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/*******************************************************************************
*
* X testing environment - Google Test environment feat. dummy x server
*
* Copyright (C) 2011, 2012 Canonical Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
******************************************************************************/
#ifndef XORG_GTEST_PROCESS_H
#define XORG_GTEST_PROCESS_H
#include <stdarg.h>
#include <memory>
#include <string>
namespace xorg {
namespace testing {
/**
* @class Process test.h xorg/gtest/process.h
*
* Class that abstracts child process creation and termination.
*
* This class allows for forking, running and terminating child processes.
* In addition, manipulation of the child process' environment is supported.
* For example, starting an X server instance on display port 133 as a child
* process can be realized with the following code snippet:
* @code
* Process xorgServer;
* try {
* xorgServer.Start("Xorg", "Xorg", ":133");
* } catch (const std::runtime_error&e) {
* std::cerr << "Problem starting the X server: " << e.what() << std::endl;
* }
* ...
* if (!xorgServer.Terminate()) {
* std::cerr << "Problem terminating server ... killing now ..." << std::endl;
* if (!xorgServer.Kill())
* std::cerr << "Problem killing server" << std::endl;
* }
* @endcode
*/
class Process {
public:
/**
* Helper function to adjust the environment of the current process.
*
* @param [in] name Name of the environment variable.
* @param [in] value Value of the environment variable.
* @param [in] overwrite Whether to overwrite the value of existing env
* variables.
*
* @throws std::runtime_error if adjusting the environment does not succeed.
*/
static void SetEnv(const std::string& name, const std::string& value,
bool overwrite);
/**
* Helper function to query the environment of the current process.
*
* @param [in] name The name of the environment variable.
* @param [out] exists If not NULL, the variable will be set to true if the
* environment variable exists and to false otherwise.
* @returns The value of the environment variable, or an empty string.
*/
static std::string GetEnv(const std::string& name, bool* exists = NULL);
/**
* Creates a child-process that is in a terminated state.
*/
Process();
/**
* Starts a program as a child process.
*
* See 'man execvp' for further information on the variadic argument list.
*
* @param program The program to start.
* @param args Variadic list of arguments passed to the program.
*
* @throws std::runtime_error on failure.
*
* @post If successful: Child process forked and program started.
* @post If successful: Subsequent calls to Pid() return child process pid.
*/
void Start(const std::string& program, va_list args);
/**
* Starts a program as a child process.
*
* Takes a variadic list of arguments passed to the program.
* See 'man execvp' for further information on the variadic argument list.
*
* @param program The program to start.
*
* @throws std::runtime_error on failure.
*
* @post If successful: Child process forked and program started.
* @post If successful: Subsequent calls to Pid() return child process pid.
*/
void Start(const std::string& program, ...);
/**
* Terminates (SIGTERM) this child process.
*
* @throws std::runtime_error if child tries to terminate itself.
*
* @returns true if termination succeeded, false otherwise.
*
* @post If successful: Child process terminated.
* @post If successful: Subsequent calls to Pid() return -1.
*/
bool Terminate();
/**
* Kills (SIGKILL) this child process.
*
* @throws std::runtime_error if child tries to kill itself.
*
* @returns true if kill succeeded, false otherwise.
*
* @post If successful: Child process killed.
* @post If successful: Subsequent calls to Pid() return -1.
*/
bool Kill();
/**
* Accesses the pid of the child process.
*
* @returns The pid of the child process or -1.
*/
pid_t Pid() const;
private:
struct Private;
std::auto_ptr<Private> d_;
/* Disable copy constructor, assignment operator */
Process(const Process&);
Process& operator=(const Process&);
};
} // testing
} // xorg
#endif // XORG_GTEST_PROCESS_H
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