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683158e0 | 1 | /* brk system call for Linux/i386. |
d4697bc9 | 2 | Copyright (C) 1995-2014 Free Software Foundation, Inc. |
c6645251 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
c6645251 UD |
9 | |
10 | The GNU C Library 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 GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
c6645251 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
683158e0 RM |
18 | |
19 | #include <errno.h> | |
20 | #include <unistd.h> | |
21 | #include <sysdep.h> | |
22 | ||
2a4dcf76 RM |
23 | /* This must be initialized data because commons can't have aliases. */ |
24 | void *__curbrk = 0; | |
683158e0 | 25 | |
e685238c RM |
26 | /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt |
27 | to work around different old braindamage in the old Linux ELF dynamic | |
28 | linker. */ | |
29 | weak_alias (__curbrk, ___brk_addr) | |
30 | ||
683158e0 RM |
31 | int |
32 | __brk (void *addr) | |
33 | { | |
70d9946a | 34 | void *newbrk; |
df45b31e | 35 | |
6aca81bb | 36 | INTERNAL_SYSCALL_DECL (err); |
70d9946a | 37 | newbrk = (void *) INTERNAL_SYSCALL (brk, err, 1, addr); |
683158e0 RM |
38 | |
39 | __curbrk = newbrk; | |
40 | ||
41 | if (newbrk < addr) | |
42 | { | |
c4029823 | 43 | __set_errno (ENOMEM); |
683158e0 RM |
44 | return -1; |
45 | } | |
46 | ||
47 | return 0; | |
48 | } | |
49 | weak_alias (__brk, brk) |