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annotate m4/passfd.m4 @ 18070:d460ec17f09f

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author Karl Berry <karl@freefriends.org>
date Tue, 28 Jul 2015 13:57:32 -0700
parents ab58d4870664
children
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f57a9fcc777a passfd: speed up configure and drop unused code
Eric Blake <eblake@redhat.com>
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1 # passfd.m4 serial 8
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ab58d4870664 version-etc: new year
Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2011-2015 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_PASSFD],
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8 [
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9 AC_REQUIRE([gl_HEADER_SYS_SOCKET])
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10 AC_CHECK_FUNCS_ONCE([recvmsg sendmsg])
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11
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12 dnl Persuade AIX 5.2 <sys/socket.h> to declare CMSG_SPACE, CMSG_LEN.
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Eric Blake <eblake@redhat.com>
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13 dnl CMSG_FIRSTHDR is POSIX 2008, but CMSG_SPACE is only in RFC 3542.
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14 AC_DEFINE([_LINUX_SOURCE_COMPAT], [1],
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15 [Define in order to get some macros on AIX systems.])
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16
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17 dnl Passfd prefers the POSIX use of msg.msg_control if the CMSG_* macros
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18 dnl are present, but can fall back to BSD 4.3 style of msg.msg_accrights.
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19 AC_CHECK_MEMBERS([struct msghdr.msg_accrights], [], [], [[
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20 #include <sys/types.h>
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21 #include <sys/socket.h>
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22 ]])
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23 ])