mirror of
https://github.com/SerenityOS/serenity
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145 lines
4.6 KiB
C++
145 lines
4.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED 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 OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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static Vector<int> collect_fds(Vector<const char*> paths, bool append, bool* err)
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{
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int oflag;
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mode_t mode;
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if (append) {
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oflag = O_APPEND;
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mode = 0;
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} else {
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oflag = O_CREAT | O_WRONLY | O_TRUNC;
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mode = S_IROTH | S_IWOTH | S_IRGRP | S_IWGRP | S_IRUSR | S_IWUSR;
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}
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Vector<int> fds;
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for (const char* path : paths) {
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int fd = open(path, oflag, mode);
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if (fd < 0) {
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perror("failed to open file for writing");
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*err = true;
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} else {
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fds.append(fd);
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}
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}
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fds.append(STDOUT_FILENO);
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return fds;
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}
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static void copy_stdin(Vector<int>& fds, bool* err)
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{
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for (;;) {
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char buf[4096];
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ssize_t nread = read(STDIN_FILENO, buf, sizeof(buf));
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if (nread == 0)
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break;
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if (nread < 0) {
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perror("read() error");
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*err = true;
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// a failure to read from stdin should lead to an early exit
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return;
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}
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Vector<int> broken_fds;
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for (size_t i = 0; i < fds.size(); ++i) {
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auto fd = fds.at(i);
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int twrite = 0;
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while (twrite != nread) {
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ssize_t nwrite = write(fd, buf + twrite, nread - twrite);
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if (nwrite < 0) {
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if (errno == EINTR) {
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continue;
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} else {
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perror("write() failed");
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*err = true;
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broken_fds.append(fd);
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// write failures to a successfully opened fd shall
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// prevent further writes, but shall not block writes
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// to the other open fds
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break;
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}
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} else {
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twrite += nwrite;
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}
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}
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}
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// remove any fds which we can no longer write to for subsequent copies
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for (auto to_remove : broken_fds)
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fds.remove_first_matching([&](int fd) { return to_remove == fd; });
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}
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}
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static void close_fds(Vector<int>& fds)
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{
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for (int fd : fds) {
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int closed = close(fd);
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if (closed < 0) {
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perror("failed to close output file");
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}
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}
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}
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static void int_handler(int)
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{
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// pass
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}
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int main(int argc, char** argv)
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{
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bool append = false;
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bool ignore_interrupts = false;
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Vector<const char*> paths;
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Core::ArgsParser args_parser;
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args_parser.add_option(append, "Append, don't overwrite", "append", 'a');
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args_parser.add_option(ignore_interrupts, "Ignore SIGINT", "ignore-interrupts", 'i');
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args_parser.add_positional_argument(paths, "Files to copy stdin to", "file", Core::ArgsParser::Required::No);
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args_parser.parse(argc, argv);
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if (ignore_interrupts) {
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if (signal(SIGINT, int_handler) == SIG_ERR)
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perror("failed to install SIGINT handler");
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}
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bool err_open = false;
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bool err_write = false;
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auto fds = collect_fds(paths, append, &err_open);
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copy_stdin(fds, &err_write);
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close_fds(fds);
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return (err_open || err_write) ? 1 : 0;
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}
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