gdb/contrib/expect-read1.c

   1 /* Copyright (C) 2013-2022 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   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 /* RTLD_NEXT requires _GNU_SOURCE.  */
  19 #define _GNU_SOURCE 1
  20 #include <dlfcn.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <stdlib.h>
  24
  25 ssize_t
  26 read (int fd, void *buf, size_t count)
  27 {
  28   static ssize_t (*read2) (int fd, void *buf, size_t count) = NULL;
  29
  30   if (read2 == NULL)
  31     {
  32       unsetenv ("LD_PRELOAD");
  33       read2 = dlsym (RTLD_NEXT, "read");
  34     }
  35
  36   if (count > 1 && isatty (fd) == 1)
  37     count = 1;
  38
  39   return read2 (fd, buf, count);
  40 }