| # passfd.m4 | |
| # serial 10 | |
| dnl Copyright (C) 2011-2026 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. | |
| dnl This file is offered as-is, without any warranty. | |
| AC_DEFUN([gl_PASSFD], | |
| [ | |
| AC_REQUIRE([gl_SYS_SOCKET_H]) | |
| 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 so that AIX headers are more compatible with GNU/Linux.]) | |
| 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> | |
| ]]) | |
| ]) |