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   open.3p    ( 3 )

открыть файл (open file)

Возвращаемое значение (Return value)

Upon successful completion, these functions shall open the file
       and return a non-negative integer representing the file
       descriptor.  Otherwise, these functions shall return -1 and set
       errno to indicate the error. If -1 is returned, no files shall be
       created or modified.