python 中轮询套接字的问题
开始轮询循环后，第一次迭代后打印的所有消息都需要我在终端中按 Enter 键才能显示。
#!/usr/bin/python
import socket, select, os, pty, sys
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', 5007))
s.listen(5)
mypoll = select.poll()
mypoll.register(s.fileno() )
while True:
print "poll time"
subr = mypoll.poll()
for x in subr[0]:
if x == s.fileno():
conn, addr = s.accept()
pid, fd = pty.fork()
if pid != 0:
mypoll.register(fd)
print "done. go back to poll now"
else:
print "forked"
#handles new connection
else:
data = os.read(x,1024)
print data
After I begin the polling loop, all messages printed after the first iteration require me to press enter in the terminal for it to be displayed.
#!/usr/bin/python
import socket, select, os, pty, sys
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', 5007))
s.listen(5)
mypoll = select.poll()
mypoll.register(s.fileno() )
while True:
print "poll time"
subr = mypoll.poll()
for x in subr[0]:
if x == s.fileno():
conn, addr = s.accept()
pid, fd = pty.fork()
if pid != 0:
mypoll.register(fd)
print "done. go back to poll now"
else:
print "forked"
#handles new connection
else:
data = os.read(x,1024)
print data
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第一次迭代之后，您还没有注册 pty fd，然后轮询它吗？并且它的 fd 永远不会等于套接字 fd，因此您将 os.read pty fd。这不是现在从你的终端上读取的吗？那么输入 return 不会导致它“打印数据”吗？
After the first iteration, haven't you registered the pty fd, and are then polling it? And its fd will never be equal to the socket fd, so you will then os.read the pty fd. And isn't that now reading from your terminal? And so won't typing a return cause it to "print data"?