1  /* Set the sun_path member of struct sockaddr_un.
       2     Copyright (C) 2022-2023 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 <string.h>
      21  #include <sys/socket.h>
      22  #include <sys/un.h>
      23  
      24  int
      25  __sockaddr_un_set (struct sockaddr_un *addr, const char *pathname)
      26  {
      27    size_t name_length = strlen (pathname);
      28  
      29    /* The kernel supports names of exactly sizeof (addr->sun_path)
      30       bytes, without a null terminator, but userspace does not; see the
      31       SUN_LEN macro.  */
      32    if (name_length >= sizeof (addr->sun_path))
      33      {
      34        __set_errno (EINVAL);     /* Error code used by the kernel.  */
      35        return -1;
      36      }
      37  
      38    addr->sun_family = AF_UNIX;
      39    memcpy (addr->sun_path, pathname, name_length + 1);
      40    return 0;
      41  }