pg.ddx.io pgsql-interfaces@postgresql.org mailing list archive help / color / mirror / Atom feed From: Volkan YAZICI <yazicivo@ttnet.net.tr>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-interfaces@postgresql.org
Subject: Re: Receiving SIGPIPE for PQfinish(<broken-connection>)
Date: Mon, 13 Mar 2006 17:55:31 +0200
Message-ID: <20060313155531.GA191@alamut> (raw )
In-Reply-To: <29861.1142180334@sss.pgh.pa.us >
References: <20060312112803.GA490@alamut >
<29861.1142180334@sss.pgh.pa.us >
On Mar 12 11:18, Tom Lane wrote:
> pqsecure_write should have disabled SIGPIPE already. You should look
> into why that is seemingly not working.
When I omit --enable-thread-safety, code doesn't handle in the case of
a SIG_ERR return on the call to pqsignal() made from pqsecure_write().
Furthermore, I still couldn't figure out why pqsignal() cannot handle
SIGPIPE - despite pqsignal() doesn't return SIG_ERR. (A related small
debug output is attached.)
Everything works fine when thread safety is enabled.
Regards.
Breakpoint 5, PQfinish (conn=0x0) at fe-connect.c:2030
2030 {
# Shutdown postmaster in here.
(gdb) c
Continuing.
Breakpoint 6, pqsecure_write (conn=0x804e208, ptr=0x804e208,
len=134537736) at fe-secure.c:406
406 pqsigfunc oldsighandler = pqsignal(SIGPIPE,
SIG_IGN);
(gdb) n
393 {
(gdb)
406 pqsigfunc oldsighandler = pqsignal(SIGPIPE,
SIG_IGN);
(gdb)
Breakpoint 4, pqsignal (signo=5, func=0x804e208) at pqsignal.c:35
35 act.sa_handler = func;
(gdb)
28 {
(gdb)
35 act.sa_handler = func;
(gdb)
36 sigemptyset(&act.sa_mask);
(gdb)
28 {
(gdb)
36 sigemptyset(&act.sa_mask);
(gdb)
28 {
(gdb)
36 sigemptyset(&act.sa_mask);
(gdb)
38 if (signo != SIGALRM)
(gdb)
42 act.sa_flags |= SA_NOCLDSTOP;
(gdb)
44 if (sigaction(signo, &act, &oact) < 0)
(gdb)
50 return oact.sa_handler;
(gdb)
52 }
(gdb)
pqsecure_write (conn=0x0, ptr=0x0, len=0) at fe-secure.c:480
480 n = send(conn->sock, ptr, len, 0);
(gdb)
Program received signal SIGPIPE, Broken pipe.
0xffffe410 in ?? ()
(gdb)
Attachments:
[text/plain] pqsignal.gdb (1.2K, ../20060313155531.GA191@alamut/2-pqsignal.gdb)
download | inline:
Breakpoint 5, PQfinish (conn=0x0) at fe-connect.c:2030
2030 {
# Shutdown postmaster in here.
(gdb) c
Continuing.
Breakpoint 6, pqsecure_write (conn=0x804e208, ptr=0x804e208,
len=134537736) at fe-secure.c:406
406 pqsigfunc oldsighandler = pqsignal(SIGPIPE,
SIG_IGN);
(gdb) n
393 {
(gdb)
406 pqsigfunc oldsighandler = pqsignal(SIGPIPE,
SIG_IGN);
(gdb)
Breakpoint 4, pqsignal (signo=5, func=0x804e208) at pqsignal.c:35
35 act.sa_handler = func;
(gdb)
28 {
(gdb)
35 act.sa_handler = func;
(gdb)
36 sigemptyset(&act.sa_mask);
(gdb)
28 {
(gdb)
36 sigemptyset(&act.sa_mask);
(gdb)
28 {
(gdb)
36 sigemptyset(&act.sa_mask);
(gdb)
38 if (signo != SIGALRM)
(gdb)
42 act.sa_flags |= SA_NOCLDSTOP;
(gdb)
44 if (sigaction(signo, &act, &oact) < 0)
(gdb)
50 return oact.sa_handler;
(gdb)
52 }
(gdb)
pqsecure_write (conn=0x0, ptr=0x0, len=0) at fe-secure.c:480
480 n = send(conn->sock, ptr, len, 0);
(gdb)
Program received signal SIGPIPE, Broken pipe.
0xffffe410 in ?? ()
(gdb)
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Message-ID: <20060313155531.GA191@alamut>
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To: pgsql-interfaces@postgresql.org
Cc: yazicivo@ttnet.net.tr, tgl@sss.pgh.pa.us
Subject: Re: Receiving SIGPIPE for PQfinish(<broken-connection>)
In-Reply-To: <20060313155531.GA191@alamut>
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