Путеводитель по Руководству Linux

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   fcntl.3p    ( 3 )

файловый контроль (file control)

Возвращаемое значение (Return value)

Upon successful completion, the value returned shall depend on
       cmd as follows:

F_DUPFD A new file descriptor.

F_DUPFD_CLOEXEC A new file descriptor.

F_GETFD Value of flags defined in <fcntl.h>. The return value shall not be negative.

F_SETFD Value other than -1.

F_GETFL Value of file status flags and access modes. The return value is not negative.

F_SETFL Value other than -1.

F_GETLK Value other than -1.

F_SETLK Value other than -1.

F_SETLKW Value other than -1.

F_GETOWN Value of the socket owner process or process group; this will not be -1.

F_SETOWN Value other than -1.

Otherwise, -1 shall be returned and errno set to indicate the error.