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class methods
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egid
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Process.egid
-> aFixnum
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Returns the effective group id for this process.
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egid=
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Process.egid= aFixnum
-> aFixnum
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Sets the effective group id for this process.
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euid
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Process.euid
-> aFixnum
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Returns the effective user id for this process.
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euid=
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Process.euid= aFixnum
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Sets the effective user id for this process.
Not available on all platforms.
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exit!
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Process.exit!( aFixnum=-1 )
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Exits the process immediately.
No exit handlers are run.
aFixnum is returned to the underlying system as the exit
status.
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fork
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Process.fork [{ block }
]
-> aFixnum or nil
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See
Kernel::fork
on page 416.
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getpgid
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Process.getpgid( anInteger )
-> anInteger
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Returns the process group id for the given process id.
Not available on all platforms.
Process.getpgid(Process.ppid())
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� |
32438
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getpgrp
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Process.getpgrp
-> anInteger
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Returns the process group id for this process.
Not available on all platforms.
Process.getpgid(0)
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� |
32438
|
Process.getpgrp
|
� |
32438
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getpriority
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Process.getpriority( aKind,
anInteger ) -> aFixnum
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Gets the
scheduling priority for specified process, process group, or
user. aKind indicates the kind of entity to find:
one of
Process::PRIO_PGRP
,
Process::PRIO_USER
, or
Process::PRIO_PROCESS
.
anInteger is an id indicating the particular process,
process group, or user (an id of 0 means current).
Lower priorities are more favorable for
scheduling. Not available on all platforms.
Process.getpriority(Process::PRIO_USER, 0)
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� |
0
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Process.getpriority(Process::PRIO_PROCESS, 0)
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� |
0
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gid
|
Process.gid
-> aFixnum
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Returns the group id for this process.
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gid=
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Process.gid= aFixnum
-> aFixnum
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Sets the group id for this process.
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kill
|
Process.kill( aSignal,
[
aPid
]+
) -> aFixnum
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Sends the given signal to the specified process id(s),
or to the
current process if aPid is zero. aSignal may be an
integer signal number or a POSIX signal name (either with or
without a SIG prefix). If aSignal is negative (or
starts with a ``-'' sign), kills process groups instead
of processes. Not all signals are available on all platforms.
trap("SIGHUP") { close_then_exit }
Process.kill("SIGHUP", 0)
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pid
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Process.pid -> aFixnum
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Returns the process id of this process.
Not available on all platforms.
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ppid
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Process.ppid -> aFixnum
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Returns the process id of the parent of this process.
Always returns 0 on NT.
Not available on all platforms.
print "I am ", Process.pid, "\n"
Process.fork { print "Dad is ", Process.ppid, "\n" }
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produces:
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setpgid
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Process.setpgid( aPid, anInteger )
-> 0
|
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Sets the process group id of aPid (0 indicates this
process) to anInteger.
Not available on all platforms.
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setpgrp
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Process.setpgrp
-> 0
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Equivalent to setpgid(0,0).
Not available on all platforms.
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setpriority
|
Process.setpriority( kind,
anInteger, anIntPriority )
-> 0
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See
Process#getpriority
.
Process.setpriority(Process::PRIO_USER, 0, 19)
|
� |
0
|
Process.setpriority(Process::PRIO_PROCESS, 0, 19)
|
� |
0
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Process.getpriority(Process::PRIO_USER, 0)
|
� |
19
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Process.getpriority(Process::PRIO_PROCESS, 0)
|
� |
19
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setsid
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Process.setsid
-> aFixnum
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Establishes this process as a new session and process group
leader, with no controlling tty.
Returns the session id.
Not available on all platforms.
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uid
|
Process.uid
-> aFixnum
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Returns the user id of this process.
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uid=
|
Process.uid= anInteger
-> aNumeric
|
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Sets the (integer) user id for this process.
Not available on all platforms.
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wait
|
Process.wait
-> aFixnum
|
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Waits for any child process to exit and returns the process id
of that child.
Raises a SystemError if there are no child processes.
Not available on all platforms.
Process.fork { exit 1; }
|
� |
1500
|
Process.wait
|
� |
1500
|
|
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wait2
|
Process.wait2
-> anArray
|
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Waits for any child process to exit and returns an array
containing the process id and the exit status
of that child.
Raises a SystemError if there are no child processes.
Process.fork { exit 1 }
|
� |
1503
|
Process.wait2
|
� |
[1503, 256]
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waitpid
|
Process.waitpid( aPid,
anInteger=0 )
-> aPid
|
|
Waits for the given child process to exit. anInteger may be
a logical or of the flag value
Process::WNOHANG
(do not block if no child available)
or
Process::WUNTRACED
(return stopped children that haven't
been reported).
Not all flags are available on all platforms, but a flag value
of zero will work on all platforms.
include Process
|
pid = fork { sleep 3 }
|
� |
1506
|
Time.now
|
� |
Sun Jun 09 00:20:09 CDT 2002
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waitpid(pid, Process::WNOHANG)
|
� |
nil
|
Time.now
|
� |
Sun Jun 09 00:20:09 CDT 2002
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waitpid(pid, 0)
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� |
1506
|
Time.now
|
� |
Sun Jun 09 00:20:12 CDT 2002
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waitpid2
|
Process.waitpid2( aPid,
anInteger=0 )
-> anArray
|
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Waits for the given child process to exit, returning that
child's process id and exit status. anInteger may be
a logical or of the flag value
Process::WNOHANG
(do not block if no child available)
or
Process::WUNTRACED
(return stopped children that haven't
been reported).
Not all flags are available on all platforms, but a flag value
of zero will work on all platforms.
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