[libvirt] [PATCH] build: improved handling of <execinfo.h>, BSD <net/if.h>
Daniel Veillard
veillard at redhat.com
Thu Sep 6 07:41:40 UTC 2012
On Wed, Sep 05, 2012 at 04:39:28PM -0600, Eric Blake wrote:
> FreeBSD and OpenBSD have a <net/if.h> that is not self-contained;
> and mingw lacks the header altogether. But gnulib has just taken
> care of that for us, so we might as well simplify our code. In
> the process, I got a syntax-check failure if we don't also take
> the gnulib execinfo module.
>
> * .gnulib: Update to latest, for execinfo and net_if.
> * bootstrap.conf (gnulib_modules): Add execinfo and net_if modules.
> * configure.ac: Let gnulib check for headers. Simplify check for
> 'struct ifreq', while also including enough prereq headers.
> * src/internal.h (IF_NAMESIZE): Drop, now that gnulib guarantees it.
> * src/nwfilter/nwfilter_learnipaddr.h: Use correct header for
> IF_NAMESIZE.
> * src/util/virnetdev.c (includes): Assume <net/if.h> exists.
> * src/util/virnetdevbridge.c (includes): Likewise.
> * src/util/virnetdevtap.c (includes): Likewise.
> * src/util/logging.c (includes): Assume <execinfo.h> exists.
> (virLogStackTraceToFd): Handle gnulib's fallback implementation.
> ---
>
> Successfully tested on Fedora and FreeBSD; I'm still trying to also
> test a cross-compile to mingw. Gnulib changes amount to:
>
> * .gnulib 271dd74...440a1db (36):
> > net_if: new module
> > readutmp: fix non-portable UT_PID use
> > update from texinfo
> > fts: reduce two or more trailing slashes to just one, usually
> > fts: when there is no risk of overlap, use memcpy, not memmove
> > autoupdate
> > autoupdate
> > manywarnings: update the list of "all" warnings
> > * lib/stdbool.in.h (_Bool) [__cplusplus]: bool, not _Bool.
> > stdbool: be more compatible with mixed C/C++ compiles
> > revert last change: it was not needed
> > tests: test-vc-list-files-git.sh: skip if git is not available
> > gnulib-tool: Remove no-op option --no-changelog.
> > autoupdate
> > doc: remove fdl-1.2.texi
> > execinfo: port to FreeBSD
> > xstrtol.h: avoid "_Noreturn is not at beginning of declaration" warning
> > doc: do not use @acronym
> > stdnoreturn: port to newer GCCs
> > pipe-filter: fix comment typo
> > execinfo: new module
> > extern-inline: support old GCC 'inline'
> > maint.mk: avoid redundant file name in message
> > timer-time: fix link order when static linking on glibc
> > timespec: omit unnecessary AC_C_INLINE
> > stat-time: omit unnecessary AC_C_INLINE
> > ignore-value: omit unnecessary AC_C_INLINE
> > sys_select: avoid 'static inline'
> > mktime: avoid 'static inline'
> > autoupdate
> > gnulib-tool: Improve coding style.
> > gnulib-tool: Fix indentation.
> > gnulib-tool: Remove old file names from .cvsignore, .gitignore.
> > test-parse-datetime: avoid glibc leap-second glitch
> > autoupdate
> > gnulib-tool: Fix indentation of generated gnulib-comp.m4 file.
>
> .gnulib | 2 +-
> bootstrap.conf | 2 ++
> configure.ac | 23 +++++++----------------
> src/internal.h | 4 ----
> src/nwfilter/nwfilter_learnipaddr.h | 2 ++
> src/util/logging.c | 22 +++++++++-------------
> src/util/virnetdev.c | 4 +---
> src/util/virnetdevbridge.c | 6 ++----
> src/util/virnetdevtap.c | 4 +---
> 9 files changed, 25 insertions(+), 44 deletions(-)
>
> diff --git a/.gnulib b/.gnulib
> index 271dd74..440a1db 160000
> --- a/.gnulib
> +++ b/.gnulib
> @@ -1 +1 @@
> -Subproject commit 271dd74fdf54ec2a03e73a5173b0b5697f6088f1
> +Subproject commit 440a1dbe523e37f206252cb034c3a62f26867e42
> diff --git a/bootstrap.conf b/bootstrap.conf
> index 7fefb69..2847c0b 100644
> --- a/bootstrap.conf
> +++ b/bootstrap.conf
> @@ -38,6 +38,7 @@ count-one-bits
> crypto/md5
> dirname-lgpl
> environ
> +execinfo
> fclose
> fcntl
> fcntl-h
> @@ -70,6 +71,7 @@ manywarnings
> mkstemp
> mkstemps
> mktempd
> +net_if
> netdb
> nonblocking
> openpty
> diff --git a/configure.ac b/configure.ac
> index cb91e7d..47a72b9 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -186,8 +186,7 @@ LIBS=$old_libs
> dnl Availability of various common headers (non-fatal if missing).
> AC_CHECK_HEADERS([pwd.h paths.h regex.h sys/un.h \
> sys/poll.h syslog.h mntent.h net/ethernet.h linux/magic.h \
> - sys/un.h sys/syscall.h netinet/tcp.h ifaddrs.h libtasn1.h \
> - net/if.h execinfo.h])
> + sys/un.h sys/syscall.h netinet/tcp.h ifaddrs.h libtasn1.h])
>
> dnl We need to decide at configure time if libvirt will use real atomic
> dnl operations ("lock free") or emulated ones with a mutex.
> @@ -245,20 +244,12 @@ AM_CONDITIONAL([WITH_ATOMIC_OPS_PTHREAD],[test "$atomic_ops" = "pthread"])
> AC_MSG_RESULT([$atomic_ops])
>
>
> -
> -AC_MSG_CHECKING([for struct ifreq in net/if.h])
> -AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
> - [[
> - #include <net/if.h>
> - ]],
> - [[
> - struct ifreq ifr;
> - ]])],[
> - AC_DEFINE([HAVE_STRUCT_IFREQ],[],[Defined if struct ifreq existsin net/if.h])
> - AC_MSG_RESULT([yes])
> - ],[
> - AC_MSG_RESULT([yes])
> - ])
> +AC_CHECK_TYPE([struct ifreq],
> + [AC_DEFINE([HAVE_STRUCT_IFREQ],[1],
> + [Defined if struct ifreq exists in net/if.h])],
> + [], [[#include <sys/socket.h>
> + #include <net/if.h>
> + ]])
>
> dnl Our only use of libtasn1.h is in the testsuite, and can be skipped
> dnl if the header is not present. Assume -ltasn1 is present if the
> diff --git a/src/internal.h b/src/internal.h
> index 02fdb8d..8037a4a 100644
> --- a/src/internal.h
> +++ b/src/internal.h
> @@ -58,10 +58,6 @@
> # define HOST_NAME_MAX 256
> # endif
>
> -# ifndef IF_NAMESIZE
> -# define IF_NAMESIZE 16
> -# endif
> -
> # ifndef INET_ADDRSTRLEN
> # define INET_ADDRSTRLEN 16
> # endif
> diff --git a/src/nwfilter/nwfilter_learnipaddr.h b/src/nwfilter/nwfilter_learnipaddr.h
> index 977b16d..f2ac85e 100644
> --- a/src/nwfilter/nwfilter_learnipaddr.h
> +++ b/src/nwfilter/nwfilter_learnipaddr.h
> @@ -2,6 +2,7 @@
> * nwfilter_learnipaddr.h: support for learning IP address used by a VM
> * on an interface
> *
> + * Copyright (C) 2012 Red Hat, Inc.
> * Copyright (C) 2010 IBM Corp.
> * Copyright (C) 2010 Stefan Berger
> *
> @@ -26,6 +27,7 @@
> # define __NWFILTER_LEARNIPADDR_H
>
> # include "conf/nwfilter_params.h"
> +# include <net/if.h>
>
> enum howDetect {
> DETECT_DHCP = 1,
> diff --git a/src/util/logging.c b/src/util/logging.c
> index a7f6b65..6048151 100644
> --- a/src/util/logging.c
> +++ b/src/util/logging.c
> @@ -31,12 +31,10 @@
> #include <fcntl.h>
> #include <unistd.h>
> #include <signal.h>
> +#include <execinfo.h>
> #if HAVE_SYSLOG_H
> # include <syslog.h>
> #endif
> -#ifdef HAVE_EXECINFO_H
> -# include <execinfo.h>
> -#endif
>
> #include "virterror_internal.h"
> #include "logging.h"
> @@ -792,23 +790,21 @@ cleanup:
>
> static void virLogStackTraceToFd(int fd)
> {
> -#ifdef HAVE_EXECINFO_H
> void *array[100];
> int size;
> -
> -# define STRIP_DEPTH 3
> -
> - size = backtrace(array, ARRAY_CARDINALITY(array));
> - backtrace_symbols_fd(array + STRIP_DEPTH, size - STRIP_DEPTH, fd);
> - ignore_value(safewrite(fd, "\n", 1));
> -#else
> static bool doneWarning = false;
> const char *msg = "Stack trace not available on this platform\n";
> - if (!doneWarning) {
> +
> +#define STRIP_DEPTH 3
> + size = backtrace(array, ARRAY_CARDINALITY(array));
> + if (size) {
> + backtrace_symbols_fd(array + STRIP_DEPTH, size - STRIP_DEPTH, fd);
> + ignore_value(safewrite(fd, "\n", 1));
> + } else if (!doneWarning) {
> ignore_value(safewrite(fd, msg, strlen(msg)));
> doneWarning = true;
> }
> -#endif
> +#undef STRIP_DEPTH
> }
>
> static int virLogOutputToFd(const char *category ATTRIBUTE_UNUSED,
> diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
> index d97820e..f622f5d 100644
> --- a/src/util/virnetdev.c
> +++ b/src/util/virnetdev.c
> @@ -32,9 +32,7 @@
> #include "logging.h"
>
> #include <sys/ioctl.h>
> -#ifdef HAVE_NET_IF_H
> -# include <net/if.h>
> -#endif
> +#include <net/if.h>
> #include <fcntl.h>
>
> #ifdef __linux__
> diff --git a/src/util/virnetdevbridge.c b/src/util/virnetdevbridge.c
> index a29e4b2..4efb98d 100644
> --- a/src/util/virnetdevbridge.c
> +++ b/src/util/virnetdevbridge.c
> @@ -31,10 +31,8 @@
>
> #include <sys/ioctl.h>
> #include <sys/socket.h>
> +#include <net/if.h>
>
> -#ifdef HAVE_NET_IF_H
> -# include <net/if.h>
> -#endif
> #ifdef __linux__
> # include <linux/sockios.h>
> # include <linux/param.h> /* HZ */
> @@ -47,7 +45,7 @@
> #define VIR_FROM_THIS VIR_FROM_NONE
>
>
> -#if defined(HAVE_NET_IF_H) && defined(SIOCBRADDBR)
> +#ifdef SIOCBRADDBR
> static int virNetDevSetupControlFull(const char *ifname,
> struct ifreq *ifr,
> int domain,
> diff --git a/src/util/virnetdevtap.c b/src/util/virnetdevtap.c
> index 24f30b5..37e91d0 100644
> --- a/src/util/virnetdevtap.c
> +++ b/src/util/virnetdevtap.c
> @@ -35,9 +35,7 @@
> #include "util.h"
>
> #include <sys/ioctl.h>
> -#ifdef HAVE_NET_IF_H
> -# include <net/if.h>
> -#endif
> +#include <net/if.h>
> #include <fcntl.h>
> #ifdef __linux__
> # include <linux/if_tun.h> /* IFF_TUN, IFF_NO_PI */
ACK, let's push that sooner than later :-)
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
daniel at veillard.com | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library http://libvirt.org/
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