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# afunix.m4 serial 5
dnl Copyright (C) 2011 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_SOCKET_AFUNIX],
[
AC_REQUIRE([gl_HEADER_SYS_SOCKET])
AC_REQUIRE([gl_SOCKET_FAMILY_UNIX])
AC_MSG_CHECKING([for UNIX domain sockets SCM_RIGHTS])
AC_CACHE_VAL([gl_cv_socket_unix_scm_rights],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
]],
[[struct cmsghdr cmh;
cmh.cmsg_level = SOL_SOCKET;
cmh.cmsg_type = SCM_RIGHTS;
if (&cmh) return 0;
]])],
[gl_cv_socket_unix_scm_rights=yes],
[gl_cv_socket_unix_scm_rights=no])
])
AC_MSG_RESULT([$gl_cv_socket_unix_scm_rights])
if test $gl_cv_socket_unix_scm_rights = yes; then
AC_DEFINE([HAVE_UNIXSOCKET_SCM_RIGHTS], [1],
[Define to 1 if <sys/socket.h> defines SCM_RIGHTS.])
fi
dnl Persuade AIX 5.2 <sys/socket.h> to declare CMSG_SPACE, CMSG_LEN.
AC_DEFINE([_LINUX_SOURCE_COMPAT], [1],
[Define in order to get some macros on AIX systems.])
AC_MSG_CHECKING([for UNIX domain sockets SCM_RIGHTS that behave in BSD4.4 way])
AC_CACHE_VAL([gl_cv_socket_unix_scm_rights_bsd44_way],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#include <stddef.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
]],
[[struct msghdr msg = {0};
struct cmsghdr *cmsg;
int myfds[1] = {0};
char buf[CMSG_SPACE (sizeof (myfds))];
msg.msg_control = buf;
msg.msg_controllen = sizeof buf;
cmsg = CMSG_FIRSTHDR (&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN (sizeof (int));
/* fake Initialize the payload: */
(void) CMSG_DATA (cmsg);
/* Sum of the length of all control messages in the buffer: */
msg.msg_controllen = cmsg->cmsg_len;
return 0;
]])],
[gl_cv_socket_unix_scm_rights_bsd44_way=yes],
[gl_cv_socket_unix_scm_rights_bsd44_way=no])
])
AC_MSG_RESULT([$gl_cv_socket_unix_scm_rights_bsd44_way])
if test $gl_cv_socket_unix_scm_rights_bsd44_way = yes; then
AC_DEFINE([HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY], [1],
[Define to 1 if fd can be sent/received in the BSD4.4 way.])
fi
AC_MSG_CHECKING([for UNIX domain sockets SCM_RIGHTS that behave in BSD4.3 way])
AC_CACHE_VAL([gl_cv_socket_unix_scm_rights_bsd43_way],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
]],
[[struct msghdr msg;
int fd = 0;
msg.msg_accrights = &fd;
msg.msg_accrightslen = sizeof (fd);
if (&msg) return 0;
]])],
[gl_cv_socket_unix_scm_rights_bsd43_way=yes],
[gl_cv_socket_unix_scm_rights_bsd43_way=no])
])
AC_MSG_RESULT([$gl_cv_socket_unix_scm_rights_bsd43_way])
if test $gl_cv_socket_unix_scm_rights_bsd43_way = yes; then
AC_DEFINE([HAVE_UNIXSOCKET_SCM_RIGHTS_BSD43_WAY], [1],
[Define to 1 if fd can be sent/received in the BSD4.3 way.])
fi
AC_MSG_CHECKING([for UNIX domain sockets recvmsg() MSG_CMSG_CLOEXEC flag])
AC_CACHE_VAL([gl_cv_socket_unix_msg_cmsg_cloexec],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
]],
[[int flags = MSG_CMSG_CLOEXEC;
if (&flags) return 0;
]])],
[gl_cv_socket_unix_msg_cmsg_cloexec=yes],
[gl_cv_socket_unix_msg_cmsg_cloexec=no])
])
AC_MSG_RESULT([$gl_cv_socket_unix_msg_cmsg_cloexec])
if test $gl_cv_socket_unix_msg_cmsg_cloexec = yes; then
AC_DEFINE([HAVE_MSG_CMSG_CLOEXEC], [1],
[Define to 1 if recvmsg could be specified with MSG_CMSG_CLOEXEC.])
fi
])
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