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annotate Lib/pty.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents f889458c65cc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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b6f52c1ef6da More trivial comment -> docstring transformations by Ka-Ping Yee,
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1 """Pseudo terminal utilities."""
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2
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3 # Bugs: No signal handling. Doesn't set slave termios and window size.
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4 # Only tested on Linux.
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5 # See: W. Richard Stevens. 1992. Advanced Programming in the
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6 # UNIX Environment. Chapter 19.
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7 # Author: Steen Lumholt -- with additions by Guido.
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8
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9 from select import select
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10 import os
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11 import tty
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12
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13 __all__ = ["openpty","fork","spawn"]
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14
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15 STDIN_FILENO = 0
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16 STDOUT_FILENO = 1
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17 STDERR_FILENO = 2
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18
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19 CHILD = 0
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20
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21 def openpty():
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22 """openpty() -> (master_fd, slave_fd)
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23 Open a pty master/slave pair, using os.openpty() if possible."""
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24
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25 try:
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26 return os.openpty()
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27 except (AttributeError, OSError):
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28 pass
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29 master_fd, slave_name = _open_terminal()
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30 slave_fd = slave_open(slave_name)
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31 return master_fd, slave_fd
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32
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33 def master_open():
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34 """master_open() -> (master_fd, slave_name)
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35 Open a pty master and return the fd, and the filename of the slave end.
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36 Deprecated, use openpty() instead."""
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37
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38 try:
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39 master_fd, slave_fd = os.openpty()
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40 except (AttributeError, OSError):
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41 pass
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42 else:
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43 slave_name = os.ttyname(slave_fd)
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44 os.close(slave_fd)
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45 return master_fd, slave_name
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46
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47 return _open_terminal()
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48
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49 def _open_terminal():
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50 """Open pty master and return (master_fd, tty_name).
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51 SGI and generic BSD version, for when openpty() fails."""
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52 try:
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53 import sgi
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54 except ImportError:
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55 pass
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56 else:
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57 try:
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58 tty_name, master_fd = sgi._getpty(os.O_RDWR, 0666, 0)
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59 except IOError, msg:
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60 raise os.error, msg
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61 return master_fd, tty_name
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62 for x in 'pqrstuvwxyzPQRST':
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63 for y in '0123456789abcdef':
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64 pty_name = '/dev/pty' + x + y
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65 try:
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66 fd = os.open(pty_name, os.O_RDWR)
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67 except os.error:
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68 continue
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69 return (fd, '/dev/tty' + x + y)
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70 raise os.error, 'out of pty devices'
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71
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72 def slave_open(tty_name):
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73 """slave_open(tty_name) -> slave_fd
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74 Open the pty slave and acquire the controlling terminal, returning
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75 opened filedescriptor.
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76 Deprecated, use openpty() instead."""
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77
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78 result = os.open(tty_name, os.O_RDWR)
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79 try:
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80 from fcntl import ioctl, I_PUSH
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81 except ImportError:
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82 return result
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83 try:
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84 ioctl(result, I_PUSH, "ptem")
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85 ioctl(result, I_PUSH, "ldterm")
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86 except IOError:
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87 pass
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88 return result
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89
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90 def fork():
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91 """fork() -> (pid, master_fd)
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92 Fork and make the child a session leader with a controlling terminal."""
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93
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94 try:
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95 pid, fd = os.forkpty()
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96 except (AttributeError, OSError):
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97 pass
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98 else:
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99 if pid == CHILD:
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100 try:
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101 os.setsid()
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102 except OSError:
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103 # os.forkpty() already set us session leader
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104 pass
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105 return pid, fd
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106
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107 master_fd, slave_fd = openpty()
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108 pid = os.fork()
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109 if pid == CHILD:
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110 # Establish a new session.
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111 os.setsid()
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112 os.close(master_fd)
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113
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114 # Slave becomes stdin/stdout/stderr of child.
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115 os.dup2(slave_fd, STDIN_FILENO)
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116 os.dup2(slave_fd, STDOUT_FILENO)
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117 os.dup2(slave_fd, STDERR_FILENO)
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118 if (slave_fd > STDERR_FILENO):
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119 os.close (slave_fd)
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120
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121 # Explicitly open the tty to make it become a controlling tty.
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122 tmp_fd = os.open(os.ttyname(STDOUT_FILENO), os.O_RDWR)
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123 os.close(tmp_fd)
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124 else:
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125 os.close(slave_fd)
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126
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127 # Parent and child process.
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128 return pid, master_fd
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129
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130 def _writen(fd, data):
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131 """Write all the data to a descriptor."""
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132 while data != '':
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133 n = os.write(fd, data)
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134 data = data[n:]
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135
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136 def _read(fd):
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137 """Default read function."""
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138 return os.read(fd, 1024)
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139
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140 def _copy(master_fd, master_read=_read, stdin_read=_read):
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141 """Parent copy loop.
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142 Copies
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143 pty master -> standard output (master_read)
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144 standard input -> pty master (stdin_read)"""
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145 fds = [master_fd, STDIN_FILENO]
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146 while True:
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
147 rfds, wfds, xfds = select(fds, [], [])
15870
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
148 if master_fd in rfds:
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
149 data = master_read(master_fd)
74979
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
150 if not data: # Reached EOF.
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
151 fds.remove(master_fd)
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
152 else:
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
153 os.write(STDOUT_FILENO, data)
15870
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
154 if STDIN_FILENO in rfds:
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
155 data = stdin_read(STDIN_FILENO)
74979
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
156 if not data:
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
157 fds.remove(STDIN_FILENO)
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
158 else:
f889458c65cc Issue #2489: Fix bug in _copy loop that could consume 100% cpu on EOF.
Gregory P. Smith <greg@krypto.org>
parents: 40732
diff changeset
159 _writen(master_fd, data)
1875
8c9cc054c5ed New tty/pty modules by Steen; new urlparser.
Guido van Rossum <guido@python.org>
parents:
diff changeset
160
13058
53f4022c0cd5 Thomas Wouters <thomas@xs4all.net>:
Fred Drake <fdrake@acm.org>
parents: 11706
diff changeset
161 def spawn(argv, master_read=_read, stdin_read=_read):
15870
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
162 """Create a spawned process."""
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
163 if type(argv) == type(''):
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
164 argv = (argv,)
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
165 pid, master_fd = fork()
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
166 if pid == CHILD:
28089
14f65d661084 Get rid of many apply() calls.
Guido van Rossum <guido@python.org>
parents: 27507
diff changeset
167 os.execlp(argv[0], *argv)
24397
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
168 try:
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
169 mode = tty.tcgetattr(STDIN_FILENO)
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
170 tty.setraw(STDIN_FILENO)
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
171 restore = 1
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
172 except tty.error: # This is the same as termios.error
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
173 restore = 0
15870
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
174 try:
010d03853546 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 13322
diff changeset
175 _copy(master_fd, master_read, stdin_read)
24397
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
176 except (IOError, OSError):
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
177 if restore:
f6052aeb134f Patch #581705: Catch OSError, termios.error in spawn. 2.2 bugfix candidate.
Martin v. Löwis <martin@v.loewis.de>
parents: 17978
diff changeset
178 tty.tcsetattr(STDIN_FILENO, tty.TCSAFLUSH, mode)
32257
8c0394aec6dc [Bug #897935] Fix fd leak in pty.spawn(). Reported by James Henstridge; 2.3 bugfix candidate.
Andrew M. Kuchling <amk@amk.ca>
parents: 28089
diff changeset
179
8c0394aec6dc [Bug #897935] Fix fd leak in pty.spawn(). Reported by James Henstridge; 2.3 bugfix candidate.
Andrew M. Kuchling <amk@amk.ca>
parents: 28089
diff changeset
180 os.close(master_fd)