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annotate Doc/lib/libsubprocess.tex @ 34161:ca2ca1aeb080 2.4

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author Johannes Gijsbers <jlg@dds.nl>
date Mon, 13 Dec 2004 13:11:42 +0000
parents 8cecb8dc43a3
children 73b09c2b788b 60830ad6275e
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1 \section{\module{subprocess} --- Subprocess management}
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2
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3 \declaremodule{standard}{subprocess}
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4 \modulesynopsis{Subprocess management.}
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5 \moduleauthor{Peter \AA strand}{astrand@lysator.liu.se}
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6 \sectionauthor{Peter \AA strand}{astrand@lysator.liu.se}
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7
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8 \versionadded{2.4}
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9
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10 The \module{subprocess} module allows you to spawn new processes,
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11 connect to their input/output/error pipes, and obtain their return
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12 codes. This module intends to replace several other, older modules
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13 and functions, such as:
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14
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15 % XXX Should add pointers to this module to at least the popen2
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16 % and commands sections.
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17
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18 \begin{verbatim}
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19 os.system
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20 os.spawn*
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21 os.popen*
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22 popen2.*
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23 commands.*
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24 \end{verbatim}
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25
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26 Information about how the \module{subprocess} module can be used to
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27 replace these modules and functions can be found in the following
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28 sections.
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29
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30 \subsection{Using the subprocess Module}
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31
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32 This module defines one class called \class{Popen}:
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33
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34 \begin{classdesc}{Popen}{args, bufsize=0, executable=None,
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35 stdin=None, stdout=None, stderr=None,
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36 preexec_fn=None, close_fds=False, shell=False,
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37 cwd=None, env=None, universal_newlines=False,
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38 startupinfo=None, creationflags=0}
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39
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40 Arguments are:
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41
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42 \var{args} should be a string, or a sequence of program arguments. The
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43 program to execute is normally the first item in the args sequence or
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44 string, but can be explicitly set by using the executable argument.
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45
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46 On \UNIX{}, with \var{shell=False} (default): In this case, the Popen
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47 class uses \method{os.execvp()} to execute the child program.
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48 \var{args} should normally be a sequence. A string will be treated as a
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49 sequence with the string as the only item (the program to execute).
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50
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51 On \UNIX{}, with \var{shell=True}: If args is a string, it specifies the
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52 command string to execute through the shell. If \var{args} is a
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53 sequence, the first item specifies the command string, and any
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54 additional items will be treated as additional shell arguments.
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55
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56 On Windows: the \class{Popen} class uses CreateProcess() to execute
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57 the child program, which operates on strings. If \var{args} is a
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58 sequence, it will be converted to a string using the
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59 \method{list2cmdline} method. Please note that not all MS Windows
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60 applications interpret the command line the same way:
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61 \method{list2cmdline} is designed for applications using the same
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62 rules as the MS C runtime.
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63
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64 \var{bufsize}, if given, has the same meaning as the corresponding
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65 argument to the built-in open() function: \constant{0} means unbuffered,
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66 \constant{1} means line buffered, any other positive value means use a
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67 buffer of (approximately) that size. A negative \var{bufsize} means to
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68 use the system default, which usually means fully buffered. The default
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69 value for \var{bufsize} is \constant{0} (unbuffered).
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70
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71 The \var{executable} argument specifies the program to execute. It is
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72 very seldom needed: Usually, the program to execute is defined by the
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73 \var{args} argument. If \var{shell=True}, the \var{executable}
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74 argument specifies which shell to use. On \UNIX{}, the default shell
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75 is /bin/sh. On Windows, the default shell is specified by the COMSPEC
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76 environment variable.
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77
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78 \var{stdin}, \var{stdout} and \var{stderr} specify the executed
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79 programs' standard input, standard output and standard error file
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80 handles, respectively. Valid values are \code{PIPE}, an existing file
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81 descriptor (a positive integer), an existing file object, and
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82 \code{None}. \code{PIPE} indicates that a new pipe to the child
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83 should be created. With \code{None}, no redirection will occur; the
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84 child's file handles will be inherited from the parent. Additionally,
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85 \var{stderr} can be \code{STDOUT}, which indicates that the stderr
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86 data from the applications should be captured into the same file
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87 handle as for stdout.
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88
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89 If \var{preexec_fn} is set to a callable object, this object will be
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90 called in the child process just before the child is executed.
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91
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92 If \var{close_fds} is true, all file descriptors except \constant{0},
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93 \constant{1} and \constant{2} will be closed before the child process is
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94 executed.
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95
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96 If \var{shell} is \constant{True}, the specified command will be
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97 executed through the shell.
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98
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99 If \var{cwd} is not \code{None}, the current directory will be changed
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100 to cwd before the child is executed.
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101
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102 If \var{env} is not \code{None}, it defines the environment variables
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103 for the new process.
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104
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105 If \var{universal_newlines} is \constant{True}, the file objects stdout
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106 and stderr are opened as a text files, but lines may be terminated by
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107 any of \code{'\e n'}, the Unix end-of-line convention, \code{'\e r'},
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108 the Macintosh convention or \code{'\e r\e n'}, the Windows convention.
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109 All of these external representations are seen as \code{'\e n'} by the
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110 Python program. \note{This feature is only available if Python is built
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111 with universal newline support (the default). Also, the newlines
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112 attribute of the file objects \member{stdout}, \member{stdin} and
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113 \member{stderr} are not updated by the communicate() method.}
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114
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115 The \var{startupinfo} and \var{creationflags}, if given, will be
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116 passed to the underlying CreateProcess() function. They can specify
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117 things such as appearance of the main window and priority for the new
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118 process. (Windows only)
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119 \end{classdesc}
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120
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121 \subsubsection{Convenience Functions}
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122
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123 This module also defines one shortcut function:
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124
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125 \begin{funcdesc}{call}{*args, **kwargs}
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126 Run command with arguments. Wait for command to complete, then
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127 return the \member{returncode} attribute.
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128
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129 The arguments are the same as for the Popen constructor. Example:
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130
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131 \begin{verbatim}
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132 retcode = call(["ls", "-l"])
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133 \end{verbatim}
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134 \end{funcdesc}
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135
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136
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137 \subsubsection{Exceptions}
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138
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139 Exceptions raised in the child process, before the new program has
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140 started to execute, will be re-raised in the parent. Additionally,
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141 the exception object will have one extra attribute called
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142 \member{child_traceback}, which is a string containing traceback
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143 information from the childs point of view.
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144
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145 The most common exception raised is \exception{OSError}. This occurs,
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146 for example, when trying to execute a non-existent file. Applications
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147 should prepare for \exception{OSError} exceptions.
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148
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149 A \exception{ValueError} will be raised if \class{Popen} is called
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150 with invalid arguments.
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151
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152
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153 \subsubsection{Security}
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154
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155 Unlike some other popen functions, this implementation will never call
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156 /bin/sh implicitly. This means that all characters, including shell
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157 metacharacters, can safely be passed to child processes.
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158
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159
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160 \subsection{Popen Objects}
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161
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162 Instances of the \class{Popen} class have the following methods:
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163
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164 \begin{methoddesc}{poll}{}
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165 Check if child process has terminated. Returns returncode
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166 attribute.
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167 \end{methoddesc}
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168
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169 \begin{methoddesc}{wait}{}
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170 Wait for child process to terminate. Returns returncode attribute.
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171 \end{methoddesc}
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172
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173 \begin{methoddesc}{communicate}{input=None}
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174 Interact with process: Send data to stdin. Read data from stdout and
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175 stderr, until end-of-file is reached. Wait for process to terminate.
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176 The optional \var{stdin} argument should be a string to be sent to the
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177 child process, or \code{None}, if no data should be sent to the child.
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178
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179 communicate() returns a tuple (stdout, stderr).
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180
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181 \note{The data read is buffered in memory, so do not use this method
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182 if the data size is large or unlimited.}
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183 \end{methoddesc}
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184
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185 The following attributes are also available:
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186
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187 \begin{memberdesc}{stdin}
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188 If the \var{stdin} argument is \code{PIPE}, this attribute is a file
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189 object that provides input to the child process. Otherwise, it is
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190 \code{None}.
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191 \end{memberdesc}
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192
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193 \begin{memberdesc}{stdout}
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194 If the \var{stdout} argument is \code{PIPE}, this attribute is a file
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195 object that provides output from the child process. Otherwise, it is
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196 \code{None}.
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197 \end{memberdesc}
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198
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199 \begin{memberdesc}{stderr}
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200 If the \var{stderr} argument is \code{PIPE}, this attribute is file
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201 object that provides error output from the child process. Otherwise,
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202 it is \code{None}.
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203 \end{memberdesc}
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204
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205 \begin{memberdesc}{pid}
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206 The process ID of the child process.
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207 \end{memberdesc}
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208
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209 \begin{memberdesc}{returncode}
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210 The child return code. A \code{None} value indicates that the process
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211 hasn't terminated yet. A negative value -N indicates that the child
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212 was terminated by signal N (\UNIX{} only).
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213 \end{memberdesc}
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214
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215
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216 \subsection{Replacing Older Functions with the subprocess Module}
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217
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218 In this section, "a ==> b" means that b can be used as a replacement
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219 for a.
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220
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221 \note{All functions in this section fail (more or less) silently if
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222 the executed program cannot be found; this module raises an
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223 \exception{OSError} exception.}
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224
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225 In the following examples, we assume that the subprocess module is
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226 imported with "from subprocess import *".
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227
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228 \subsubsection{Replacing /bin/sh shell backquote}
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229
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230 \begin{verbatim}
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231 output=`mycmd myarg`
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232 ==>
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233 output = Popen(["mycmd", "myarg"], stdout=PIPE).communicate()[0]
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234 \end{verbatim}
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235
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236 \subsubsection{Replacing shell pipe line}
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237
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238 \begin{verbatim}
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239 output=`dmesg | grep hda`
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240 ==>
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241 p1 = Popen(["dmesg"], stdout=PIPE)
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8cecb8dc43a3 Corrected example for replacing shell pipeline. Fixes bug 1073790.
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242 p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
33774
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243 output = p2.communicate()[0]
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244 \end{verbatim}
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245
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246 \subsubsection{Replacing os.system()}
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247
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248 \begin{verbatim}
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249 sts = os.system("mycmd" + " myarg")
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250 ==>
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251 p = Popen("mycmd" + " myarg", shell=True)
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252 sts = os.waitpid(p.pid, 0)
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253 \end{verbatim}
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254
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255 Notes:
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256
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257 \begin{itemize}
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258 \item Calling the program through the shell is usually not required.
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259 \item It's easier to look at the \member{returncode} attribute than
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260 the exit status.
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261 \end{itemize}
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262
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263 A more realistic example would look like this:
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264
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265 \begin{verbatim}
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266 try:
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267 retcode = call("mycmd" + " myarg", shell=True)
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268 if retcode < 0:
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269 print >>sys.stderr, "Child was terminated by signal", -retcode
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270 else:
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271 print >>sys.stderr, "Child returned", retcode
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272 except OSError, e:
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273 print >>sys.stderr, "Execution failed:", e
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274 \end{verbatim}
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275
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276 \subsubsection{Replacing os.spawn*}
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277
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278 P_NOWAIT example:
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279
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280 \begin{verbatim}
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281 pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
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282 ==>
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283 pid = Popen(["/bin/mycmd", "myarg"]).pid
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284 \end{verbatim}
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285
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286 P_WAIT example:
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287
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288 \begin{verbatim}
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289 retcode = os.spawnlp(os.P_WAIT, "/bin/mycmd", "mycmd", "myarg")
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290 ==>
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291 retcode = call(["/bin/mycmd", "myarg"])
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292 \end{verbatim}
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293
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294 Vector example:
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295
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296 \begin{verbatim}
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297 os.spawnvp(os.P_NOWAIT, path, args)
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298 ==>
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299 Popen([path] + args[1:])
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300 \end{verbatim}
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301
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302 Environment example:
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303
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304 \begin{verbatim}
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305 os.spawnlpe(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg", env)
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306 ==>
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307 Popen(["/bin/mycmd", "myarg"], env={"PATH": "/usr/bin"})
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308 \end{verbatim}
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309
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310 \subsubsection{Replacing os.popen*}
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311
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312 \begin{verbatim}
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313 pipe = os.popen(cmd, mode='r', bufsize)
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314 ==>
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315 pipe = Popen(cmd, shell=True, bufsize=bufsize, stdout=PIPE).stdout
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316 \end{verbatim}
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317
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318 \begin{verbatim}
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319 pipe = os.popen(cmd, mode='w', bufsize)
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320 ==>
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321 pipe = Popen(cmd, shell=True, bufsize=bufsize, stdin=PIPE).stdin
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322 \end{verbatim}
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323
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324 \begin{verbatim}
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325 (child_stdin, child_stdout) = os.popen2(cmd, mode, bufsize)
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326 ==>
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327 p = Popen(cmd, shell=True, bufsize=bufsize,
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328 stdin=PIPE, stdout=PIPE, close_fds=True)
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329 (child_stdin, child_stdout) = (p.stdin, p.stdout)
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330 \end{verbatim}
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331
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332 \begin{verbatim}
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333 (child_stdin,
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334 child_stdout,
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335 child_stderr) = os.popen3(cmd, mode, bufsize)
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336 ==>
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337 p = Popen(cmd, shell=True, bufsize=bufsize,
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338 stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)
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339 (child_stdin,
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340 child_stdout,
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341 child_stderr) = (p.stdin, p.stdout, p.stderr)
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342 \end{verbatim}
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343
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344 \begin{verbatim}
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345 (child_stdin, child_stdout_and_stderr) = os.popen4(cmd, mode, bufsize)
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346 ==>
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347 p = Popen(cmd, shell=True, bufsize=bufsize,
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348 stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)
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349 (child_stdin, child_stdout_and_stderr) = (p.stdin, p.stdout)
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350 \end{verbatim}
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351
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352 \subsubsection{Replacing popen2.*}
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353
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354 \note{If the cmd argument to popen2 functions is a string, the command
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355 is executed through /bin/sh. If it is a list, the command is directly
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356 executed.}
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357
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358 \begin{verbatim}
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359 (child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
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360 ==>
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361 p = Popen(["somestring"], shell=True, bufsize=bufsize
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362 stdin=PIPE, stdout=PIPE, close_fds=True)
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363 (child_stdout, child_stdin) = (p.stdout, p.stdin)
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364 \end{verbatim}
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365
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366 \begin{verbatim}
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367 (child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize, mode)
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368 ==>
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369 p = Popen(["mycmd", "myarg"], bufsize=bufsize,
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370 stdin=PIPE, stdout=PIPE, close_fds=True)
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371 (child_stdout, child_stdin) = (p.stdout, p.stdin)
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372 \end{verbatim}
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373
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374 The popen2.Popen3 and popen3.Popen4 basically works as subprocess.Popen,
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375 except that:
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376
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377 \begin{itemize}
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378 \item subprocess.Popen raises an exception if the execution fails
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379
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380 \item the \var{capturestderr} argument is replaced with the \var{stderr}
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381 argument.
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382
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383 \item stdin=PIPE and stdout=PIPE must be specified.
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384
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385 \item popen2 closes all file descriptors by default, but you have to
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386 specify close_fds=True with subprocess.Popen.
fbacbb262789 SF Patch #1048341: subprocess documentation, based on PEP/docstring by
Fredrik Lundh <fredrik@pythonware.com>
parents:
diff changeset
387 \end{itemize}