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brick-proc
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brick-proc
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// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 4 -*-
/*
* (c) 2016 Vladimír Štill <xstill@fi.muni.cz>
* (c) 2020 Adam Matoušek <xmatous3@fi.muni.cz>
* (c) 2021 Petr Ročkai <code@fixp.eu>
*/
/* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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. */
#pragma once
#include <brick-except>
#include <brick-fs>
#include <brick-string>
#include <string>
#include <vector>
#include <algorithm>
#include <iterator>
#include <sstream>
#include <iostream>
#include <future>
#include <memory>
#if defined( __unix__ ) || defined( __divine__ )
#include <termios.h>
#include <unistd.h>
#include <signal.h>
#include <spawn.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <poll.h>
#endif
extern char **environ;
namespace brq
{
enum spawn_opts_enum : unsigned
{
none = 0,
capture_stdout = 0x1,
capture_stderr = 0x2,
show_cmd = 0x100
};
struct spawn_opts
{
spawn_opts( spawn_opts_enum f ) : flags( f ) { }
spawn_opts( unsigned f ) : flags( spawn_opts_enum( f ) ) { }
explicit spawn_opts( std::string in ) : has_stdin( true ), in( in ) { }
bool has_flag( spawn_opts_enum f ) const { return (flags & f) == f; }
bool has_stdin = false;
std::string in;
spawn_opts_enum flags = none;
};
inline spawn_opts stdin_string( std::string in ) { return spawn_opts( in ); }
inline spawn_opts operator|( spawn_opts a, spawn_opts b )
{
a.flags = spawn_opts_enum( a.flags | b.flags );
ASSERT( !( a.has_stdin && b.has_stdin ) );
if ( b.has_stdin )
{
a.has_stdin = true;
a.in = std::move( b.in );
}
return a;
}
struct system_output
{
system_output( int exitcode, int signal, std::string out, std::string err ) :
_exitcode( exitcode ), _signal( signal ), _out( out ), _err( err )
{ }
bool ok() const { return _exitcode == 0 && _signal == 0; }
explicit operator bool() const { return ok(); }
int exitcode() const { return _exitcode; }
int signal() const { return _signal; }
const std::string &out() const { return _out; }
const std::string &err() const { return _err; }
private:
int _exitcode;
int _signal;
std::string _out;
std::string _err;
};
inline std::string to_string( const system_output &o )
{
string_builder ss;
ss << "exitcode = " << o.exitcode() << ", signal = " << o.signal() << "\n";
for ( auto x : { std::make_pair( "stdout", &o.out() ), std::make_pair( "stderr", &o.err() ) } )
{
if ( !x.second->empty() )
{
ss << x.first << ":" << "\n";
for ( auto line : splitter( *x.second, '\n' ) )
ss << " " << line << "\n";
ss << "\n";
}
}
return ss.buffer();
}
struct pipe
{
unique_fd _in, _out;
pipe()
{
int fds[ 2 ];
if ( ::pipe2( fds, O_CLOEXEC ) == -1 )
raise< system_error >() << "could not create a pipe";
_in.acquire( fds[ 0 ] );
_out.acquire( fds[ 1 ] );
}
void close()
{
_in.close();
_out.close();
}
void close_read() { _in.close(); }
void close_write() { _out.close(); }
std::string drain()
{
std::string str;
char data[ 1024 ];
long n;
do {
n = ::read( read().number(), data, sizeof( data ) );
if ( n > 0 )
str += std::string( data, n );
} while( n > 0 );
return str;
}
void push( std::string s )
{
const char *ptr = s.data();
const char *const end = ptr + s.size();
int r = 0;
while ( ptr < end && r >= 0 ) {
r = ::write( write().number(), ptr, end - ptr );
ptr += r;
}
}
const unique_fd &read() const { return _in; }
const unique_fd &write() const { return _out; }
void attach_stdout() { ::dup2( write().number(), STDOUT_FILENO ); }
void attach_stderr() { ::dup2( write().number(), STDERR_FILENO ); }
void attach_stdin() { ::dup2( read().number(), STDIN_FILENO ); }
};
#ifdef __unix__
inline system_output spawn_and_wait( spawn_opts opts, std::vector< std::string > args )
{
if ( opts.has_flag( show_cmd ) )
{
std::cerr << "+ ";
std::copy( args.begin(), args.end(), std::ostream_iterator< std::string >( std::cerr, " " ) );
std::cerr << std::endl;
}
std::vector< const char * > cargs;
std::transform( args.begin(), args.end(), std::back_inserter( cargs ),
[]( const std::string &s ) { return s.c_str(); } );
cargs.push_back( nullptr );
std::string out, err;
std::future< void > inf;
std::future< std::string > outf, errf;
std::unique_ptr< pipe > inp, outp, errp;
if ( opts.has_stdin )
inp = std::make_unique< pipe >();
if ( opts.has_flag( capture_stdout ) )
outp = std::make_unique< pipe >();
if ( opts.has_flag( capture_stderr ) )
errp = std::make_unique< pipe >();
pid_t pid = ::fork();
if ( pid == 0 )
{
if ( inp )
{
inp->attach_stdin();
inp->close();
}
if ( outp )
{
outp->attach_stdout();
outp->close();
}
if ( errp )
{
errp->attach_stderr();
errp->close();
}
::execvp( cargs[ 0 ], const_cast< char *const * >( cargs.data() ) );
std::cerr << "exec failed: " << cargs[ 0 ] << std::endl;
::_exit( 1 );
}
else if ( pid > 0 )
{
if ( inp ) {
inp->close_read();
inf = std::async( std::launch::async, [&] { inp->push( opts.in ); inp->close(); } );
}
if ( outp ) {
outp->close_write();
outf = std::async( std::launch::async, [&] { return outp->drain(); } );
}
if ( errp ) {
errp->close_write();
errf = std::async( std::launch::async, [&] { return errp->drain(); } );
}
int status;
int r = ::waitpid( pid, &status, 0 );
if ( inf.valid() )
inf.get();
out = outf.valid() ? outf.get() : "";
err = errf.valid() ? errf.get() : "";
if ( r < 0 )
raise< system_error >() << "waitpid error";
return system_output( WIFEXITED( status ) ? WEXITSTATUS( status ) : 0,
WIFSIGNALED( status ) ? WTERMSIG( status ) : 0,
out, err );
}
else
{
raise< system_error >() << "fork failed";
abort();
}
}
inline system_output spawn_and_wait( std::vector< std::string > args )
{
return spawn_and_wait( none, args );
}
template< typename... Args >
system_output spawn_and_wait( spawn_opts opts, Args &&...args )
{
return spawn_and_wait( opts, std::vector< std::string >{ std::forward< Args >( args )... } );
}
template< typename... Args >
system_output spawn_and_wait( spawn_opts_enum opts, Args &&...args )
{
return spawn_and_wait( spawn_opts( opts ), std::forward< Args >( args )... );
}
template< typename... Args >
system_output spawn_and_wait( unsigned opts, Args &&...args )
{
// note: result of | on spawn_opts_enum in unsigned
return spawn_and_wait( spawn_opts( spawn_opts_enum( opts ) ), std::forward< Args >( args )... );
}
template< typename... Args >
system_output spawn_and_wait( Args &&...args )
{
return spawn_and_wait( none, std::forward< Args >( args )... );
}
inline system_output shell_spawn_and_wait( spawn_opts opts, std::string shellcmd )
{
return spawn_and_wait( opts, "/bin/sh", "-c", shellcmd );
}
inline system_output shell_spawn_and_wait( std::string shellcmd )
{
return shell_spawn_and_wait( none, shellcmd );
}
#endif
#ifdef __unix__
struct spawn
{
struct
{
pid_t pid = -1;
pipe from_child, to_child;
int status = 0;
} _d;
const unique_fd &read_fd() const { return _d.from_child.read(); }
const unique_fd &write_fd() const { return _d.to_child.write(); }
unique_fd take_read_fd() { return std::move( _d.from_child._in ); }
unique_fd take_write_fd() { return std::move( _d.to_child._out ); }
spawn( spawn &&o ) : _d( std::move( o._d ) )
{
o._d.pid = -1;
}
spawn &operator=( spawn &&o )
{
close();
_d = std::move( o._d );
o._d.pid = -1;
return *this;
}
template< typename exec_t >
spawn( exec_t exec, std::enable_if_t< std::is_invocable_v< exec_t >, int > = 0 )
{
_d.pid = ::fork();
if ( _d.pid == 0 ) /* child */
{
_d.to_child.attach_stdin();
_d.from_child.attach_stdout();
_d.to_child.close();
_d.from_child.close();
exec();
std::cerr << "spawn: exec didn't, in fact, exec" << std::endl;
abort();
}
else if ( _d.pid > 0 ) /* parent */
{
_d.to_child.close_read();
_d.from_child.close_write();
}
else
throw brq::system_error( "spawn: fork" );
}
static auto execvp( std::vector< std::string > args )
{
return [=]
{
std::vector< const char * > cargs;
std::transform( args.begin(), args.end(), std::back_inserter( cargs ),
[]( const std::string &s ) { return s.c_str(); } );
cargs.push_back( nullptr );
::execvp( cargs[ 0 ], const_cast< char * const * >( cargs.data() ) );
};
}
spawn( std::vector< std::string > args )
: spawn( execvp( args ) )
{}
template< typename... args_t,
typename = decltype( std::vector{ std::string( std::declval< args_t >() )... } ) >
spawn( args_t &&... args )
: spawn( std::vector{ std::string( args )... } )
{}
spawn() = default;
int close()
{
if ( _d.pid < 0 )
return _d.status;
DEBUG( "spawn::close()", _d.pid );
pid_t pid = _d.pid;
_d.pid = -1;
int wst;
if ( waitpid( pid, &wst, 0 ) < 0 )
throw brq::system_error( "spawn: wait" );
if ( WIFEXITED( wst ) )
_d.status = WEXITSTATUS( wst );
if ( WIFSIGNALED( wst ) )
_d.status = -WTERMSIG( wst );
return _d.status;
}
~spawn() { close(); }
};
#endif
/* • ‹write› is called when writing is possible; gets the file descriptor as
* its argument and returns whether to attempt for further writes; see the
* ‹feed› function for a pre-made implementation.
* • ‹read› is called when reading is possible; gets the file descriptor as
* its argument and returns whether to continue. See ‹pipe_read_lines›
* for a handy wrapper. */
enum class io_result { done, ready, blocked };
struct communicate_base
{
virtual void forever() = 0;
virtual void poll( int = 0 ) = 0;
virtual void poll_in( int = 0 ) = 0;
virtual void poll_out( int = 0 ) = 0;
virtual string_builder read( int bytes ) = 0;
virtual ~communicate_base() = default;
};
template < typename write_t, typename read_t, typename eof_t = void(*)() >
struct communicate : communicate_base
{
unique_fd fd_out, fd_in;
const write_t &do_write;
const read_t &do_read;
eof_t eof;
std::array< pollfd, 2 > fdset;
int res = 0;
communicate( unique_fd out, unique_fd in,
const write_t &w, const read_t &r, eof_t eof = []{} )
: fd_out( std::move( out ) ), fd_in( std::move( in ) ),
do_write( w ), do_read( r ), eof( eof )
{
::fcntl( fd_out.number(), F_SETFL, O_NONBLOCK );
::fcntl( fd_in.number(), F_SETFL, O_NONBLOCK );
fdset[ 0 ] = { fd_out.number(), POLLOUT, 0 };
fdset[ 1 ] = { fd_in.number(), POLLIN, 0 };
}
void forever() override
{
while ( fdset[ 0 ].fd >= 0 || fdset[ 1 ].fd >= 0 )
poll();
}
void poll( int timeout = -1 ) override
{
_poll( timeout );
_poll_out();
_poll_in();
}
void _poll_partial( int timeout, int which )
{
auto backup = fdset[ which ].events;
brq::finally _cleanup( [&]{ fdset[ which ].events = backup; } );
fdset[ which ].events = 0; /* ignore */
_poll( timeout );
if ( which == 0 )
_poll_out();
else
_poll_in();
}
void poll_in( int timeout = 0 ) override { _poll_partial( timeout, 1 ); }
void poll_out( int timeout = 0 ) override { _poll_partial( timeout, 0 ); }
string_builder read( int to_read ) override
{
string_builder out;
char buffer[ 512 ];
while ( to_read )
{
int bytes = ::read( fd_in.number(), buffer, std::min( to_read, 512 ) );
if ( bytes > 0 )
{
out << std::string_view( buffer, bytes );
to_read -= bytes;
}
else if ( bytes < 0 )
{
if ( errno == EAGAIN || errno == EINTR )
continue;
throw brq::system_error( "fd::read" );
}
else
break;
}
return out;
}
void _poll( int timeout )
{
fdset[ 0 ].revents = fdset[ 1 ].revents = 0;
if ( res == 0 )
res = ::poll( fdset.begin(), fdset.size(), timeout );
if ( res == -1 )
{
if ( errno == EINTR )
return poll( timeout );
throw brq::system_error( "communicate: poll" );
}
if ( res == 0 && timeout )
throw std::runtime_error( "communicate: poll timed out" );
res = 0;
}
void _poll_out()
{
if ( fdset[ 0 ].revents & ( POLLERR | POLLOUT | POLLHUP ) ||
fdset[ 0 ].events == 0 /* was previously blocked */ )
{
auto result = do_write( fd_out );
if ( result == io_result::done || fdset[ 0 ].revents & ( POLLHUP | POLLERR ) )
{
fd_out.close();
fdset[ 0 ].fd = -1;
}
else
fdset[ 0 ].events = result == io_result::ready ? POLLOUT : 0;
}
}
void _poll_in()
{
if ( fdset[ 1 ].revents & ( POLLERR | POLLIN | POLLHUP ) )
{
if ( !do_read( fd_in ) || fdset[ 1 ].revents & ( POLLERR | POLLHUP ) )
{
fd_in.close();
fdset[ 1 ].fd = -1;
res = 1; /* skip next poll */
eof();
}
else
fdset[ 0 ].events = POLLOUT;
}
}
};
/* Pipethrough for filtering data through a subprocess.
*
* 'Exec' shall execve(2) eventually. See ‹communicate› above regarding ‹read›
* and ‹write›. File descriptors are closed automatically, don't do it in the
* callbacks.
*
* Returns the return code of the subprocess or a negative number of the signal
* that terminated it. */
#ifdef __unix__
template < typename Write, typename Read, typename... Exec >
int pipethrough( Write do_write, Read do_read, Exec... exec )
{
spawn child( exec... );
communicate comm( child.take_write_fd(), child.take_read_fd(), do_write, do_read );
comm.forever();
return child.close();
}
#endif
template< typename Yield, unsigned BUFFER_SIZE = 512 >
struct pipe_read_lines
{
mutable char _buffer[ BUFFER_SIZE ];
mutable std::string _line_buffer;
Yield yield;
pipe_read_lines( Yield y ) : yield( y ) {}
bool operator()( const brq::unique_fd &fd ) const
{
int bytes = read( fd.number(), _buffer, BUFFER_SIZE - 1 );
bool result = bytes > 0;
if ( bytes == -1 )
{
if ( errno == EAGAIN || errno == EWOULDBLOCK )
return true;
throw brq::system_error( "pipe_read_lines: read" );
}
_buffer[ bytes ] = '\0';
_line_buffer.append( _buffer );
for ( size_t lf; ( lf = _line_buffer.find( '\n' ) ) != std::string::npos; )
{
auto line = _line_buffer.substr( 0, lf ); // don't include the newline
if constexpr ( std::is_same_v< decltype( yield( "" ) ), void > )
yield( line );
else
if ( !yield( line ) )
{
result = false;
break;
}
_line_buffer.erase( 0, lf + 1 );
}
if ( !result && !_line_buffer.empty() )
yield( _line_buffer );
return result;
}
};
struct pipe_feed
{
mutable string_builder _buffer_1, _buffer_2;
mutable bool _closed = true;
mutable std::string_view _todo;
mutable std::function< void() > _callback;
pipe_feed( std::string_view data ) : _todo( data ) {}
pipe_feed( std::function< void() > cb = {} ) : _closed( false ), _callback( cb ) {}
void set_callback( std::function< void() > cb ) { _callback = cb; }
void close() { _closed = true; }
template< typename arg_t >
auto operator<<( const arg_t &arg ) -> decltype( _buffer_2 << arg, *this )
{
return _buffer_2 << arg, *this;
}
bool shift_buffers() const
{
if ( _todo.empty() )
{
_buffer_1 = std::move( _buffer_2 );
_buffer_2.clear();
_todo = _buffer_1.data();
if ( _callback )
_callback();
}
return !_todo.empty();
}
io_result operator()( const brq::unique_fd &fd ) const
{
if ( !shift_buffers() )
return _closed ? io_result::done : io_result::blocked;
int bytes = write( fd.number(), _todo.data(), _todo.length() );
if ( _todo.length() && bytes == 0 )
return io_result::done;
if ( bytes == -1 )
{
if ( errno == EPIPE )
return io_result::done;
if ( errno == EAGAIN || errno == EWOULDBLOCK )
return io_result::ready;
raise< system_error >() << "pipe_feed: error writing " << _todo.length() << " bytes";
}
_todo.remove_prefix( bytes );
if ( !shift_buffers() )
return _closed ? io_result::done : io_result::blocked;
else
return io_result::ready;
}
};
struct xterm
{
struct
{
int pid = 0;
int masterfd, slavefd;
std::unique_ptr< std::iostream > stream;
std::unique_ptr< brq::posix_buf > buf;
} _d;
struct sbuf : brq::posix_buf
{
using brq::posix_buf::posix_buf;
int sync()
{
char tmp[ _buf_size * 2 ];
int i = 0;
for ( auto p = pbase(); p < pptr(); ++p )
{
if ( *p == '\n' )
tmp[ i++ ] = '\r';
tmp[ i++ ] = *p;
}
do_sync( tmp, i );
return 0;
}
};
void open()
{
_d.masterfd = posix_openpt( O_RDWR );
if ( grantpt( _d.masterfd ) )
throw std::system_error( errno, std::system_category(),
"Could not grantpt()." );
if ( unlockpt( _d.masterfd ) )
throw std::system_error( errno, std::system_category(),
"Could not unlockpt()." );
const char *slavepts = ptsname( _d.masterfd );
if ( !slavepts )
throw std::system_error( errno, std::system_category(),
"Could not ptsname()." );
_d.slavefd = ::open( slavepts, O_RDWR );
if ( _d.slavefd < 0 )
throw std::system_error( errno, std::system_category(),
"Could not open slave PTS." );
std::string slave = std::string( "-S" ) +
slavepts + "/" + std::to_string( _d.slavefd );
const char *argv[] = { "xterm", slave.c_str(), nullptr };
posix_spawnattr_t sp;
posix_spawnattr_init( &sp );
posix_spawnattr_setflags( &sp, POSIX_SPAWN_SETPGROUP );
posix_spawnattr_setpgroup( &sp, 0 );
posix_spawnp( &_d.pid, "xterm", nullptr, &sp,
const_cast< char ** >( argv ), environ );
char buf[8];
::read( _d.masterfd, buf, 8 ); /* handshake */
struct termios tio;
tcgetattr( _d.slavefd, &tio );
tio.c_lflag = 0; /* no ECHO means we don't read things back */
tio.c_iflag = 0;
tio.c_oflag = 0;
tcsetattr( _d.slavefd, TCSANOW, &tio );
_d.buf.reset( new sbuf( _d.masterfd ) );
_d.stream.reset( new std::iostream( _d.buf.get() ) );
}
int fd() { return _d.masterfd; }
std::iostream &stream() { return *_d.stream; }
xterm() = default;
xterm( const xterm & ) = delete;
xterm( xterm &&o )
{
_d = std::move( o._d );
o._d.pid = 0;
}
~xterm()
{
if ( _d.pid )
{
kill( _d.pid, SIGTERM );
close( _d.masterfd );
close( _d.slavefd );
waitpid( _d.pid, nullptr, 0 );
}
_d.pid = 0;
}
};
}