1FCHMODAT(2)                Linux Programmer's Manual               FCHMODAT(2)
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NAME

6       fchmodat  -  change  permissions of a file relative to a directory file
7       descriptor
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SYNOPSIS

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

17       The fchmodat()  system  call  operates  in  exactly  the  same  way  as
18       chmod(2), except for the differences described in this manual page.
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20       If  the  pathname given in pathname is relative, then it is interpreted
21       relative to the directory referred to  by  the  file  descriptor  dirfd
22       (rather  than  relative to the current working directory of the calling
23       process, as is done by chmod(2) for a relative pathname).
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25       If pathname is relative and dirfd is the special value  AT_FDCWD,  then
26       pathname  is  interpreted  relative to the current working directory of
27       the calling process (like chmod(2)).
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29       If pathname is absolute, then dirfd is ignored.
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31       flags can either be 0, or include the following flag:
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33       AT_SYMLINK_NOFOLLOW
34              If pathname is a symbolic link, do not dereference  it:  instead
35              operate  on  the link itself.  This flag is not currently imple‐
36              mented.
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RETURN VALUE

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

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

58       fchmodat() was added to Linux in kernel 2.6.16.
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CONFORMING TO

61       POSIX.1-2008.
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NOTES

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

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

70       This  page  is  part of release 3.22 of the Linux man-pages project.  A
71       description of the project, and information about reporting  bugs,  can
72       be found at http://www.kernel.org/doc/man-pages/.
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76Linux                             2008-08-21                       FCHMODAT(2)
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