FCNTL(2)

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FCNTL(2)

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fcntl - ��

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        #include <fcntl.h>

        int fcntl (fildes, cmd, arg)
        int fildes, cmd, arg;

��
�� fcntl �� . �� fildes - �� , �� creat, open, dup, fcntl � pipe.

�� cmd �� , �� :

F_DUPFD

�� :

�� - �� , �� arg.
�� (�� ), �� fildes.
� �� , �� (�� ).
�� (��, �� /��).
�� (�� ).
�� "�� exec" �� "�� exec".

F_GETFD

�� "�� exec" �� fildes. �� , �� , � �� exec �� .

F_SETFD

�� "�� exec" �� fildes �� (0 �� 1) �� arg.

F_GETFL

�� , �� fildes.

F_SETFL

�� , �� fildes, �� arg. �� [��. fcntl(5)].

F_GETLK

�� , �� , �� flock � �� arg. �� . �� , �� flock �� , �� F_UNLCK.

F_SETLK

�� flock, �� arg. [��. fcntl(5)]. �� F_SETLK �� (F_RDLCK) �� (F_WRLCK), � �� (F_UNLCK). �� , �� fcntl �� -1.

F_SETLKW

�� F_SETLK �� , �� , �� .

�� -�� . �� . ��, �� , �� , �� .

�� . �� . ��, �� , �� , �� .

�� flock �� , �� (l_type), �� (l_whence), �� (l_start), �� (l_len), �� (l_sysid), �� (l_pid). �� F_GETLK �� . �� , �� . �� , �� , �� l_len �� 0. �� l_whence � l_start �� 0, �� . �� . �� , �� , �� . �� , �� , ��, �� , �� . �� fork(2).

�� [��. chmod(2)], �� read � write �� .

�� fcntl �� , �� :

[EBADF]: �� fildes �� .
[EINVAL]: �� cmd, �� F_DUPFD, �� arg �� , �� .
[EINVAL]: �� cmd, �� F_GETLK, F_SETLK �� F_SETLKW, �� arg �� , �� arg, ��.
[EACCES]: �� cmd, �� F_SETLK, �� (F_RDLCK) �� , �� , �� (F_WRLCK) �� , �� .
[ENOLCK]: �� cmd, �� F_SETLK �� F_SETLKW, �� .
[EDEADLK]: �� cmd, �� F_SETLKW, �� .
[EFAULT]: �� cmd, �� F_SETLK, �� arg �� .
[EINTR]: �� .
[ENOLINK]: �� fildes �� , �� .

��. ��
close(2), creat(2), dup(2), exec(2), fork(2), open(2), pipe(2), fcntl(5).

��
�� cmd �� :

F_DUPFD �� .
F_GETFD �� (�� ).
F_SETFD ��, �� -1.
F_GETFL �� .
F_SETFL ��, �� -1.
F_GETLK ��, �� -1.
F_SETLK ��, �� -1.
F_SETLKW ��, �� -1.

� �� -1, � �� errno �� .

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�� errno �� EAGAIN �� EACCES � ��, �� , �� .

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Designed by Andrey Novikov
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