1 /* This is part of GDB, the GNU debugger.
3 Copyright 2011-2019 Free Software Foundation, Inc.
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.
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.
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/>.
25 /* Wrap 'read', forcing it to return only one byte at a time, if
26 reading from the terminal. */
29 read (int fd, void *buf, size_t count)
31 static ssize_t (*read2) (int fd, void *buf, size_t count) = NULL;
34 /* Use setenv (v, "", 1) rather than unsetenv (v) to work around
35 https://core.tcl-lang.org/tcl/tktview?name=67fd4f973a "incorrect
36 results of 'info exists' when unset env var in one interp and check
37 for existence from another interp". */
38 setenv ("LD_PRELOAD", "", 1);
39 read2 = dlsym (RTLD_NEXT, "read");
41 if (count > 1 && isatty (fd) >= 1)
43 return read2 (fd, buf, count);