AC_DEFINE([_LINUX_SOURCE_COMPAT], [1], |
| [Define in order to get some macros on AIX systems.]) |
| |
| dnl Passfd prefers the POSIX use of msg.msg_control if the CMSG_* macros |
| dnl are present, but can fall back to BSD 4.3 style of msg.msg_accrights. |
| AC_CHECK_MEMBERS([struct msghdr.msg_accrights], [], [], [[ |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| ]]) |
| ]) |
