Mercurial > cpython-lru_cache-weakref

annotate Lib/pty.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents e4752f316053
children 6ca1c0d3ef19
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
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12 # Absurd: import termios and then delete it. This is to force an attempt
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13 # to import pty to raise an ImportError on platforms that lack termios.
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14 # Without this explicit import of termios here, some other module may
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15 # import tty first, which in turn imports termios and dies with an
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16 # ImportError then. But since tty *does* exist across platforms, that
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17 # leaves a damaged module object for tty in sys.modules, and the import
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18 # of tty here then appears to work despite that the tty imported is junk.
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19 import termios
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20 del termios
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21
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22 import tty
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23
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24 __all__ = ["openpty","fork","spawn"]
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25
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26 STDIN_FILENO = 0
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27 STDOUT_FILENO = 1
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28 STDERR_FILENO = 2
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29
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30 CHILD = 0
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31
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32 def openpty():
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33 """openpty() -> (master_fd, slave_fd)
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34 Open a pty master/slave pair, using os.openpty() if possible."""
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35
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36 try:
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37 return os.openpty()
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38 except (AttributeError, OSError):
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39 pass
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40 master_fd, slave_name = _open_terminal()
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41 slave_fd = slave_open(slave_name)
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42 return master_fd, slave_fd
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43
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44 def master_open():
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45 """master_open() -> (master_fd, slave_name)
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46 Open a pty master and return the fd, and the filename of the slave end.
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47 Deprecated, use openpty() instead."""
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48
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49 try:
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50 master_fd, slave_fd = os.openpty()
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51 except (AttributeError, OSError):
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52 pass
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53 else:
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54 slave_name = os.ttyname(slave_fd)
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55 os.close(slave_fd)
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56 return master_fd, slave_name
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57
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58 return _open_terminal()
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59
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60 def _open_terminal():
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61 """Open pty master and return (master_fd, tty_name).
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62 SGI and generic BSD version, for when openpty() fails."""
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63 try:
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64 import sgi
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65 except ImportError:
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66 pass
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67 else:
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68 try:
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69 tty_name, master_fd = sgi._getpty(os.O_RDWR, 0666, 0)
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70 except IOError, msg:
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71 raise os.error, msg
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72 return master_fd, tty_name
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73 for x in 'pqrstuvwxyzPQRST':
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74 for y in '0123456789abcdef':
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75 pty_name = '/dev/pty' + x + y
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76 try:
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77 fd = os.open(pty_name, os.O_RDWR)
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78 except os.error:
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79 continue
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80 return (fd, '/dev/tty' + x + y)
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81 raise os.error, 'out of pty devices'
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82
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83 def slave_open(tty_name):
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84 """slave_open(tty_name) -> slave_fd
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85 Open the pty slave and acquire the controlling terminal, returning
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86 opened filedescriptor.
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87 Deprecated, use openpty() instead."""
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88
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89 return os.open(tty_name, os.O_RDWR)
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90
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91 def fork():
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92 """fork() -> (pid, master_fd)
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93 Fork and make the child a session leader with a controlling terminal."""
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94
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95 try:
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96 pid, fd = os.forkpty()
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97 except (AttributeError, OSError):
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98 pass
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99 else:
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100 if pid == CHILD:
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101 try:
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102 os.setsid()
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103 except OSError:
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104 # os.forkpty() already set us session leader
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105 pass
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106 return pid, fd
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107
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108 master_fd, slave_fd = openpty()
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109 pid = os.fork()
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110 if pid == CHILD:
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111 # Establish a new session.
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112 os.setsid()
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113 os.close(master_fd)
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114
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115 # Slave becomes stdin/stdout/stderr of child.
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116 os.dup2(slave_fd, STDIN_FILENO)
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117 os.dup2(slave_fd, STDOUT_FILENO)
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118 os.dup2(slave_fd, STDERR_FILENO)
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119 if (slave_fd > STDERR_FILENO):
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120 os.close (slave_fd)
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121
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122 # Parent and child process.
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123 return pid, master_fd
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124
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125 def _writen(fd, data):
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126 """Write all the data to a descriptor."""
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127 while data != '':
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128 n = os.write(fd, data)
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129 data = data[n:]
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130
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131 def _read(fd):
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132 """Default read function."""
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133 return os.read(fd, 1024)
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134
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135 def _copy(master_fd, master_read=_read, stdin_read=_read):
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136 """Parent copy loop.
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137 Copies
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138 pty master -> standard output (master_read)
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139 standard input -> pty master (stdin_read)"""
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140 while 1:
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141 rfds, wfds, xfds = select(
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142 [master_fd, STDIN_FILENO], [], [])
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143 if master_fd in rfds:
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144 data = master_read(master_fd)
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145 os.write(STDOUT_FILENO, data)
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146 if STDIN_FILENO in rfds:
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147 data = stdin_read(STDIN_FILENO)
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148 _writen(master_fd, data)
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149
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150 def spawn(argv, master_read=_read, stdin_read=_read):
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151 """Create a spawned process."""
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parents: 13322
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152 if type(argv) == type(''):
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153 argv = (argv,)
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154 pid, master_fd = fork()
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155 if pid == CHILD:
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parents: 13322
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156 apply(os.execlp, (argv[0],) + argv)
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157 try:
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parents: 17978
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158 mode = tty.tcgetattr(STDIN_FILENO)
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159 tty.setraw(STDIN_FILENO)
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160 restore = 1
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parents: 17978
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161 except tty.error: # This is the same as termios.error
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parents: 17978
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162 restore = 0
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parents: 13322
diff changeset
163 try:
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parents: 13322
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164 _copy(master_fd, master_read, stdin_read)
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parents: 17978
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165 except (IOError, OSError):
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parents: 17978
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166 if restore:
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parents: 17978
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167 tty.tcsetattr(STDIN_FILENO, tty.TCSAFLUSH, mode)