gdb/2032: GDB introduces odd behavior with accept() function

[devin at freeshell dot org]

>Number:         2032
>Category:       gdb
>Synopsis:       GDB introduces odd behavior with accept() function
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 11 23:38:01 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     devin@freeshell.org
>Release:        gdb-6.3
>Organization:
>Environment:
libc-2.3.5 linux-2.6.11 gcc-4.0.2
>Description:
When debugging this test program, interupt it during the accept and type "signal SIGHUP".  fd becomes -512.  Without using gdb, it becomes -1.

#define _XOPEN_SOURCE 600
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <signal.h>

void hangup(int sig) { fprintf(stderr, "SIG=%i\n", sig); }

int main(void)
    {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in addr = {0};
    int len = sizeof(addr);

    addr.sin_family = AF_INET;
    addr.sin_port = htons(9999);
    bind(sockfd, &addr, len);
    listen(sockfd,5);

    signal(SIGHUP, hangup);

    int fd;
    while(fd = accept(sockfd, &addr, &len))
        fprintf(stderr, "FD=%i\n", fd);

    }
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: