1  /* Linux recvmsg syscall wrapper.
       2     Copyright (C) 2016-2023 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 <sys/socket.h>
      20  #include <sysdep-cancel.h>
      21  #include <socketcall.h>
      22  
      23  static int
      24  __recvmsg_syscall (int fd, struct msghdr *msg, int flags)
      25  {
      26  #ifdef __ASSUME_RECVMSG_SYSCALL
      27    return SYSCALL_CANCEL (recvmsg, fd, msg, flags);
      28  #else
      29    return SOCKETCALL_CANCEL (recvmsg, fd, msg, flags);
      30  #endif
      31  }
      32  
      33  ssize_t
      34  __libc_recvmsg64 (int fd, struct msghdr *msg, int flags)
      35  {
      36    ssize_t r;
      37  #if __TIMESIZE != 64
      38    socklen_t orig_controllen = msg != NULL ? msg->msg_controllen : 0;
      39  #endif
      40  
      41    r = __recvmsg_syscall (fd, msg, flags);
      42  
      43  #if __TIMESIZE != 64
      44    if (r >= 0 && orig_controllen != 0)
      45      __convert_scm_timestamps (msg, orig_controllen);
      46  #endif
      47  
      48    return r;
      49  }
      50  #if __TIMESIZE != 64
      51  weak_alias (__libc_recvmsg64, __recvmsg64)
      52  
      53  ssize_t
      54  __libc_recvmsg (int fd, struct msghdr *msg, int flags)
      55  {
      56    return __recvmsg_syscall (fd, msg, flags);
      57  }
      58  #endif
      59  weak_alias (__libc_recvmsg, recvmsg)
      60  weak_alias (__libc_recvmsg, __recvmsg)