Package ganeti :: Package utils :: Module wrapper

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Module wrapper

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Utility functions wrapping other functions.

Functions

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(boolean, str)

TestDelay(duration)
Sleep for a fixed amount of time.

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CloseFdNoError(fd, retries=5)
Close a file descriptor ignoring errors.

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SetCloseOnExecFlag(fd, enable)
Sets or unsets the close-on-exec flag on a file descriptor.

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SetNonblockFlag(fd, enable)
Sets or unsets the O_NONBLOCK flag on on a file descriptor.

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RetryOnSignal(fn, *args, **kwargs)
Calls a function again if it failed due to EINTR.

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bool

IgnoreProcessNotFound(fn, *args, **kwargs)
Ignores ESRCH when calling a process-related function.

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IgnoreSignals(fn, *args, **kwargs)
Tries to call a function ignoring failures due to EINTR.

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GetClosedTempfile(*args, **kwargs)
Creates a temporary file and returns its path.

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bool

IsExecutable(filename)
Checks whether a file exists and is executable.

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ResetTempfileModule(_time=time.time)
Resets the random name generator of the tempfile module.

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Imports: sys, time, socket, errno, tempfile, fcntl, os, select, logging

Function Details

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TestDelay(duration)

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Sleep for a fixed amount of time.

Parameters:

duration (float) - the sleep duration, in seconds

Returns: (boolean, str)

False for negative value, and an accompanying error message; True otherwise (and msg is None)

CloseFdNoError(fd, retries=5)

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Close a file descriptor ignoring errors.

Parameters:

fd (int) - the file descriptor
retries (int) - how many retries to make, in case we get any other error than EBADF

SetCloseOnExecFlag(fd, enable)

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Sets or unsets the close-on-exec flag on a file descriptor.

Parameters:

fd (int) - File descriptor
enable (bool) - Whether to set or unset it.

SetNonblockFlag(fd, enable)

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Sets or unsets the O_NONBLOCK flag on on a file descriptor.

Parameters:

fd (int) - File descriptor
enable (bool) - Whether to set or unset it

IgnoreProcessNotFound(fn, *args, **kwargs)

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Ignores ESRCH when calling a process-related function.

ESRCH is raised when a process is not found.

Returns: bool: Whether process was found

IsExecutable(filename)

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Checks whether a file exists and is executable.

Parameters:

filename (string) - Filename

Returns: bool

ResetTempfileModule(_time=time.time)

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Resets the random name generator of the tempfile module.

This function should be called after os.fork in the child process to ensure it creates a newly seeded random generator. Otherwise it would generate the same random parts as the parent process. If several processes race for the creation of a temporary file, this could lead to one not getting a temporary name.