diff options
Diffstat (limited to 'libc/sysdeps/linux/common')
| -rw-r--r-- | libc/sysdeps/linux/common/Makefile | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/common/sbrk.c | 47 |
2 files changed, 48 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/Makefile b/libc/sysdeps/linux/common/Makefile index e7d92573b..bd097452a 100644 --- a/libc/sysdeps/linux/common/Makefile +++ b/libc/sysdeps/linux/common/Makefile @@ -27,7 +27,7 @@ include $(TOPDIR)Rules.mak CSRC= waitpid.c kernel_version.c statfix.c getdnnm.c gethstnm.c \ mkfifo.c setegid.c wait.c errno.c getpagesize.c seteuid.c \ wait3.c setpgrp.c getdtablesize.c create_module.c ptrace.c \ - cmsg_nxthdr.c open64.c statfix64.c statfs64.c + cmsg_nxthdr.c open64.c statfix64.c statfs64.c sbrk.c COBJS=$(patsubst %.c,%.o, $(CSRC)) MSRC=syscalls.c diff --git a/libc/sysdeps/linux/common/sbrk.c b/libc/sysdeps/linux/common/sbrk.c new file mode 100644 index 000000000..028370e99 --- /dev/null +++ b/libc/sysdeps/linux/common/sbrk.c @@ -0,0 +1,47 @@ +/* Copyright (C) 1991, 1995, 1996, 1997, 2000 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <unistd.h> +#include <errno.h> + +/* Defined in brk.c. */ +extern void *__curbrk; +extern int brk (void *addr); + + +/* Extend the process's data space by INCREMENT. + If INCREMENT is negative, shrink data space by - INCREMENT. + Return start of new space allocated, or -1 for errors. */ +void * sbrk (intptr_t increment) +{ + void *oldbrk; + + if (__curbrk == NULL) + if (brk (0) < 0) /* Initialize the break. */ + return (void *) -1; + + if (increment == 0) + return __curbrk; + + oldbrk = __curbrk; + if (brk (oldbrk + increment) < 0) + return (void *) -1; + + return oldbrk; +} + |