source: vendor/current/lib/util/select.c

/*
   Unix SMB/Netbios implementation.
   Version 3.0
   Samba select/poll implementation
   Copyright (C) Andrew Tridgell 1992-1998

   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/>.
*/

#include "includes.h"
#include "system/filesys.h"
#include "system/select.h"
#include "lib/util/select.h"

int sys_poll_intr(struct pollfd *fds, int num_fds, int timeout)
{
        int orig_timeout = timeout;
        struct timespec start;
        int ret;

        clock_gettime_mono(&start);

        while (true) {
                struct timespec now;
                int64_t elapsed;

                ret = poll(fds, num_fds, timeout);
                if (ret != -1) {
                        break;
                }
                if (errno != EINTR) {
                        break;
                }
                /* Infinite timeout, no need to adjust. */
                if (timeout < 0) {
                        continue;
                }
                clock_gettime_mono(&now);
                elapsed = nsec_time_diff(&now, &start) / 1000000;
                timeout = orig_timeout - elapsed;
                /* Unlikely, but might happen eg. when getting traced.
                 * Make sure we're not hanging in this case.
                 */
                if (timeout < 0) {
                        timeout = 0;
                }
        };
        return ret;
}