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// file : butl/process -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_PROCESS
#define BUTL_PROCESS
#ifndef _WIN32
# include <sys/types.h> // pid_t
#endif
#include <cassert>
#include <system_error>
namespace butl
{
struct process_error: std::system_error
{
process_error (int e, bool child)
: system_error (e, std::system_category ()), child_ (child) {}
bool
child () const {return child_;}
private:
bool child_;
};
struct process
{
// Start another process using the specified command line. Connect the
// newly created process' stdin to out_fd. Also if connect_* are true,
// connect the created process' stdout and stderr to in_*fd. Throw
// process_error if anything goes wrong.
//
// Note that some of the exceptions (e.g., if exec() failed) can be
// thrown in the child version of us.
//
process (char const* args[],
bool connect_stdin = false,
bool connect_stderr = false,
bool connect_stdout = false);
// Wait for the process to terminate. Return true if the process
// terminated normally and with the zero exit status. Throw
// process_error if anything goes wrong.
//
bool
wait ();
~process () {assert (id == 0);}
#ifndef _WIN32
typedef pid_t id_type;
#else
typedef void* id_type; // Win32 HANDLE.
#endif
id_type id;
int out_fd; // Write to this fd to send to the new process' stdin.
int in_efd; // Read from this fd to receive from the new process' stderr.
int in_ofd; // Read from this fd to receive from the new process' stdout.
};
}
#endif // BUTL_PROCESS
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