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// file : libbutl/process-run.txx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <cassert>
#include <utility> // forward(), index_sequence
namespace butl
{
template <typename V>
process_env::
process_env (const process_path& p, const V& v)
: process_env (p)
{
if (!v.empty ())
{
std::string storage;
process_args_as (vars_, v, storage);
assert (storage.empty ()); // We don't expect the storage to be used.
vars_.push_back (nullptr);
vars = vars_.data ();
}
}
inline int process_stdin (int v) {assert (v >= 0); return v;}
inline int process_stdout (int v) {assert (v >= 0); return v;}
inline int process_stderr (int v) {assert (v >= 0); return v;}
inline int
process_stdin (const auto_fd& v) {assert (v.get () >= 0); return v.get ();}
inline int
process_stdout (const auto_fd& v) {assert (v.get () >= 0); return v.get ();}
inline int
process_stderr (const auto_fd& v) {assert (v.get () >= 0); return v.get ();}
LIBBUTL_SYMEXPORT process
process_start (const dir_path* cwd,
const process_path& pp,
const char* cmd[],
const char* const* envvars,
int in,
int out,
int err);
template <typename V, typename T>
inline const char*
process_args_as_wrapper (V& v, const T& x, std::string& storage)
{
process_args_as (v, x, storage);
return nullptr;
}
template <typename C,
typename I,
typename O,
typename E,
typename... A,
typename std::size_t... index>
process
process_start (std::index_sequence<index...>,
const C& cmdc,
I&& in,
O&& out,
E&& err,
const process_env& env,
A&&... args)
{
// Map stdin/stdout/stderr arguments to their integer values, as expected
// by the process constructor.
//
int in_i (process_stdin (std::forward<I> (in)));
int out_i (process_stdout (std::forward<O> (out)));
int err_i (process_stderr (std::forward<E> (err)));
// Construct the command line array.
//
const std::size_t args_size (sizeof... (args));
small_vector<const char*, args_size + 2> cmd;
assert (env.path != nullptr);
cmd.push_back (env.path->recall_string ());
std::string storage[args_size != 0 ? args_size : 1];
const char* dummy[] = {
nullptr, process_args_as_wrapper (cmd, args, storage[index])... };
cmd.push_back (dummy[0]); // NULL (and get rid of unused warning).
cmdc (cmd.data (), cmd.size ());
// @@ Do we need to make sure certain fd's are closed before calling
// wait()? Is this only the case with pipes? Needs thinking.
return process_start (env.cwd,
*env.path, cmd.data (),
env.vars,
in_i, out_i, err_i);
}
template <typename C,
typename I,
typename O,
typename E,
typename... A>
inline process
process_start (const C& cmdc,
I&& in,
O&& out,
E&& err,
const process_env& env,
A&&... args)
{
return process_start (std::index_sequence_for<A...> (),
cmdc,
std::forward<I> (in),
std::forward<O> (out),
std::forward<E> (err),
env,
std::forward<A> (args)...);
}
template <typename I,
typename O,
typename E,
typename... A>
inline process
process_start (I&& in,
O&& out,
E&& err,
const process_env& env,
A&&... args)
{
return process_start ([] (const char* [], std::size_t) {},
std::forward<I> (in),
std::forward<O> (out),
std::forward<E> (err),
env,
std::forward<A> (args)...);
}
template <typename C,
typename I,
typename O,
typename E,
typename... A>
inline process_exit
process_run (const C& cmdc,
I&& in,
O&& out,
E&& err,
const process_env& env,
A&&... args)
{
process pr (
process_start (cmdc,
std::forward<I> (in),
std::forward<O> (out),
std::forward<E> (err),
env,
std::forward<A> (args)...));
pr.wait ();
return *pr.exit;
}
template <typename I,
typename O,
typename E,
typename... A>
inline process_exit
process_run (I&& in,
O&& out,
E&& err,
const process_env& env,
A&&... args)
{
return process_run ([] (const char* [], std::size_t) {},
std::forward<I> (in),
std::forward<O> (out),
std::forward<E> (err),
env,
std::forward<A> (args)...);
}
}
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