Skip site navigation (1)Skip section navigation (2) 
Date:      Fri, 21 Dec 2018 22:04:52 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 234258] SIGIO not delivered on socket when incoming connection arrives
Message-ID:  <bug-234258-227@https.bugs.freebsd.org/bugzilla/>
next in thread | raw e-mail | index | archive | help 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234258

            Bug ID: 234258
           Summary: SIGIO not delivered on socket when incoming connection
                    arrives
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: adelman@adelman.com

If a socket is set:

fcntl(sock, F_SETOWN, getpid()) and=20
fcntl(sock, F_SETFL,O_ASYNC)

when a connection arrives a SIGIO signal should be delivered to the appropr=
iate
process. Under FreeBSD 11.2 and prior releases, this works. Under FreeBSD
12.0-RELEASE, no signal is delivered.  This is the case with at least TCP a=
nd
UNIX domain sockets.

Duplicate by compiling and running the attached source code. "telnet 127.0.=
0.1
2666" to tickle the code with an incoming connection. Expected behavior is =
for
the signal handler to fire and print "signalfired(): SIGIO fired" to stderr.
Under FreeBSD 11.2 and prior (back to at least FreeBSD 2 the code that reli=
ed
on this worked), this works. Under FreeBSD 12.0-RELEASE the signal is not
delivered.

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>


static void signalfired()
{
        fprintf(stderr,"signalfired(): SIGIO fired\n");
}

int main(void)
{
        int sock;
        struct sockaddr_in sin =3D { AF_INET };  /* socket address */

        sin.sin_addr.s_addr =3D INADDR_ANY;
        sin.sin_port =3D htons(2666);

        sock =3D socket(AF_INET, SOCK_STREAM, 0);
        if (sock < 0) {
            perror("socket");
            exit(1);
        }

        if (bind(sock, (struct sockaddr *) &sin, sizeof(sin)) < 0){
            perror("bind");
            exit(1);
        }

        if (signal(SIGIO,(void *) signalfired)) {
            perror("trapping signal");
            exit(1);
        }
        if (fcntl(sock, F_SETOWN, getpid()) =3D=3D -1) {
            perror("fcntl(F_SETOWN)");
            exit(1);
        }
        if (fcntl(sock, F_SETFL, O_ASYNC) =3D=3D -1) {
            perror("fcntl(F_SETFL)");
            exit(1);
        }

        if (listen(sock, 10) < 0) {
            perror("listen");
            exit(1);
        }
        fprintf(stderr,"sleeping, test by \"telnet localhost %d\"\n",2666);
        sleep(10000);
}

--=20
You are receiving this mail because:
You are the assignee for the bug.=

Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-234258-227>