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87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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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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* * 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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* * 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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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file piper_proc.hh
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*/
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#ifndef piper_proc_hh
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#define piper_proc_hh
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#include <string>
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#include <sys/types.h>
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#include "base/auto_fd.hh"
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/**
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* Creates a subprocess that reads data from a pipe and writes it to a file so
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* lnav can treat it like any other file and do preads.
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*
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* TODO: Add support for gzipped files.
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*/
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class piper_proc {
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public:
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class error : public std::exception {
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public:
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error(int err) : e_err(err) {}
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int e_err;
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};
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/**
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* Forks a subprocess that will read data from the given file descriptor
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* and write it to a temporary file.
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*
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* @param pipefd The file descriptor to read the file contents from.
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* @param timestamp True if an ISO 8601 timestamp should be prepended onto
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* the lines read from pipefd.
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* @param filefd The descriptor for the backing file.
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*/
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piper_proc(auto_fd pipefd, bool timestamp, auto_fd filefd);
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bool has_exited();
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/**
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* Terminates the child process.
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*/
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virtual ~piper_proc();
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/** @return The file descriptor for the temporary file. */
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auto_fd get_fd() { return this->pp_fd.dup(); }
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pid_t get_child_pid() const { return this->pp_child; }
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private:
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/** A file descriptor that refers to the temporary file. */
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auto_fd pp_fd;
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/** The child process' pid. */
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pid_t pp_child;
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};
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#endif
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