Mercurial > hg > octave-lojdl > gnulib-hg
changeset 14600:f57a9fcc777a
passfd: speed up configure and drop unused code
Ultimately, it would be nice to provide a sendmsg and recvmsg module,
and have those provide a replacement struct msghdr and silently
convert msg_accrights into the replacement struct's msg_control, when
targeting older BSD. But until that point in time, this is a nice
cleanup.
SCM_RIGHTS really only works on Unix sockets; however, there is
nothing in passfd.c that needs to be hard-coded to this (rather,
the hard-coding of the address family is done externally when
the socket or socketpair is created).
* m4/afunix.m4 (gl_SOCKET_AFUNIX): Rename...
* m4/passfd.m4 (gl_PASSFD): ...to something more fitting of
its use. Drop test for setting unused HAVE_UNIXSOCKET_SCM_RIGHTS.
Instead of probing at configure for unix_scm_rights_bsd44_way,
instead probe for CMSG_FIRSTHDR at compile time. Simplify BSD 4.3
check to a struct member probe.
* lib/passfd.c (includes): Nothing here requires <sys/un.h>.
(sendfd, recvfd): Update preprocessor checks.
* modules/passfd (Files): Reflect rename, and drop unused file.
(Depends-on): Drop unused dependency.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Thu, 21 Apr 2011 11:48:22 -0600 |
parents | 2a40136b85ae |
children | ed598c7742aa |
files | ChangeLog lib/passfd.c m4/afunix.m4 m4/passfd.m4 modules/passfd |
diffstat | 5 files changed, 43 insertions(+), 130 deletions(-) [+] |
line wrap: on
line diff
--- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,17 @@ 2011-04-21 Eric Blake <eblake@redhat.com> + passfd: speed up configure and drop unused code + * m4/afunix.m4 (gl_SOCKET_AFUNIX): Rename... + * m4/passfd.m4 (gl_PASSFD): ...to something more fitting of + its use. Drop test for setting unused HAVE_UNIXSOCKET_SCM_RIGHTS. + Instead of probing at configure for unix_scm_rights_bsd44_way, + instead probe for CMSG_FIRSTHDR at compile time. Simplify BSD 4.3 + check to a struct member probe. + * lib/passfd.c (includes): Nothing here requires <sys/un.h>. + (sendfd, recvfd): Update preprocessor checks. + * modules/passfd (Files): Reflect rename, and drop unused file. + (Depends-on): Drop unused dependency. + passfd: allow compilation on mingw * modules/sys_socket (Depends-on): Add sys_uio. * lib/sys_socket.in.h [!@HAVE_SYS_SOCKET_H@]: Use it for struct
--- a/lib/passfd.c +++ b/lib/passfd.c @@ -27,9 +27,6 @@ #include <unistd.h> #include <sys/socket.h> -#if HAVE_SYS_UN_H -# include <sys/un.h> -#endif #include "cloexec.h" @@ -49,7 +46,7 @@ char send = 0; struct iovec iov; struct msghdr msg; -# if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY +# ifdef CMSG_FIRSTHDR struct cmsghdr *cmsg; char buf[CMSG_SPACE (sizeof fd)]; # endif @@ -63,7 +60,7 @@ msg.msg_name = NULL; msg.msg_namelen = 0; -# if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY +# ifdef CMSG_FIRSTHDR msg.msg_control = buf; msg.msg_controllen = sizeof buf; cmsg = CMSG_FIRSTHDR (&msg); @@ -72,7 +69,7 @@ cmsg->cmsg_len = CMSG_LEN (sizeof fd); /* Initialize the payload: */ memcpy (CMSG_DATA (cmsg), &fd, sizeof fd); -# elif HAVE_UNIXSOCKET_SCM_RIGHTS_BSD43_WAY +# elif HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS msg.msg_accrights = &fd; msg.msg_accrightslen = sizeof fd; # else @@ -107,7 +104,7 @@ struct iovec iov; struct msghdr msg; int fd = -1; -# if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY +# ifdef CMSG_FIRSTHDR struct cmsghdr *cmsg; char buf[CMSG_SPACE (sizeof fd)]; int flags_recvmsg = flags & O_CLOEXEC ? MSG_CMSG_CLOEXEC : 0; @@ -128,7 +125,7 @@ msg.msg_name = NULL; msg.msg_namelen = 0; -# if HAVE_UNIXSOCKET_SCM_RIGHTS_BSD44_WAY +# ifdef CMSG_FIRSTHDR msg.msg_control = buf; msg.msg_controllen = sizeof buf; cmsg = CMSG_FIRSTHDR (&msg); @@ -166,7 +163,7 @@ } } -# elif HAVE_UNIXSOCKET_SCM_RIGHTS_BSD43_WAY +# elif HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS msg.msg_accrights = &fd; msg.msg_accrightslen = sizeof fd; if (recvmsg (sock, &msg, 0) < 0)
deleted file mode 100644 --- a/m4/afunix.m4 +++ /dev/null @@ -1,117 +0,0 @@ -# afunix.m4 serial 7 -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_CHECK_FUNCS_ONCE([recvmsg sendmsg]) - - 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 -])
new file mode 100644 --- /dev/null +++ b/m4/passfd.m4 @@ -0,0 +1,23 @@ +# passfd.m4 serial 8 +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_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> + ]]) +])