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2a31c623 PA |
1 | /* This is part of GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | Copyright 2011-2015 Free Software Foundation, Inc. |
2a31c623 PA |
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 | ||
19 | #define _GNU_SOURCE 1 | |
20 | #include <dlfcn.h> | |
21 | #include <unistd.h> | |
22 | #include <fcntl.h> | |
23 | #include <stdlib.h> | |
24 | ||
25 | /* Wrap 'read', forcing it to return only one byte at a time, if | |
26 | reading from the terminal. */ | |
27 | ||
28 | ssize_t | |
29 | read (int fd, void *buf, size_t count) | |
30 | { | |
31 | static ssize_t (*read2) (int fd, void *buf, size_t count) = NULL; | |
32 | if (read2 == NULL) | |
33 | { | |
34 | unsetenv ("LD_PRELOAD"); | |
35 | read2 = dlsym (RTLD_NEXT, "read"); | |
36 | } | |
37 | if (count > 1 && isatty (fd) >= 1) | |
38 | count = 1; | |
39 | return read2 (fd, buf, count); | |
40 | } |