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