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Mini Shell
Mini Shell
import os
import sys
import string
from Tkinter import *
from ScrolledText import ScrolledText
from Dialog import Dialog
import signal
BUFSIZE = 512
class ShellWindow(ScrolledText):
def __init__(self, master=None, shell=None, **cnf):
if not shell:
try:
shell = os.environ['SHELL']
except KeyError:
shell = '/bin/sh'
shell = shell + ' -i'
args = string.split(shell)
shell = args[0]
apply(ScrolledText.__init__, (self, master), cnf)
self.pos = '1.0'
self.bind('<Return>', self.inputhandler)
self.bind('<Control-c>', self.sigint)
self.bind('<Control-t>', self.sigterm)
self.bind('<Control-k>', self.sigkill)
self.bind('<Control-d>', self.sendeof)
self.pid, self.fromchild, self.tochild = spawn(shell, args)
self.tk.createfilehandler(self.fromchild, READABLE,
self.outputhandler)
def outputhandler(self, file, mask):
data = os.read(file, BUFSIZE)
if not data:
self.tk.deletefilehandler(file)
pid, sts = os.waitpid(self.pid, 0)
print 'pid', pid, 'status', sts
self.pid = None
detail = sts>>8
cause = sts & 0xff
if cause == 0:
msg = "exit status %d" % detail
else:
msg = "killed by signal %d" % (cause & 0x7f)
if cause & 0x80:
msg = msg + " -- core dumped"
Dialog(self.master,
text=msg,
title="Exit status",
bitmap='warning',
default=0,
strings=('OK',))
return
self.insert(END, data)
self.pos = self.index("end - 1 char")
self.yview_pickplace(END)
def inputhandler(self, *args):
if not self.pid:
self.no_process()
return "break"
self.insert(END, "\n")
line = self.get(self.pos, "end - 1 char")
self.pos = self.index(END)
os.write(self.tochild, line)
return "break"
def sendeof(self, *args):
if not self.pid:
self.no_process()
return "break"
os.close(self.tochild)
return "break"
def sendsig(self, sig):
if not self.pid:
self.no_process()
return "break"
os.kill(self.pid, sig)
return "break"
def sigint(self, *args):
return self.sendsig(signal.SIGINT)
def sigquit(self, *args):
return self.sendsig(signal.SIGQUIT)
def sigterm(self, *args):
return self.sendsig(signal.SIGTERM)
def sigkill(self, *args):
return self.sendsig(signal.SIGKILL)
def no_process(self):
Dialog(self.master,
text="No active process",
title="No process",
bitmap='error',
default=0,
strings=('OK',))
MAXFD = 100 # Max number of file descriptors (os.getdtablesize()???)
def spawn(prog, args):
p2cread, p2cwrite = os.pipe()
c2pread, c2pwrite = os.pipe()
pid = os.fork()
if pid == 0:
# Child
for i in 0, 1, 2:
try:
os.close(i)
except os.error:
pass
if os.dup(p2cread) <> 0:
sys.stderr.write('popen2: bad read dup\n')
if os.dup(c2pwrite) <> 1:
sys.stderr.write('popen2: bad write dup\n')
if os.dup(c2pwrite) <> 2:
sys.stderr.write('popen2: bad write dup\n')
os.closerange(3, MAXFD)
try:
os.execvp(prog, args)
finally:
sys.stderr.write('execvp failed\n')
os._exit(1)
os.close(p2cread)
os.close(c2pwrite)
return pid, c2pread, p2cwrite
def test():
shell = string.join(sys.argv[1:])
root = Tk()
root.minsize(1, 1)
if shell:
w = ShellWindow(root, shell=shell)
else:
w = ShellWindow(root)
w.pack(expand=1, fill=BOTH)
w.focus_set()
w.tk.mainloop()
if __name__ == '__main__':
test()
Zerion Mini Shell 1.0