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Process
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The module for operating (UNIX) processes.
Like Math module, all
methods defined in this module are
module functions.
Notice the Process is not a class for process object, but the
module for methods to operate processes.
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Module Attributes:
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egid
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Returns the current effective group ID of the process.
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egid= gid
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Sets the current effective group ID of the process to gid.
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euid
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Returns the current effective user ID of the process.
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euid= uid
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Sets the current effective user ID of the process to uid.
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gid
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Returns the current real group ID of the process.
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gid= gid
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Sets the current real group ID of the process to gid.
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pid
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Returns the process ID of the process, which is same as the value of
the variable `$$ '.
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ppid
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Returns the process ID of the parent process. Under UN*X, the process
ID will be 1 (the pid of init) after the parent process
terminates.
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uid
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Returns the real user ID of the process.
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uid= uid
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Sets the real user ID of the process to uid.
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Module Functions:
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getpgrp([pid])
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Returns the current process group for the pid, 0 for the
current process. If PID is omitted, returns process group of current
process.
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getpriority(which, who)
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Returns the current priority for a process, a process group, or a
user. (See getpriority(2).) The Process module defines
the constants for which, PRIO_PROCESS,
PRIO_PGRP, PRIO_USER.
kill(signal, pid...)
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Sends signal to the specified pid.
signal must be a string or a integer to specify the
signal to send. If the signal is negative (or - before
the signal name), it kills process groups instead of processes.
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setpgrp(pid, pgrp)
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Sets the current process group for the PID, 0 for the current
process.
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setpriority(which, who, prio)
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Sets the current priority for a process, a process group, or a user.
(See setpriority(2).) The Process module defines
the constants for which, PRIO_PROCESS,
PRIO_PGRP, PRIO_USER.
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setsid()
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Creates a new session, and detaches tty. Returns the session ID of
the new session.
wait
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Waits for a child process to terminate and returns the pid of the
deceased process, or raise Errno::ECHILD if there are no
child processes.
waitpid(pid, flags)
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Waits for a particular child process specified by pid to
terminate and returns the pid of the deceased process, or raise
Errno::ECHILD if there is no such child process.
Returns nil if the process did
not terminated yet in the non-blocking mode. Non-blocking wait is
only available on machines supporting either the
waitpid(2) or wait4(2) system calls.
However, waiting for a particular pid with FLAGS of nil or 0 is implemented
everywhere.
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Constants:
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PRIO_PROCESS
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Specifies process priority for getpriority /setpriority .
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PRIO_PGRP
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Specifies process group priority.
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PRIO_USER
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Specifies user priority.
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WNOHANG
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Means to return immediately if no child has exited.
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WUNTRACED
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Means to also return for children which are stopped,
and whose status has not been reported.
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