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fchmodat (2)
  • >> fchmodat (2) ( Linux man: Системные вызовы )
  •  

    NAME

    fchmodat - change permissions of a file relative to a directory file descriptor
     
    

    SYNOPSIS

    #define _ATFILE_SOURCE
    #include <fcntl.h>           /* Definition of AT_* constants */
    #include <sys/stat.h>
    
    int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
    
     

    DESCRIPTION

    The fchmodat() system call operates in exactly the same way as chmod(2), except for the differences described in this manual page.

    If the pathname given in pathname is relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd (rather than relative to the current working directory of the calling process, as is done by chmod(2) for a relative pathname).

    If pathname is relative and dirfd is the special value AT_FDCWD, then pathname is interpreted relative to the current working directory of the calling process (like chmod(2)).

    If pathname is absolute, then dirfd is ignored.

    flags can either be 0, or include the following flag:

    AT_SYMLINK_NOFOLLOW
    If pathname is a symbolic link, do not dereference it: instead operate on the link itself. This flag is not currently implemented.
     

    RETURN VALUE

    On success, fchmodat() returns 0. On error, -1 is returned and errno is set to indicate the error.  

    ERRORS

    The same errors that occur for chmod(2) can also occur for fchmodat(). The following additional errors can occur for fchmodat():
    EBADF
    dirfd is not a valid file descriptor.
    EINVAL
    Invalid flag specified in flags.
    ENOTDIR
    pathname is relative and dirfd is a file descriptor referring to a file other than a directory.
    ENOTSUP
    flags specified AT_SYMLINK_NOFOLLOW, which is not supported.
     

    VERSIONS

    fchmodat() was added to Linux in kernel 2.6.16.  

    CONFORMING TO

    POSIX.1-2008.  

    NOTES

    See openat(2) for an explanation of the need for fchmodat().  

    SEE ALSO

    chmod(2), openat(2), path_resolution(7), symlink(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    VERSIONS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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