SIGINFO interrupts connect() with libpthread
Robert Watson
rwatson at FreeBSD.org
Thu Oct 6 04:15:10 PDT 2005
I was writing test tools yesterday, and was a bit surprised to find that
hitting ctrl-T interrupts connect() for applications linked against
libpthread(). I wrote a simple test tool and found that this is not the
case for any of the other thread libraries (which seems correct to me).
Test tool attached:
peppercorn:~/tmp/connect> ./connect 192.168.100.203 80
Connecting to 192.168.100.203:80
load: 0.00 cmd: connect 54400 [runnable] 0.00u 0.00s 0% 972k
^C
peppercorn:~/tmp/connect> ./connect_libthr 192.168.100.203 80
Connecting to 192.168.100.203:80
load: 0.00 cmd: connect_libthr 54399 [connec] 0.00u 0.00s 0% 740k
^C
peppercorn:~/tmp/connect> ./connect_libpthread 192.168.100.203 80
Connecting to 192.168.100.203:80
load: 0.00 cmd: connect_libpthread 54401 [runnable] 0.00u 0.00s 0% 844k
connect_libpthread: connect(192.168.100.203 80): Interrupted system call
peppercorn:~/tmp/connect> ./connect_libc_r 192.168.100.203 80
Connecting to 192.168.100.203:80
load: 0.00 cmd: connect_libc_r 54402 [runnable] 0.00u 0.00s 0% 972k
^C
(note the importance of running the connect tool against an IP that won't
respond, or you will connect rather than blocking)
Robert N M Watson
-------------- next part --------------
all: connect connect_libthr connect_libpthread connect_libc_r
connect: connect.c
gcc -Wall -o connect connect.c
connect_libthr: connect.c
gcc -Wall -o connect_libthr connect.c -lthr
connect_libpthread: connect.c
gcc -Wall -o connect_libpthread connect.c -lpthread
connect_libc_r: connect.c
gcc -Wall -o connect_libc_r connect.c -lc_r
-------------- next part --------------
/*-
* Copyright (c) 2005 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main(int argc, char *argv[])
{
struct sockaddr_in sin;
int sock;
if (argc != 3)
errx(-1, "usage: connect [ip] [port]");
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr(argv[1]);
sin.sin_port = htons(atoi(argv[2]));
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0)
err(-1, "socket(PF_INET, SOCK_STREAM, 0)");
printf("Connecting to %s:%d\n", inet_ntoa(sin.sin_addr),
htons(sin.sin_port));
if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
err(-1, "connect(%s %d)", inet_ntoa(sin.sin_addr),
htons(sin.sin_port));
printf("Connected\n");
return (0);
}
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