version bump

based on testing, the pty EOF is never flagged. Instead, exit the thread when the child pid dies.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "a2-terminfo"]
+	path = a2-terminfo
+	url = https://github.com/ksherlock/a2-terminfo

ChildMonitor.h

@@ -0,0 +1,20 @@
+//
+//  ChildMonitor.h
+//  TwoTerm
+//
+//  Created by Kelvin Sherlock on 1/31/2018.
+//
+
+#import <Foundation/Foundation.h>
+
+@class TermWindowController;
+@interface ChildMonitor : NSObject {
+
+}
+
++(id)monitor;
+
+-(void)removeController: (TermWindowController *)controller;
+-(void)addController: (TermWindowController *)controller pid: (pid_t)pid fd: (int)fd;
+
+@end

ChildMonitor.mm

@@ -0,0 +1,239 @@
+//
+//  ChildMonitor.m
+//  TwoTerm
+//
+//  Created by Kelvin Sherlock on 1/31/2018.
+//
+
+#import "ChildMonitor.h"
+#import "TermWindowController.h"
+
+#include "Lock.h"
+
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+
+#include <vector>
+#include <algorithm>
+
+
+namespace  {
+
+    struct entry {
+        pid_t pid;
+        int fd;
+        TermWindowController *controller;
+    };
+
+    
+    typedef std::vector<entry> entry_vector;
+    
+    entry_vector::iterator find_controller(entry_vector &table, TermWindowController *controller) {
+        return std::find_if(table.begin(), table.end(), [=](const entry &e){
+            return e.controller == controller;
+        });
+    }
+
+    entry_vector::iterator find_pid(entry_vector &table, pid_t pid) {
+        return std::find_if(table.begin(), table.end(), [=](const entry &e){
+            return e.pid == pid;
+        });
+    }
+
+    entry_vector::iterator find_fd(entry_vector &table, int fd) {
+        return std::find_if(table.begin(), table.end(), [=](const entry &e){
+            return e.fd == fd;
+        });
+    }
+    
+    /* return NO on EOF */
+    BOOL read(int fd, TermWindowController *controller) {
+        size_t total = 0;
+        for (;;) {
+            uint8_t buffer[2048];
+            ssize_t ok = ::read(fd, buffer, sizeof(buffer));
+            if (ok == 0) return total > 0;
+            if (ok < 1) {
+                if (errno == EINTR) continue;
+                if (errno == EAGAIN) return YES;
+                return YES;
+            }
+            [controller processData: buffer size: ok];
+            if (ok < sizeof(buffer)) return YES;
+            total += ok;
+        }
+    }
+    
+}
+
+
+@interface ChildMonitor() {
+    std::vector<entry> _table;
+    int _kq;
+    Lock _lock;
+}
+@end
+@implementation ChildMonitor
+
++(id)monitor {
+    static ChildMonitor *me = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        me = [ChildMonitor new];
+        [NSThread detachNewThreadSelector: @selector(run) toTarget: me withObject: nil];
+    });
+    return me;
+}
+
+-(id)init {
+    if ((self = [super init])) {
+        
+        _kq = kqueue();
+        
+    }
+    return self;
+}
+
+-(void)dealloc {
+    _lock.lock();
+    close(_kq);
+    for (const auto &e : _table) {
+        if (e.fd >= 0) close(e.fd);
+        if (e.pid > 0) kill(e.pid, SIGHUP);
+        if (e.controller) [e.controller release];
+    }
+    _lock.unlock();
+    [super dealloc];
+}
+
+-(void)removeController: (TermWindowController *)controller {
+
+    if (!controller) return;
+    
+    Locker l(_lock);
+
+    auto iter = find_controller(_table, controller);
+    if (iter != _table.end()) {
+        [iter->controller release];
+        iter->controller = nil;
+        if (iter->pid > 0) kill(iter->pid, SIGHUP);
+    }
+}
+
+-(void)addController: (TermWindowController *)controller pid: (pid_t)pid fd: (int)fd {
+
+    NSLog(@"Adding pid: %d fd: %d", pid, fd);
+
+    int flags;
+    // non-blocking io.
+    if (fcntl(fd, F_GETFL, &flags) < 0) flags = 0;
+    fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+    
+    Locker l(_lock);
+    
+    _table.emplace_back(entry{pid, fd, [controller retain]});
+
+    struct kevent events[2] = {};
+    
+    EV_SET(&events[0], fd, EVFILT_READ, EV_ADD | EV_RECEIPT, 0, 0, NULL);
+    EV_SET(&events[1], pid, EVFILT_PROC, EV_ADD | EV_ONESHOT | EV_RECEIPT, NOTE_EXIT | NOTE_EXITSTATUS, 0, NULL);
+    
+    kevent(_kq, events, 2, NULL, 0, NULL);
+}
+
+-(void) run {
+    struct kevent events[16] = {};
+
+    for(;;) {
+
+        @autoreleasepool {
+
+            int n = kevent(_kq, NULL, 0, events, 2, NULL);
+            
+            if (n < 0) {
+                NSLog(@"kevent: %s", strerror(errno));
+                continue;
+            }
+            if (n == 0) {
+                continue;
+            }
+            Locker l(_lock);
+
+            // should process twice, first for reading, second for dead children.
+            
+            std::for_each(events, events +  n, [&](const struct kevent &e){
+                
+                if (e.filter != EVFILT_READ) return;
+                int fd = (int)e.ident;
+                if (e.flags & EV_EOF) {
+                    NSLog(@"EV_EOF %d", fd);
+                    return;
+                }
+                
+                if (e.flags & EV_ERROR) {
+                    NSLog(@"EV_ERROR %d", fd);
+                    return;
+                }
+                
+                auto iter = find_fd(_table, fd);
+                if (iter == _table.end() || iter->controller == nil) {
+                    
+                    NSLog(@"Closing fd %d (not found)", fd);
+                    close(fd); // should automatically remove itself from kevent
+                    iter->fd = -1;
+                } else {
+                    BOOL ok = read(fd, iter->controller);
+                    if (!ok) {
+                        NSLog(@"Closing fd %d (eof)", fd);
+                        close(fd); // should automatically remove itself from kevent
+                        iter->fd = -1;
+                    }
+                }
+            });
+
+            std::for_each(events, events +  n, [&](const struct kevent &e){
+                
+                if (e.filter != EVFILT_PROC) return;
+                
+                pid_t pid = (pid_t)e.ident;
+
+                int status = 0;
+                for(;;) {
+                    int ok = waitpid(pid, &status, WNOHANG);
+                    if (ok >= 0) break;
+                    if (errno == EINTR) continue;
+                    NSLog(@"waitpid(%d): %s", pid, strerror(errno));
+                    break;
+                }
+                
+                
+                auto iter = find_pid(_table, pid);
+                if (iter == _table.end()) {
+                    
+                } else {
+                    if (iter->fd >= 0) {
+
+                        // check for pending i/o ?
+
+                        if (iter->controller)
+                            read(iter->fd, iter->controller);
+                        NSLog(@"Closing fd %d (child exited)", iter->fd);
+                        close(iter->fd);
+                        iter->fd = -1;
+                    }
+                    [iter->controller childFinished: status];
+
+                    [iter->controller release];
+                    iter->controller = nil;
+                    *iter = std::move(_table.back());
+                    _table.pop_back();
+                }
+                
+                NSLog(@"Child %d finished", pid);
+            });
+        }
+    }
+}
+
+@end

Emulators/Apple80.mm.ragel

@@ -220,26 +220,26 @@
              
              | 0x80 .. 0x9f ${
                  /* uppercase inverse/normal */
-                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flag = _context.flags ^ Screen::FlagInverse;
                  screen->putc(fc - 0x40, _context.cursor, flag);
              } $advance
              
              | 0xa0 .. 0xbf ${
                  /* special inverse/normal */
-                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flag = _context.flags ^ Screen::FlagInverse;
                  screen->putc(fc - 0x80, _context.cursor, flag);
              } $advance
              
              | 0xc0 .. 0xdf ${
                  /* uppercase normal / mouse text. */
-                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flag = _context.flags ^ Screen::FlagInverse;
                  if (flag) flag |= Screen::FlagMouseText;
                  screen->putc(fc - 0x80, _context.cursor, flag);
              } $advance
              
              | 0xe0 .. 0xff ${
                  /* special inverse/normal */
-                 uint8_t flag = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flag = _context.flags ^ Screen::FlagInverse;
                  screen->putc(fc - 0x80, _context.cursor, flag);
              } $advance
              

Emulators/GNOConsole.mm.ragel

@@ -357,7 +357,7 @@
                     screen->eraseRect(tmp);
              }
              
-             // hmmm ... embedded control characters seem to be processed as control characters...
+             # hmmm ... embedded control characters seem to be processed as control characters...
              | 0x1e arg1 arg2 ${
                 // CTRL('^'):
                 // goto x y
@@ -390,9 +390,6 @@
 @implementation GNOConsole
 
 
-
-
-
 +(void)load
 {
     [EmulatorManager registerClass: self];

Emulators/GSOSConsole.mm.ragel

@@ -178,7 +178,7 @@ static void advance(Screen *screen, gsos_context &ctx) {
                   */
                  if (cursor.y < window.maxY()-1) cursor.y++;
                  else if (_context.consScroll)
-                 screen->scrollUp(window);
+                    screen->scrollUp(window);
              }
 
              | 0x0b ${
@@ -420,26 +420,26 @@ static void advance(Screen *screen, gsos_context &ctx) {
 
              | 0x80 .. 0x9f ${
                  /* uppercase inverse/normal */
-                 uint8_t flags = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flags = _context.flags ^ Screen::FlagInverse;
                  screen->putc(fc - 0x40, cursor, flags);
              } $advance_if
 
              | 0xa0 .. 0xbf ${
                  /* special inverse/normal */
-                 uint8_t flags = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flags = _context.flags ^ Screen::FlagInverse;
                  screen->putc(fc - 0x80, cursor, flags);
              } $advance_if
 
              | 0xc0 .. 0xdf ${
                  /* uppercase normal / mouse text. */
-                 uint8_t flags = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flags = _context.flags ^ Screen::FlagInverse;
                  if (flags) flags |= Screen::FlagMouseText;
                  screen->putc(fc - 0x80, cursor, flags);
              } $advance_if
 
              | 0xe0 .. 0xff ${
                  /* special inverse/normal */
-                 uint8_t flags = ~(_context.flags & Screen::FlagInverse);
+                 uint8_t flags = _context.flags ^ Screen::FlagInverse;
                  screen->putc(fc - 0x80, cursor, flags);
              } $advance_if
              

Info.plist

@@ -21,7 +21,7 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>1</string>
+	<string>3</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>

README.md

@@ -0,0 +1,12 @@
+# TwoTerm
+Apple-II inspired terminal emulator for OS X
+
+Uses the Apple II character generator font but also emulates the GS/OS Console, GNO/ME Console, etc.
+
+You'll probably need a [termcap](https://github.com/ksherlock/a2-terminfo) entry.
+
+
+
+![](screenshots/vim.png?raw=true)
+
+![](screenshots/cal.png?raw=true)

TermWindowController.h

@@ -7,7 +7,7 @@
 //
 
 #import <Cocoa/Cocoa.h>
-
+#include <atomic>
 
 @class EmulatorView;
 @class ColorView;
@@ -25,12 +25,6 @@
     
     NSObject <Emulator> *_emulator;
     
-    int _fd;
-    pid_t _pid;
-    
-    dispatch_source_t _read_source;
-    dispatch_source_t _wait_source;
-    
 }
 
 @property (nonatomic, retain) NSDictionary *parameters;
@@ -41,5 +35,7 @@
 @property (nonatomic, retain) NSObject<Emulator> *emulator;
 
 -(void)initPTY;
+-(void)childFinished: (int)status;
+-(void)processData: (const void *)buffer size: (size_t)size;
 
 @end

TermWindowController.mm

@@ -11,8 +11,11 @@
 #import "CurveView.h"
 #import "EmulatorWindow.h"
 
-//#import "VT52.h"
-//#import "PTSE.h"
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+#include <atomic>
+
 
 #import "Defaults.h"
 
@@ -28,6 +31,8 @@
 #include <string>
 #include <vector>
 
+#include "ChildMonitor.h"
+
 @implementation TermWindowController
 
 @synthesize emulator = _emulator;
@@ -43,12 +48,13 @@
 
 -(void)dealloc
 {
+    [[ChildMonitor monitor] removeController: self];
+    
     [_emulator release];
     [_emulatorView release];
     [_colorView release];
 
     [_parameters release];
-
     
     [super dealloc];
 }
@@ -63,16 +69,30 @@
 -(void)initPTY
 {
     static std::string username;
+    static std::string terminfo;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        // getlogin() sometimes returns crap.
+        username = [NSUserName() UTF8String];
+        char *cp = getenv("TERMINFO_DIRS");
+        if (cp && *cp) {
+            terminfo = cp;
+            terminfo.push_back(':');
+        }
+        NSString *s = [[NSBundle mainBundle] resourcePath];
+        s = [s stringByAppendingPathComponent: @"terminfo"];
+        terminfo += [s UTF8String];
+    });
+    
+    
+    pid_t pid;
+    int fd;
 
     struct termios term;
     struct winsize ws = [_emulator defaultSize];
     
     memset(&term, 0, sizeof(term));
     
-    //term.c_oflag = OPOST | ONLCR;
-    //term.c_lflag = ECHO;
-    //term.c_iflag = ICRNL; // | ICANON | ECHOE | ISIG;
-    
     term.c_oflag = TTYDEF_OFLAG;
     term.c_lflag = TTYDEF_LFLAG;
     term.c_iflag = TTYDEF_IFLAG;
@@ -86,21 +106,16 @@
         [_emulator initTerm: &term];
     
     
-    // getlogin() sometimes returns crap.
-    if (username.empty()) {
-        username = [NSUserName() UTF8String];
-    }
-    //NSLog(@"%@ %s %s", NSUserName(), getlogin(), getpwent()->pw_name);
-    _pid = forkpty(&_fd, NULL, &term, &ws);
+   pid = forkpty(&fd, NULL, &term, &ws);
     
-    if (_pid < 0)
+    if (pid < 0)
     {
         fprintf(stderr, "forkpty failed\n");
         fflush(stderr);
         
         return;
     }
-    if (_pid == 0)
+    if (pid == 0)
     {
         
         std::vector<const char *> environ;
@@ -115,8 +130,12 @@
         
         s.append("TERM=");
         s.append([_emulator termName]);
-        
+        s.append(1, (char)0);
+
+        s.append("TERMINFO_DIRS=");
+        s.append(terminfo.c_str());
         s.append(1, (char)0); 
+
         s.append(1, (char)0);
         
         for (std::string::size_type index = 0;;)
@@ -172,145 +191,18 @@
 
     [window setMinSize: [window frame].size];
 
-    [_emulatorView setFd: _fd];
-    [self monitor];
- 
-    /*
-    if (!_childMonitor)
-    {
-        _childMonitor = [ChildMonitor new];
-        [_childMonitor setDelegate: _emulatorView];
-    }
-    */
+    [_emulatorView setFd: fd];
+
+    [[ChildMonitor monitor] addController: self pid: pid fd: fd];
 }
 
--(void)monitor {
 
-    int fd = _fd;
-    int pid = _pid;
+-(void)childFinished: (int)status {
+    [_emulatorView childFinished: status];
+}
 
-    int flags;
-    // non-blocking io.
-    if (fcntl(_fd, F_GETFL, &flags) < 0) flags = 0;
-    fcntl(_fd, F_SETFL, flags | O_NONBLOCK);
-    
-    [_emulatorView childBegan];
-
-    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
-
-    _wait_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_PROC,
-                                              pid, DISPATCH_PROC_EXIT, queue);
-    if (_wait_source)
-    {
-        
-        dispatch_source_set_event_handler(_wait_source, ^{
-            
-            int status = 0;
-            int ok;
-            for(;;) {
-                ok = waitpid(pid, &status, WNOHANG);
-                if (ok >= 0) break;
-                if (errno == EINTR) continue;
-                break;
-            }
-            _pid = 0;
-            //dispatch_async(dispatch_get_main_queue(), ^(){
-            [_emulatorView childFinished: status];
-            //});
-            
-            dispatch_source_cancel(_wait_source);
-            dispatch_release(_wait_source);
-            _wait_source = nullptr;
-        });
-            
-        dispatch_resume(_wait_source);
-    }
-
-#if 0
-    dispatch_io_t io = dispatch_io_create(DISPATCH_IO_STREAM, fd, queue, ^(int error){
-        close(fd);
-        NSLog(@"dispatch_io_create: %d", error);
-    });
-    
-    dispatch_io_read(io, 0, SIZE_MAX, queue, ^(bool done, dispatch_data_t data, int error){
-        if (error) {
-            NSLog(@"dispatch_io_read: %d", error);
-            dispatch_io_close(io, DISPATCH_IO_STOP);
-            return;
-        }
-        
-        dispatch_data_apply(data, ^(dispatch_data_t, size_t, const void *buffer, size_t size){
-            [_emulatorView processData: (uint8_t *)buffer size: size];
-            return true;
-        } );
-        
-        if (done) {
-            NSLog(@"closing fd");
-            dispatch_io_close(io, DISPATCH_IO_STOP);
-            return;
-        }
-        
-    });
-    
-#else
-    _read_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ,
-                                                          fd, 0, queue);
-    if (_read_source)
-    {
-        // Install the event handler
-        dispatch_source_set_event_handler(_read_source, ^{
-
-            static uint8_t sbuffer[1024];
-            size_t estimated = dispatch_source_get_data(_read_source);
-            estimated = std::max(estimated, sizeof(sbuffer));
-            
-            uint8_t *buffer = estimated > sizeof(sbuffer) ? (uint8_t *)malloc(estimated) : sbuffer;
-            if (buffer)
-            {
-                ssize_t actual;
-                
-                for (;;) {
-                    actual = read(fd, buffer, estimated);
-                    //fprintf(stderr, "read: %ld\n", actual);
-                    if (actual < 0) {
-                        if (errno == EINTR) continue;
-
-                        if (errno == EAGAIN) {
-                            if (buffer != sbuffer) free(buffer);
-                            return;
-                        }
-
-                        NSLog(@"read: %s", strerror(errno));
-                        dispatch_source_cancel(_read_source);
-                        dispatch_release(_read_source);
-                        _read_source = nullptr;
-                    }
-                    break;
-                }
-
-                if (actual > 0) [_emulatorView processData: buffer size: actual];
-
-                if (buffer != sbuffer) free(buffer);
-
-                if (actual == 0) {
-                    dispatch_source_cancel(_read_source);
-                    dispatch_release(_read_source);
-                    _read_source = nullptr;
-                }
-            }
-        });
-
-        
-        dispatch_source_set_cancel_handler(_read_source, ^{
-            NSLog(@"closing fd");
-            _fd = -1;
-            [_emulatorView setFd: -1];
-            close(fd);
-        });
-        
-        dispatch_resume(_read_source);
-    }
-#endif
+-(void)processData: (const void *)buffer size: (size_t)size {
+    [_emulatorView processData: (uint8_t *)buffer size: size];
 }
 
 #pragma mark -
@@ -379,31 +271,7 @@
 
 -(void)windowWillClose:(NSNotification *)notification
 {
-
-
-    if (_wait_source) {
-        dispatch_source_cancel(_wait_source);
-        dispatch_release(_wait_source);
-    }
-    
-    if (_read_source) {
-        dispatch_source_cancel(_read_source);
-        dispatch_release(_read_source);
-    }
-    
-    int status;
-    int ok;
-    if (_pid) {
-        kill(_pid, 9);
-        for(;;) {
-            ok = waitpid(_pid, &status, 0);
-            if (ok >= 0) break;
-            if (errno == EINTR) continue;
-            perror("waitpid: ");
-            break;
-        }
-    }
-
+    [[ChildMonitor monitor] removeController: self];
     [self autorelease];
 }
 

TwoTerm.xcodeproj/project.pbxproj

@@ -33,6 +33,7 @@
 		B61EF7D81482FB6D008C1891 /* titlebar-left.png in Resources */ = {isa = PBXBuildFile; fileRef = B61EF7D51482FB6D008C1891 /* titlebar-left.png */; };
 		B61EF7D91482FB6D008C1891 /* titlebar-right.png in Resources */ = {isa = PBXBuildFile; fileRef = B61EF7D61482FB6D008C1891 /* titlebar-right.png */; };
 		B638188214A179D60027D007 /* ColorView.m in Sources */ = {isa = PBXBuildFile; fileRef = B638188114A179D60027D007 /* ColorView.m */; };
+		B6407805201CE93500D3F2D1 /* GNOConsole.mm.ragel in Sources */ = {isa = PBXBuildFile; fileRef = B612F45B12DD5DF1005D1B77 /* GNOConsole.mm.ragel */; };
 		B66412391480A070003BC8D3 /* EmulatorWindow.m in Sources */ = {isa = PBXBuildFile; fileRef = B66412381480A070003BC8D3 /* EmulatorWindow.m */; };
 		B675F4A81E540394004B0D9C /* Screen.cpp in Sources */ = {isa = PBXBuildFile; fileRef = B612F44D12DD5DAD005D1B77 /* Screen.cpp */; };
 		B675F4A91E561D20004B0D9C /* Apple80.mm.ragel in Sources */ = {isa = PBXBuildFile; fileRef = B612F45712DD5DF1005D1B77 /* Apple80.mm.ragel */; };
@@ -43,7 +44,7 @@
 		B67B3CE612B6FA040033AE07 /* a2-charset-80.png in Resources */ = {isa = PBXBuildFile; fileRef = B67B3CE412B6FA040033AE07 /* a2-charset-80.png */; };
 		B6801BD912EB549300B22E9E /* vt100-charset.png in Resources */ = {isa = PBXBuildFile; fileRef = B6801BD812EB549300B22E9E /* vt100-charset.png */; };
 		B68E632A12FF909D00EAFF5F /* ExampleView.m in Sources */ = {isa = PBXBuildFile; fileRef = B68E632912FF909C00EAFF5F /* ExampleView.m */; };
-		B6ACA2AC1E5C8BEC000E774B /* GNOConsole.mm in Sources */ = {isa = PBXBuildFile; fileRef = B6ACA2AB1E5C8BEC000E774B /* GNOConsole.mm */; };
+		B69E32A920221C9E0086D7B1 /* ChildMonitor.mm in Sources */ = {isa = PBXBuildFile; fileRef = B69E32A820221C9E0086D7B1 /* ChildMonitor.mm */; };
 		B6ACA2AD1E614E38000E774B /* VT52.mm in Sources */ = {isa = PBXBuildFile; fileRef = B612F46312DD5DF1005D1B77 /* VT52.mm */; };
 		B6ACA2AF1E635CEC000E774B /* vt52-charset.png in Resources */ = {isa = PBXBuildFile; fileRef = B6ACA2AE1E635CEC000E774B /* vt52-charset.png */; };
 		B6C704EF15CCC64100CC0401 /* titlebar-center@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = B6C704EC15CCC64100CC0401 /* titlebar-center@2x.png */; };
@@ -102,6 +103,10 @@
 		29B97325FDCFA39411CA2CEA /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = /System/Library/Frameworks/Foundation.framework; sourceTree = "<absolute>"; };
 		8D1107310486CEB800E47090 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		8D1107320486CEB800E47090 /* TwoTerm.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = TwoTerm.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		B60B98712022BAF100E688E3 /* appleIIgs.ti */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = appleIIgs.ti; sourceTree = "<group>"; };
+		B60B98732022BAF100E688E3 /* gno-console.ti */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "gno-console.ti"; sourceTree = "<group>"; };
+		B60B98742022BAF100E688E3 /* gsos-console.ti */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "gsos-console.ti"; sourceTree = "<group>"; };
+		B60B98762022BAF100E688E3 /* proterm-special.ti */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "proterm-special.ti"; sourceTree = "<group>"; };
 		B60EBD1111E8DEEF00C1974F /* QuartzCore.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = QuartzCore.framework; path = /System/Library/Frameworks/QuartzCore.framework; sourceTree = "<absolute>"; };
 		B60EBDE111E90FC300C1974F /* ScanLineFilter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ScanLineFilter.h; sourceTree = "<group>"; };
 		B60EBDE211E90FC300C1974F /* ScanLineFilter.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ScanLineFilter.m; sourceTree = "<group>"; };
@@ -159,6 +164,8 @@
 		B6801BD812EB549300B22E9E /* vt100-charset.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "vt100-charset.png"; sourceTree = "<group>"; };
 		B68E632812FF909C00EAFF5F /* ExampleView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ExampleView.h; sourceTree = "<group>"; };
 		B68E632912FF909C00EAFF5F /* ExampleView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ExampleView.m; sourceTree = "<group>"; };
+		B69E32A820221C9E0086D7B1 /* ChildMonitor.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = ChildMonitor.mm; sourceTree = "<group>"; };
+		B69E32AA20221CCA0086D7B1 /* ChildMonitor.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ChildMonitor.h; sourceTree = "<group>"; };
 		B6ACA2AB1E5C8BEC000E774B /* GNOConsole.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = GNOConsole.mm; sourceTree = "<group>"; };
 		B6ACA2AE1E635CEC000E774B /* vt52-charset.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "vt52-charset.png"; sourceTree = "<group>"; };
 		B6C173901D31D2B80024E360 /* GSOSConsole.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GSOSConsole.h; sourceTree = "<group>"; };
@@ -200,6 +207,8 @@
 				B6EBE2B411E0EA9100EA0458 /* CharacterGenerator.mm */,
 				B60EBDE111E90FC300C1974F /* ScanLineFilter.h */,
 				B60EBDE211E90FC300C1974F /* ScanLineFilter.m */,
+				B69E32A820221C9E0086D7B1 /* ChildMonitor.mm */,
+				B69E32AA20221CCA0086D7B1 /* ChildMonitor.h */,
 			);
 			name = Classes;
 			sourceTree = "<group>";
@@ -260,6 +269,7 @@
 		29B97317FDCFA39411CA2CEA /* Resources */ = {
 			isa = PBXGroup;
 			children = (
+				B60B98702022BAF100E688E3 /* a2-terminfo */,
 				B60EBDE711E9143F00C1974F /* ScanLineFilter.cikernel */,
 				B66979CE11E6BCAE002ED475 /* images */,
 				8D1107310486CEB800E47090 /* Info.plist */,
@@ -281,6 +291,17 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		B60B98702022BAF100E688E3 /* a2-terminfo */ = {
+			isa = PBXGroup;
+			children = (
+				B60B98712022BAF100E688E3 /* appleIIgs.ti */,
+				B60B98732022BAF100E688E3 /* gno-console.ti */,
+				B60B98742022BAF100E688E3 /* gsos-console.ti */,
+				B60B98762022BAF100E688E3 /* proterm-special.ti */,
+			);
+			path = "a2-terminfo";
+			sourceTree = "<group>";
+		};
 		B612F44612DD5DAD005D1B77 /* cpp */ = {
 			isa = PBXGroup;
 			children = (
@@ -375,6 +396,7 @@
 				8D11072C0486CEB800E47090 /* Sources */,
 				8D11072E0486CEB800E47090 /* Frameworks */,
 				B61D0D57125B728D001C713B /* CopyFiles */,
+				B60B98802022BF5900E688E3 /* ShellScript */,
 			);
 			buildRules = (
 				B6C173931D32A8840024E360 /* PBXBuildRule */,
@@ -441,6 +463,22 @@
 		};
 /* End PBXResourcesBuildPhase section */
 
+/* Begin PBXShellScriptBuildPhase section */
+		B60B98802022BF5900E688E3 /* ShellScript */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "for x in \"$PROJECT_DIR/a2-terminfo/\"*.ti ; do\ntic -N -s -o \"$BUILT_PRODUCTS_DIR/$UNLOCALIZED_RESOURCES_FOLDER_PATH/terminfo\" \"$x\"\ndone";
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
 		8D11072C0486CEB800E47090 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
@@ -449,6 +487,8 @@
 				B675F4A91E561D20004B0D9C /* Apple80.mm.ragel in Sources */,
 				B675F4AC1E56A7F2004B0D9C /* GSOSConsole.mm.ragel in Sources */,
 				B6D1CD071E577E7D00C4A6BC /* PTSE.mm.ragel in Sources */,
+				B69E32A920221C9E0086D7B1 /* ChildMonitor.mm in Sources */,
+				B6407805201CE93500D3F2D1 /* GNOConsole.mm.ragel in Sources */,
 				8D11072D0486CEB800E47090 /* main.m in Sources */,
 				256AC3DA0F4B6AC300CF3369 /* TwoTermAppDelegate.mm in Sources */,
 				B676063B11DEAD3500D6B66C /* TermWindowController.mm in Sources */,
@@ -457,7 +497,6 @@
 				B61D0D60125B7ACA001C713B /* NewTerminalWindowController.mm in Sources */,
 				B61D0D69125B8E06001C713B /* Defaults.m in Sources */,
 				B6ECFF271D2EEA2B00871A81 /* TextLabel.m in Sources */,
-				B6ACA2AC1E5C8BEC000E774B /* GNOConsole.mm in Sources */,
 				B612F45012DD5DAD005D1B77 /* iGeometry.cpp in Sources */,
 				B612F45112DD5DAD005D1B77 /* Lock.cpp in Sources */,
 				B612F45212DD5DAD005D1B77 /* OutputChannel.cpp in Sources */,

TwoTermAppDelegate.mm

@@ -31,6 +31,13 @@
     NSDictionary *parameters;
     CIFilter *filter;    
     
+#if 0
+    struct sigaction sa = {};
+    sa.sa_handler = SIG_IGN;
+    sa.sa_flags = SA_RESTART;
+    sigaction(SIGCHLD, &sa, NULL);
+#endif
+
     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
     
     [nc addObserver: self selector: @selector(newTerminal:) name: kNotificationNewTerminal object: nil];

cpp/Screen.cpp

@@ -321,7 +321,7 @@ void Screen::scrollRight(iRect rect, int n) {
         auto xIter = line.begin() + rect.minX();
         auto xEnd = line.begin() + rect.maxX();
         
-        auto iter = std::copy(xIter, xEnd-n, xEnd);
+        auto iter = std::copy_backward(xIter, xEnd-n, xEnd);
         while (n--) { --iter; *iter = char_info(); }
     }