poll.c File Reference

#include <poll.h>
#include <errno.h>
#include "server.h"
#include "logger.h"
#include "utils/signalHandling.h"

Include dependency graph for poll.c:

Go to the source code of this file.

Macros
#define	POLLFD(ptr)   ((struct pollfd *)(ptr))

Functions
int	serverPoll (Server this)

Detailed Description

Author

Georg Hopp

Copyright

Copyright © 2012 Georg Hopp

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file poll.c.

Macro Definition Documentation

#define POLLFD

(

ptr

)

((struct pollfd *)(ptr))

Definition at line 31 of file poll.c.

Function Documentation

int serverPoll

(

Server

this

)

put all closed fds to end of array in O(this->nfds)

Definition at line 34 of file poll.c.

References doShutdown, logger, LOGGER_CRIT, and loggerLog().

Referenced by serverRun().

                        {
    int events;

    /**
     * put all closed fds to end of array in O(this->nfds)
     */
    struct pollfd * fda = &(this->fds[2]);
    struct pollfd * fdb = &(this->fds[this->nfds-1]);

    while (fda <= fdb) {
        while (0 == fdb->fd && fda <= fdb) {
            fdb--;
            this->nfds--;
        }

        while (0 != fda->fd && fda <= fdb) fda++;

        if (fda < fdb) {
            memcpy(fda, fdb, sizeof(struct pollfd));
            fdb--;
            this->nfds--;
        }
    }

    /*
     * wait for handles to become ready
     */
    do {
        if (-1 == (events = poll(this->fds, this->nfds, -1))) {
            switch (errno) {
                default:
                case EBADF:
                case EINVAL:
                case ENOMEM:
                    doShutdown = 1;
                    // DROP THROUGH

                case EINTR:
                    loggerLog(this->logger, LOGGER_CRIT,
                            "poll systemcall failed: [%s] - service terminated",
                            strerror(errno));
            }
        }
    } while (! doShutdown && 0 >= events);

    return events;
}

Here is the call graph for this function:

Here is the caller graph for this function: