1  /* Linux poll implementation.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <sys/poll.h>
      21  
      22  #include <sysdep-cancel.h>
      23  #include <sys/syscall.h>
      24  
      25  int
      26  __poll (struct pollfd *fds, nfds_t nfds, int timeout)
      27  {
      28  #ifdef __NR_poll
      29    return SYSCALL_CANCEL (poll, fds, nfds, timeout);
      30  #else
      31    struct timespec timeout_ts;
      32    struct timespec *timeout_ts_p = NULL;
      33  
      34    if (timeout >= 0)
      35      {
      36        timeout_ts.tv_sec = timeout / 1000;
      37        timeout_ts.tv_nsec = (timeout % 1000) * 1000000;
      38        timeout_ts_p = &timeout_ts;
      39      }
      40  
      41    return SYSCALL_CANCEL (ppoll, fds, nfds, timeout_ts_p, NULL, 0);
      42  #endif
      43  }
      44  libc_hidden_def (__poll)
      45  weak_alias (__poll, poll)
      46  strong_alias (__poll, __libc_poll)