socket/sockaddr_un_set.c

   1 /* Set the sun_path member of struct sockaddr_un.
   2    Copyright (C) 2022 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 }