gdb/testsuite/gdb.reverse/readv-reverse.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2008-2022 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 }