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https://github.com/moparisthebest/curl
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William Ahern:
Make UDP sockets non-blocking. I've confirmed that at least on Linux 2.4 a read event can come back from poll() on a valid SOCK_DGRAM socket but recv(2) will still block. This patch doesn't ignore EAGAIN in read_udp_packets(), though maybe it should. (This patch was edited by Daniel Stenberg and a new configure test was added (imported from curl's configure) to properly detect what non-blocking socket approach to use.)
This commit is contained in:
Daniel Stenberg
parent
050bd7dd0b
commit
5470b9aa73
@ -4,6 +4,13 @@
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- William Ahern:
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Make UDP sockets non-blocking. I've confirmed that at least on Linux 2.4 a
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read event can come back from poll() on a valid SOCK_DGRAM socket but
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recv(2) will still block. This patch doesn't ignore EAGAIN in
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read_udp_packets(), though maybe it should. (This patch was edited by Daniel
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Stenberg and a new configure test was added (imported from curl's configure)
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to properly detect what non-blocking socket approach to use.)
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I'm not quite sure how this was happening, but I've been seeing PTR queries
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which seem to return empty responses. At least, they were empty when calling
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ares_expand_name() on the record. Here's a patch which guarantees to
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@ -1,3 +1,126 @@
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dnl Check for how to set a socket to non-blocking state. There seems to exist
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dnl four known different ways, with the one used almost everywhere being POSIX
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dnl and XPG3, while the other different ways for different systems (old BSD,
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dnl Windows and Amiga).
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dnl
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dnl There are two known platforms (AIX 3.x and SunOS 4.1.x) where the
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dnl O_NONBLOCK define is found but does not work. This condition is attempted
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dnl to get caught in this script by using an excessive number of #ifdefs...
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dnl
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AC_DEFUN([CURL_CHECK_NONBLOCKING_SOCKET],
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[
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AC_MSG_CHECKING([non-blocking sockets style])
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AC_TRY_COMPILE([
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/* headers for O_NONBLOCK test */
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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],[
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/* try to compile O_NONBLOCK */
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#if defined(sun) || defined(__sun__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
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# if defined(__SVR4) || defined(__srv4__)
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# define PLATFORM_SOLARIS
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# else
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# define PLATFORM_SUNOS4
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# endif
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#endif
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#if (defined(_AIX) || defined(__xlC__)) && !defined(_AIX4)
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# define PLATFORM_AIX_V3
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#endif
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#if defined(PLATFORM_SUNOS4) || defined(PLATFORM_AIX_V3) || defined(__BEOS__)
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#error "O_NONBLOCK does not work on this platform"
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#endif
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int socket;
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int flags = fcntl(socket, F_SETFL, flags | O_NONBLOCK);
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],[
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dnl the O_NONBLOCK test was fine
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nonblock="O_NONBLOCK"
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AC_DEFINE(HAVE_O_NONBLOCK, 1, [use O_NONBLOCK for non-blocking sockets])
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],[
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dnl the code was bad, try a different program now, test 2
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AC_TRY_COMPILE([
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/* headers for FIONBIO test */
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#include <unistd.h>
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#include <stropts.h>
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],[
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/* FIONBIO source test (old-style unix) */
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int socket;
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int flags = ioctl(socket, FIONBIO, &flags);
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],[
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dnl FIONBIO test was good
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nonblock="FIONBIO"
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AC_DEFINE(HAVE_FIONBIO, 1, [use FIONBIO for non-blocking sockets])
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],[
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dnl FIONBIO test was also bad
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dnl the code was bad, try a different program now, test 3
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AC_TRY_COMPILE([
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/* headers for ioctlsocket test (cygwin?) */
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#include <windows.h>
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],[
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/* ioctlsocket source code */
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int socket;
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unsigned long flags = ioctlsocket(socket, FIONBIO, &flags);
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],[
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dnl ioctlsocket test was good
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nonblock="ioctlsocket"
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AC_DEFINE(HAVE_IOCTLSOCKET, 1, [use ioctlsocket() for non-blocking sockets])
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],[
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dnl ioctlsocket didnt compile!, go to test 4
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AC_TRY_LINK([
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/* headers for IoctlSocket test (Amiga?) */
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#include <sys/ioctl.h>
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],[
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/* IoctlSocket source code */
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int socket;
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int flags = IoctlSocket(socket, FIONBIO, (long)1);
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],[
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dnl ioctlsocket test was good
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nonblock="IoctlSocket"
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AC_DEFINE(HAVE_IOCTLSOCKET_CASE, 1, [use Ioctlsocket() for non-blocking sockets])
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],[
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dnl Ioctlsocket didnt compile, do test 5!
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AC_TRY_COMPILE([
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/* headers for SO_NONBLOCK test (BeOS) */
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#include <socket.h>
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],[
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/* SO_NONBLOCK source code */
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long b = 1;
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int socket;
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int flags = setsockopt(socket, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b));
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],[
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dnl the SO_NONBLOCK test was good
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nonblock="SO_NONBLOCK"
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AC_DEFINE(HAVE_SO_NONBLOCK, 1, [use SO_NONBLOCK for non-blocking sockets])
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],[
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dnl test 5 didnt compile!
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nonblock="nada"
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AC_DEFINE(HAVE_DISABLED_NONBLOCKING, 1, [disabled non-blocking sockets])
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])
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dnl end of fifth test
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])
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dnl end of forth test
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])
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dnl end of third test
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])
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dnl end of second test
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])
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dnl end of non-blocking try-compile test
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AC_MSG_RESULT($nonblock)
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if test "$nonblock" = "nada"; then
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AC_MSG_WARN([non-block sockets disabled])
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fi
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])
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dnl We create a function for detecting which compiler we use and then set as
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dnl pendantic compiler options as possible for that particular compiler. The
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@ -466,13 +466,76 @@ void ares__send_query(ares_channel channel, struct query *query, time_t now)
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}
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}
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/*
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* nonblock() set the given socket to either blocking or non-blocking mode
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* based on the 'nonblock' boolean argument. This function is highly portable.
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*/
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static int nonblock(ares_socket_t sockfd, /* operate on this */
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int nonblock /* TRUE or FALSE */)
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{
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#undef SETBLOCK
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#define SETBLOCK 0
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#ifdef HAVE_O_NONBLOCK
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/* most recent unix versions */
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int flags;
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flags = fcntl(sockfd, F_GETFL, 0);
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if (TRUE == nonblock)
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return fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
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else
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return fcntl(sockfd, F_SETFL, flags & (~O_NONBLOCK));
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#undef SETBLOCK
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#define SETBLOCK 1
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#endif
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#if defined(HAVE_FIONBIO) && (SETBLOCK == 0)
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/* older unix versions */
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int flags;
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flags = nonblock;
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return ioctl(sockfd, FIONBIO, &flags);
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#undef SETBLOCK
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#define SETBLOCK 2
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#endif
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#if defined(HAVE_IOCTLSOCKET) && (SETBLOCK == 0)
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/* Windows? */
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unsigned long flags;
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flags = nonblock;
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return ioctlsocket(sockfd, FIONBIO, &flags);
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#undef SETBLOCK
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#define SETBLOCK 3
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#endif
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#if defined(HAVE_IOCTLSOCKET_CASE) && (SETBLOCK == 0)
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/* presumably for Amiga */
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return IoctlSocket(sockfd, FIONBIO, (long)nonblock);
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#undef SETBLOCK
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#define SETBLOCK 4
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#endif
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#if defined(HAVE_SO_NONBLOCK) && (SETBLOCK == 0)
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/* BeOS */
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long b = nonblock ? 1 : 0;
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return setsockopt(sockfd, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b));
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#undef SETBLOCK
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#define SETBLOCK 5
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#endif
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#ifdef HAVE_DISABLED_NONBLOCKING
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return 0; /* returns success */
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#undef SETBLOCK
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#define SETBLOCK 6
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#endif
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#if (SETBLOCK == 0)
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#error "no non-blocking method was found/used/set"
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#endif
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}
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static int open_tcp_socket(ares_channel channel, struct server_state *server)
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{
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#if defined(WIN32)
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u_long flags;
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#else
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int flags;
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#endif
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ares_socket_t s;
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struct sockaddr_in sockin;
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@ -482,25 +545,7 @@ static int open_tcp_socket(ares_channel channel, struct server_state *server)
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return -1;
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/* Set the socket non-blocking. */
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#if defined(WIN32) || defined(WATT32)
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flags = 1;
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ioctlsocket(s, FIONBIO, &flags);
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#else
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flags = fcntl(s, F_GETFL, 0);
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if (flags == -1)
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{
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closesocket(s);
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return -1;
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}
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flags |= O_NONBLOCK;
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if (fcntl(s, F_SETFL, flags) == -1)
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{
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closesocket(s);
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return -1;
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}
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#endif
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nonblock(s, TRUE);
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/* Connect to the server. */
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memset(&sockin, 0, sizeof(sockin));
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@ -531,6 +576,9 @@ static int open_udp_socket(ares_channel channel, struct server_state *server)
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if (s == ARES_SOCKET_BAD)
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return -1;
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/* Set the socket non-blocking. */
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nonblock(s, TRUE);
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/* Connect to the server. */
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memset(&sockin, 0, sizeof(sockin));
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sockin.sin_family = AF_INET;
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@ -328,5 +328,6 @@ AC_CHECK_SIZEOF(struct in_addr, ,
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AC_CHECK_FUNCS([bitncmp if_indextoname])
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CURL_CHECK_NONBLOCKING_SOCKET
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AC_OUTPUT(Makefile)
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