cf59e19e22
They're in glibc, though not in musl. Also add basic doc comments to the whole of <sys/uio.h>. Bug: http://b/203002492 Test: treehugger Change-Id: Ic607f7f349e5b7c9bf66c25b7bd68f827da530d6
103 lines
4 KiB
C++
103 lines
4 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#undef _FORTIFY_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <sys/resource.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/vfs.h>
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#include <unistd.h>
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#include "private/bionic_fdtrack.h"
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#if defined(__LP64__)
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#error This code is only needed on 32-bit systems!
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#endif
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// System calls we need.
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extern "C" int __llseek(int, unsigned long, unsigned long, off64_t*, int);
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// For lseek64 we need to use the llseek system call which splits the off64_t in two and
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// returns the off64_t result via a pointer because 32-bit kernels can't return 64-bit results.
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off64_t lseek64(int fd, off64_t off, int whence) {
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off64_t result;
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unsigned long off_hi = static_cast<unsigned long>(off >> 32);
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unsigned long off_lo = static_cast<unsigned long>(off);
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if (__llseek(fd, off_hi, off_lo, &result, whence) < 0) {
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return -1;
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}
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return result;
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}
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// There is no pread for 32-bit off_t, so we need to widen and call pread64.
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ssize_t pread(int fd, void* buf, size_t byte_count, off_t offset) {
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return pread64(fd, buf, byte_count, static_cast<off64_t>(offset));
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}
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// There is no pwrite for 32-bit off_t, so we need to widen and call pwrite64.
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ssize_t pwrite(int fd, const void* buf, size_t byte_count, off_t offset) {
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return pwrite64(fd, buf, byte_count, static_cast<off64_t>(offset));
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}
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// There is no fallocate for 32-bit off_t, so we need to widen and call fallocate64.
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int fallocate(int fd, int mode, off_t offset, off_t length) {
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return fallocate64(fd, mode, static_cast<off64_t>(offset), static_cast<off64_t>(length));
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}
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// There is no getrlimit64 system call, so we need to use prlimit64.
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int getrlimit64(int resource, rlimit64* limits64) {
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return prlimit64(0, resource, nullptr, limits64);
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}
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// There is no setrlimit64 system call, so we need to use prlimit64.
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int setrlimit64(int resource, const rlimit64* limits64) {
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return prlimit64(0, resource, limits64, nullptr);
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}
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// There is no prlimit system call, so we need to use prlimit64.
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int prlimit(pid_t pid, int resource, const rlimit* n32, rlimit* o32) {
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rlimit64 n64;
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if (n32 != nullptr) {
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n64.rlim_cur = (n32->rlim_cur == RLIM_INFINITY) ? RLIM64_INFINITY : n32->rlim_cur;
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n64.rlim_max = (n32->rlim_max == RLIM_INFINITY) ? RLIM64_INFINITY : n32->rlim_max;
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}
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rlimit64 o64;
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int result = prlimit64(pid, resource,
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(n32 != nullptr) ? &n64 : nullptr,
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(o32 != nullptr) ? &o64 : nullptr);
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if (result != -1 && o32 != nullptr) {
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o32->rlim_cur = (o64.rlim_cur == RLIM64_INFINITY) ? RLIM_INFINITY : o64.rlim_cur;
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o32->rlim_max = (o64.rlim_max == RLIM64_INFINITY) ? RLIM_INFINITY : o64.rlim_max;
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}
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return result;
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}
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