Demo/tkinter/guido/ShellWindow.py

   1 import os
   2 import sys
   3 import string
   4 from Tkinter import *
   5 from ScrolledText import ScrolledText
   6 from Dialog import Dialog
   7 import signal
   8
   9 BUFSIZE = 512
  10
  11 class ShellWindow(ScrolledText):
  12
  13     def __init__(self, master=None, shell=None, **cnf):
  14         if not shell:
  15             try:
  16                 shell = os.environ['SHELL']
  17             except KeyError:
  18                 shell = '/bin/sh'
  19             shell = shell + ' -i'
  20         args = string.split(shell)
  21         shell = args[0]
  22
  23         apply(ScrolledText.__init__, (self, master), cnf)
  24         self.pos = '1.0'
  25         self.bind('<Return>', self.inputhandler)
  26         self.bind('<Control-c>', self.sigint)
  27         self.bind('<Control-t>', self.sigterm)
  28         self.bind('<Control-k>', self.sigkill)
  29         self.bind('<Control-d>', self.sendeof)
  30
  31         self.pid, self.fromchild, self.tochild = spawn(shell, args)
  32         self.tk.createfilehandler(self.fromchild, READABLE,
  33                                   self.outputhandler)
  34
  35     def outputhandler(self, file, mask):
  36         data = os.read(file, BUFSIZE)
  37         if not data:
  38             self.tk.deletefilehandler(file)
  39             pid, sts = os.waitpid(self.pid, 0)
  40             print 'pid', pid, 'status', sts
  41             self.pid = None
  42             detail = sts>>8
  43             cause = sts & 0xff
  44             if cause == 0:
  45                 msg = "exit status %d" % detail
  46             else:
  47                 msg = "killed by signal %d" % (cause & 0x7f)
  48                 if cause & 0x80:
  49                     msg = msg + " -- core dumped"
  50             Dialog(self.master,
  51                    text=msg,
  52                    title="Exit status",
  53                    bitmap='warning',
  54                    default=0,
  55                    strings=('OK',))
  56             return
  57         self.insert(END, data)
  58         self.pos = self.index("end - 1 char")
  59         self.yview_pickplace(END)
  60
  61     def inputhandler(self, *args):
  62         if not self.pid:
  63             self.no_process()
  64             return "break"
  65         self.insert(END, "\n")
  66         line = self.get(self.pos, "end - 1 char")
  67         self.pos = self.index(END)
  68         os.write(self.tochild, line)
  69         return "break"
  70
  71     def sendeof(self, *args):
  72         if not self.pid:
  73             self.no_process()
  74             return "break"
  75         os.close(self.tochild)
  76         return "break"
  77
  78     def sendsig(self, sig):
  79         if not self.pid:
  80             self.no_process()
  81             return "break"
  82         os.kill(self.pid, sig)
  83         return "break"
  84
  85     def sigint(self, *args):
  86         return self.sendsig(signal.SIGINT)
  87
  88     def sigquit(self, *args):
  89         return self.sendsig(signal.SIGQUIT)
  90
  91     def sigterm(self, *args):
  92         return self.sendsig(signal.SIGTERM)
  93
  94     def sigkill(self, *args):
  95         return self.sendsig(signal.SIGKILL)
  96
  97     def no_process(self):
  98         Dialog(self.master,
  99                text="No active process",
 100                title="No process",
 101                bitmap='error',
 102                default=0,
 103                strings=('OK',))
 104
 105 MAXFD = 100     # Max number of file descriptors (os.getdtablesize()???)
 106
 107 def spawn(prog, args):
 108     p2cread, p2cwrite = os.pipe()
 109     c2pread, c2pwrite = os.pipe()
 110     pid = os.fork()
 111     if pid == 0:
 112         # Child
 113         for i in 0, 1, 2:
 114             try:
 115                 os.close(i)
 116             except os.error:
 117                 pass
 118         if os.dup(p2cread) <> 0:
 119             sys.stderr.write('popen2: bad read dup\n')
 120         if os.dup(c2pwrite) <> 1:
 121             sys.stderr.write('popen2: bad write dup\n')
 122         if os.dup(c2pwrite) <> 2:
 123             sys.stderr.write('popen2: bad write dup\n')
 124         os.closerange(3, MAXFD)
 125         try:
 126             os.execvp(prog, args)
 127         finally:
 128             sys.stderr.write('execvp failed\n')
 129             os._exit(1)
 130     os.close(p2cread)
 131     os.close(c2pwrite)
 132     return pid, c2pread, p2cwrite
 133
 134 def test():
 135     shell = string.join(sys.argv[1:])
 136     root = Tk()
 137     root.minsize(1, 1)
 138     if shell:
 139         w = ShellWindow(root, shell=shell)
 140     else:
 141         w = ShellWindow(root)
 142     w.pack(expand=1, fill=BOTH)
 143     w.focus_set()
 144     w.tk.mainloop()
 145
 146 if __name__ == '__main__':
 147     test()