1 /* Copyright (C) 2013-2023 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 } 41