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9090848d06
posix/wordexp-test.c used libc-internal.h for PTR_ALIGN_DOWN; similar
to what was done with libc-diag.h, I have split the definitions of
cast_to_integer, ALIGN_UP, ALIGN_DOWN, PTR_ALIGN_UP, and PTR_ALIGN_DOWN
to a new header, libc-pointer-arith.h.
It then occurred to me that the remaining declarations in libc-internal.h
are mostly to do with early initialization, and probably most of the
files including it, even in the core code, don't need it anymore. Indeed,
only 19 files actually need what remains of libc-internal.h. 23 others
need libc-diag.h instead, and 12 need libc-pointer-arith.h instead.
No file needs more than one of them, and 16 don't need any of them!
So, with this patch, libc-internal.h stops including libc-diag.h as
well as losing the pointer arithmetic macros, and all including files
are adjusted.
* include/libc-pointer-arith.h: New file. Define
cast_to_integer, ALIGN_UP, ALIGN_DOWN, PTR_ALIGN_UP, and
PTR_ALIGN_DOWN here.
* include/libc-internal.h: Definitions of above macros
moved from here. Don't include libc-diag.h anymore either.
* posix/wordexp-test.c: Include stdint.h and libc-pointer-arith.h.
Don't include libc-internal.h.
* debug/pcprofile.c, elf/dl-tunables.c, elf/soinit.c, io/openat.c
* io/openat64.c, misc/ptrace.c, nptl/pthread_clock_gettime.c
* nptl/pthread_clock_settime.c, nptl/pthread_cond_common.c
* string/strcoll_l.c, sysdeps/nacl/brk.c
* sysdeps/unix/clock_settime.c
* sysdeps/unix/sysv/linux/i386/get_clockfreq.c
* sysdeps/unix/sysv/linux/ia64/get_clockfreq.c
* sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
* sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c:
Don't include libc-internal.h.
* elf/get-dynamic-info.h, iconv/loop.c
* iconvdata/iso-2022-cn-ext.c, locale/weight.h, locale/weightwc.h
* misc/reboot.c, nis/nis_table.c, nptl_db/thread_dbP.h
* nscd/connections.c, resolv/res_send.c, soft-fp/fmadf4.c
* soft-fp/fmasf4.c, soft-fp/fmatf4.c, stdio-common/vfscanf.c
* sysdeps/ieee754/dbl-64/e_lgamma_r.c
* sysdeps/ieee754/dbl-64/k_rem_pio2.c
* sysdeps/ieee754/flt-32/e_lgammaf_r.c
* sysdeps/ieee754/flt-32/k_rem_pio2f.c
* sysdeps/ieee754/ldbl-128/k_tanl.c
* sysdeps/ieee754/ldbl-128ibm/k_tanl.c
* sysdeps/ieee754/ldbl-96/e_lgammal_r.c
* sysdeps/ieee754/ldbl-96/k_tanl.c, sysdeps/nptl/futex-internal.h:
Include libc-diag.h instead of libc-internal.h.
* elf/dl-load.c, elf/dl-reloc.c, locale/programs/locarchive.c
* nptl/nptl-init.c, string/strcspn.c, string/strspn.c
* malloc/malloc.c, sysdeps/i386/nptl/tls.h
* sysdeps/nacl/dl-map-segments.h, sysdeps/x86_64/atomic-machine.h
* sysdeps/unix/sysv/linux/spawni.c
* sysdeps/x86_64/nptl/tls.h:
Include libc-pointer-arith.h instead of libc-internal.h.
* elf/get-dynamic-info.h, sysdeps/nacl/dl-map-segments.h
* sysdeps/x86_64/atomic-machine.h:
Add multiple include guard.
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/* brk -- Adjust the "break" at the end of initial data. NaCl version.
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdint.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <unistd.h>
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/* sbrk.c expects this. */
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void *__curbrk;
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static uintptr_t
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page_above (void *addr)
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{
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return ALIGN_UP ((uintptr_t) addr, EXEC_PAGESIZE);
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}
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/* Set the end of the process's data space to ADDR.
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Return 0 if successful, -1 if not. */
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int
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__brk (void *addr)
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{
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/* The NaCl sysbrk call is deprecated, so we do not use it here. Other
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libc code expects that __sbrk can be used at least a little bit, so
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rather than a plain stub we have a minimal __brk implementation here.
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It just uses mmap/munmap to grow or shrink the break area, punting as
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soon as mmap fails to use the same contiguous area. */
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if (__glibc_unlikely (__curbrk == NULL))
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{
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/* This is the first call. We must initialize the record
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of the current position. It starts out at the end of the
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main program's data segment. */
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/* XXX dynamic case??? */
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extern char _end[];
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__curbrk = _end;
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}
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if (__glibc_unlikely (addr == NULL))
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/* This is a call just to ensure that __curbrk is set up. */
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return 0;
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uintptr_t old_limit = page_above (__curbrk);
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uintptr_t new_limit = page_above (addr);
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if (old_limit > new_limit)
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{
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/* We're shrinking the old heap enough to release some pages. */
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if (__munmap ((void *) new_limit, old_limit - new_limit) != 0)
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return -1;
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}
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else if (old_limit < new_limit)
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{
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/* We're growing the old heap enough to need some more pages.
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See if they are available. */
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void *new_space = __mmap ((void *) old_limit, new_limit - old_limit,
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PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
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if (new_space != (void *) old_limit)
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{
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if (new_space != MAP_FAILED)
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{
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/* mmap chose some different place for the pages
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because the contiguous area was not available.
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Oh well. We can't use that. */
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__munmap (new_space, new_limit - old_limit);
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__set_errno (ENOMEM);
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}
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return -1;
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}
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}
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__curbrk = addr;
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return 0;
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}
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weak_alias (__brk, brk)
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