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       #include <fcntl.h> /* Definition of AT_* constants */
11       #include <sys/stat.h>
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13       int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);
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15   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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17       fchmodat():
18       Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
19       Before glibc 2.10: _ATFILE_SOURCE
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DESCRIPTION

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

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

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

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

66       POSIX.1-2008.
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NOTES

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

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

75       This  page  is  part of release 3.25 of the Linux man-pages project.  A
76       description of the project, and information about reporting  bugs,  can
77       be found at http://www.kernel.org/doc/man-pages/.
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81Linux                             2009-12-13                       FCHMODAT(2)
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