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fchownat - change ownership of a file relative to a directory file descriptor
#include <fcntl.h> /* Definition of AT_* constants */ #include <unistd.h> int fchownat(int dirfd, const char *pathname, uid_t owner, gid_t group, int flags); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fchownat(): Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _ATFILE_SOURCE
The fchownat() system call operates in exactly the same way as chown(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 chown(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 chown(2)). If pathname is absolute, then dirfd is ignored. The flags argument is a bit mask created by ORing together 0 or more of the following values; AT_EMPTY_PATH (since Linux 2.6.39) If pathname is an empty string, operate on the file referred to by dirfd (which may have been obtained using the open(2) O_PATH flag). In this case, dirfd can refer to any type of file, not just a directory. AT_SYMLINK_NOFOLLOW If pathname is a symbolic link, do not dereference it: instead operate on the link itself, like lchown(2). (By default, fchownat() dereferences symbolic links, like chown(2).)
On success, fchownat() returns 0. On error, -1 is returned and errno is set to indicate the error.
The same errors that occur for chown(2) can also occur for fchownat(). The following additional errors can occur for fchownat(): 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.
fchownat() was added to Linux in kernel 2.6.16; library support was added to glibc in version 2.4.
POSIX.1-2008. A similar system call exists on Solaris.
See openat(2) for an explanation of the need for fchownat().
chown(2), openat(2), path_resolution(7), symlink(7)
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