6.1.1 Process Parameters

These functions and data items provide information and operate on the current process and user.

environ

A mapping object representing the string environment. For example, environ['HOME'] is the pathname of your home directory (on some platforms), and is equivalent to getenv("HOME") in C.

If the platform supports the putenv() function, this mapping may be used to modify the environment as well as query the environment. putenv() will be called automatically when the mapping is modified.

If putenv() is not provided, this mapping may be passed to the appropriate process-creation functions to cause child processes to use a modified environment.

chdir(path)
getcwd(): These functions are described in ``Files and Directories'' (section 6.1.4).

ctermid(): Return the filename corresponding to the controlling terminal of the process. Availability: Unix.

getegid(): Return the current process' effective group id. Availability: Unix.

geteuid(): Return the current process' effective user id. Availability: Unix.

getgid(): Return the current process' group id. Availability: Unix.

getgroups(): Return list of supplemental group ids associated with the current process. Availability: Unix.

getlogin(): Return the actual login name for the current process, even if there are multiple login names which map to the same user id. Availability: Unix.

getpgrp(): Return the current process group id. Availability: Unix.

getpid(): Return the current process id. Availability: Unix, Windows.

getppid(): Return the parent's process id. Availability: Unix.

getuid(): Return the current process' user id. Availability: Unix.

getenv(varname[, value]): Return the value of the environment variable varname if it exists, or value if it doesn't. value defaults to None. Availability: most flavors of Unix, Windows.

putenv(varname, value): Set the environment variable named varname to the string value. Such changes to the environment affect subprocesses started with os.system(), popen() or fork() and execv(). Availability: most flavors of Unix, Windows.
When putenv() is supported, assignments to items in os.environ are automatically translated into corresponding calls to putenv(); however, calls to putenv() don't update os.environ, so it is actually preferable to assign to items of os.environ.

setegid(egid): Set the current process's effective group id. Availability: Unix.

seteuid(euid): Set the current process's effective user id. Availability: Unix.

setgid(gid): Set the current process' group id. Availability: Unix.

setpgrp(): Calls the system call setpgrp() or setpgrp(0, 0) depending on which version is implemented (if any). See the Unix manual for the semantics. Availability: Unix.

setpgid(pid, pgrp): Calls the system call setpgid(). See the Unix manual for the semantics. Availability: Unix.

setreuid(ruid, euid): Set the current process's real and effective user ids. Availability: Unix.

setregid(rgid, egid): Set the current process's real and effective group ids. Availability: Unix.

setsid(): Calls the system call setsid(). See the Unix manual for the semantics. Availability: Unix.

setuid(uid): Set the current process' user id. Availability: Unix.

strerror(code): Return the error message corresponding to the error code in code. Availability: Unix, Windows.

umask(mask): Set the current numeric umask and returns the previous umask. Availability: Unix, Windows.

uname(): Return a 5-tuple containing information identifying the current operating system. The tuple contains 5 strings: (sysname, nodename, release, version, machine). Some systems truncate the nodename to 8 characters or to the leading component; a better way to get the hostname is socket.gethostname() or even socket.gethostbyaddr(socket.gethostname()). Availability: recent flavors of Unix.

See About this document... for information on suggesting changes.

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