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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/* mmap - map files or devices into memory. Linux version.
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Copyright (C) 1999-2021 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sysdep.h>
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#include <mmap_internal.h>
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#ifdef __NR_mmap2
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/* To avoid silent truncation of offset when using mmap2, do not accept
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offset larger than 1 << (page_shift + off_t bits). For archictures with
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32 bits off_t and page size of 4096 it would be 1^44. */
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# define MMAP_OFF_HIGH_MASK \
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((-(MMAP2_PAGE_UNIT << 1) << (8 * sizeof (off_t) - 1)))
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#else
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/* Some ABIs might use __NR_mmap while having sizeof (off_t) smaller than
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sizeof (off64_t) (currently only MIPS64n32). For this case just set
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zero the higher bits so mmap with large offset does not fail. */
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# define MMAP_OFF_HIGH_MASK 0x0
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#endif
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#define MMAP_OFF_MASK (MMAP_OFF_HIGH_MASK | MMAP_OFF_LOW_MASK)
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/* An architecture may override this. */
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#ifndef MMAP_PREPARE
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# define MMAP_PREPARE(addr, len, prot, flags, fd, offset)
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#endif
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void *
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__mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
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{
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MMAP_CHECK_PAGE_UNIT ();
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if (offset & MMAP_OFF_MASK)
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return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
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MMAP_PREPARE (addr, len, prot, flags, fd, offset);
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#ifdef __NR_mmap2
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return (void *) MMAP_CALL (mmap2, addr, len, prot, flags, fd,
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(off_t) (offset / MMAP2_PAGE_UNIT));
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#else
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return (void *) MMAP_CALL (mmap, addr, len, prot, flags, fd, offset);
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#endif
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}
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weak_alias (__mmap64, mmap64)
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libc_hidden_def (__mmap64)
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#ifdef __OFF_T_MATCHES_OFF64_T
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weak_alias (__mmap64, mmap)
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weak_alias (__mmap64, __mmap)
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libc_hidden_def (__mmap)
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#endif
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