注意:
Please note that some of these constants may not be available on every system.
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POSIX_F_OK
(int)
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Check whether the file exists.
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POSIX_R_OK
(int)
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Check whether the file exists and has read permissions.
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POSIX_W_OK
(int)
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Check whether the file exists and has write permissions.
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POSIX_X_OK
(int)
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Check whether the file exists and has execute permissions.
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