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      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2008-2024 Free Software Foundation, Inc.
      4 
      5    This program is free software; you can redistribute it and/or modify
      6    it under the terms of the GNU General Public License as published by
      7    the Free Software Foundation; either version 3 of the License, or
      8    (at your option) any later version.
      9 
     10    This program 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
     13    GNU General Public License for more details.
     14 
     15    You should have received a copy of the GNU General Public License
     16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     17 
     18 #define _GNU_SOURCE
     19 #include <unistd.h>
     20 #include <sys/uio.h>
     21 
     22 void
     23 marker1 (void)
     24 {
     25 }
     26 
     27 void
     28 marker2 (void)
     29 {
     30 }
     31 
     32 int fds[2] = { -1, -1 };
     33 char buf[5];
     34 const struct iovec v[4] = {
     35   { &buf[1], 1 },
     36   { &buf[0], 1 },
     37   { &buf[3], 1 },
     38   { &buf[2], 1 },
     39 };
     40 
     41 int
     42 main (void)
     43 {
     44   marker1 ();
     45   pipe (fds);
     46   write (fds[1], "UNIX", 4);
     47   readv (fds[0], v, 4);
     48   marker2 ();
     49   return 0;
     50 }
     51