From: "PAULUS, Raimund, TI-ABN" <Raimund.Paulus@dillinger.biz>
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Subject: Re: RPC clnt_create() adress already in use
Date: Fri, 29 Sep 2017 09:52:00 -0000 [thread overview]
Message-ID: <59D90AF8D70E9740907BACDE2BCB52083663B2F2@RESW102.resdom01.local> (raw)
Hello Mark,
i downloaded the sources of libtirpc from this url: https://sourceforge.net/projects/libtirpc/files/libtirpc/1.0.1/ and unpacked it in the local subdirectory libtirpc-1.0.1.
I had to make the following changes:
libtirpc-1.0.1/src/clnt_bcast.c (because POLLRDNORM, POLLRDBAND are already defined in /usr/include/sys/poll.h) :
--> #ifndef POLLRDNORM
--> # define POLLRDNORM 0x040 /* Normal data may be read. */
--> # define POLLRDBAND 0x080 /* Priority data may be read. */
--> #endif
libtirpc-1.0.1/tirpc/rpc/xdr.h (typedefs where missed):
--> #include <rpc/types.h>
--> typedef __uint64_t u_quad_t;
--> typedef __int64_t quad_t;
I linked the necessary source files with my testprogram:
gcc -D__GLIBC__ -D__linux__ -I/c/dh-progs/tstdir/libtirpc-1.0.1/tirpc \
tst_rpc.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/clnt_bcast.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/clnt_dg.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/clnt_generic.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/clnt_perror.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/clnt_vc.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/rpc_callmsg.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/rpc_commondata.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/rpc_generic.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/rpc_prot.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/rpcb_clnt.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/rpcb_prot.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/xdr.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/xdr_array.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/xdr_mem.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/xdr_rec.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/xdr_reference.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/getnetconfig.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/getnetpath.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/auth_none.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/auth_unix.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/authunix_prot.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/mt_misc.c \
/c/dh-progs/tstdir/libtirpc-1.0.1/src/debug.c \
-o tst_rpc-libtirpc-1-0-1
The program works perfectly (no errors is test cases 1 and 2).
I assume, there must be a difference between the downloaded lib-files and the Cygwin-libtirpc.
Raimund Paulus
-----Ursprüngliche Nachricht-----
Von: cygwin-owner@cygwin.com [mailto:cygwin-owner@cygwin.com] Im Auftrag von Mark Geisert
Gesendet: Mittwoch, 27. September 2017 11:50
An: cygwin@cygwin.com
Betreff: Re: RPC clnt_create() adress already in use
Hello Raimund,
Let's keep this on the mailing list please.
PAULUS, Raimund, TI-ABN wrote:
> Hallo Mark Geisert,
>
> many thanks for your answer. I supposed this too.
>
> I included in my source code the following function calls after clnt_create():
>
> int fd = 0;
> bool bool_ret = clnt_control(cl, CLGET_FD, &fd); if(bool_ret == true) {
> printf("fd: %d\n", fd);
>
> int enable = 1;
> retval = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int));
> if(retval < 0)
> fprintf(stderr, "Fehler setsockopt(): %s\n", strerror(errno)); }
>
> The function clnt_control() delivers the socket of the RPC-Client-Handle.
> The result is the same as before. Moreover i think, the effect of setsockopt() would be valid only during the process is running (my test scenarios 1 and 2).
> But it wouldn't change anything regarding my test scenario 3 (several restarts).
>
> Raimund
I looked through the libtirpc source code and nowhere is SO_REUSEADDR being set.
You are on the right track with how to do it, but by the time clnt_create() returns to you it is already too late. As far as I can tell there is no way to get access to the socket between the time it's created within libtirpc and the time it's made available to you by clnt_create().
I did try running your testcase (thanks for supplying that) but I don't have a local machine running RPC services and don't wish to poke at random machines on the Internet ;-). I had to compile it as so:
gcc -g -o test_rpc -I/usr/include/tirpc test_rpc.c -ltirpc You are taking care to compile against the correct RPC-package includes and link against the correct RPC-package libraries, yes?
Speculation: There might be a way to decompose what clnt_create() does into other libtirpc functions that accomplish the same thing, but in smaller pieces such that you could set the socket option before bind() is called. That would be a fair amount of work though and given my cursory look at the source I don't know if it's even possible.
..mark
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next reply other threads:[~2017-09-29 8:26 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-29 9:52 PAULUS, Raimund, TI-ABN [this message]
2017-09-29 17:36 ` Mark Geisert
2017-11-21 12:35 ` WG: " PAULUS, Raimund, TI-ABN
2017-11-22 21:54 ` Mark Geisert
-- strict thread matches above, loose matches on Subject: below --
2018-03-08 11:44 PAULUS, Raimund, TI-ABN
2018-03-08 15:24 ` Corinna Vinschen
2018-03-08 23:00 ` Mark Geisert
2018-03-02 10:39 PAULUS, Raimund, TI-ABN
2018-02-27 9:54 PAULUS, Raimund, TI-ABN
2018-02-27 10:37 ` Corinna Vinschen
2018-02-28 6:00 ` Mark Geisert
2018-02-06 11:29 PAULUS, Raimund, TI-ABN
2018-02-06 14:20 ` Corinna Vinschen
2018-02-07 6:54 ` Mark Geisert
2018-02-05 14:58 PAULUS, Raimund, TI-ABN
2018-02-05 8:19 PAULUS, Raimund, TI-ABN
2018-02-05 10:29 ` Mark Geisert
2018-02-05 11:26 ` Corinna Vinschen
2018-02-05 13:34 ` Corinna Vinschen
2018-02-05 14:06 ` Corinna Vinschen
2018-02-05 20:15 ` Corinna Vinschen
2018-02-02 12:58 PAULUS, Raimund, TI-ABN
2018-01-30 10:07 PAULUS, Raimund, TI-ABN
2018-01-31 8:15 ` Mark Geisert
2018-01-31 9:11 ` Corinna Vinschen
2018-01-31 9:35 ` Mark Geisert
2018-02-02 8:11 ` Mark Geisert
2018-01-30 7:01 PAULUS, Raimund, TI-ABN
2018-01-30 9:05 ` Mark Geisert
2017-12-19 16:13 PAULUS, Raimund, TI-ABN
2017-12-28 0:03 ` Mark Geisert
2017-09-27 12:51 PAULUS, Raimund, TI-ABN
2017-09-25 6:44 PAULUS, Raimund, TI-ABN
2017-09-27 9:50 ` Mark Geisert
2017-09-22 7:22 PAULUS, Raimund, TI-ABN
2017-09-24 9:49 ` Mark Geisert
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