svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
chown(2)
chown(2) System Calls chown(2)
NAME
chown, lchown, fchown, fchownat - change owner and group of a file
SYNOPSIS
#include <unistd.h>
#include <sys/types.h>
int chown(const char *path, uid_t owner, gid_t group);
int lchown(const char *path, uid_t owner, gid_t group);
int fchown(int fildes, uid_t owner, gid_t group);
int fchownat(int fildes, const char *path, uid_t owner,
gid_t group, int flag);
DESCRIPTION
The chown() and fchown() functions set the owner ID and group ID of the
file specified by path or referenced by the open file descriptor fildes
to owner and group respectively. If owner or group is specified as −1,
these functions do not change the corresponding ID of the file.
The lchown() function sets the owner ID and group ID of the named file
in the same manner as chown(), unless the named file is a symbolic
link. In this case, lchown() changes the ownership of the symbolic link
file itself, while chown() changes the ownership of the file or direc‐
tory to which the symbolic link refers.
The fchownat() function sets the owner ID and group ID of the named
file in the same manner as chown(). If, however, the path argument is
relative, the path is resolved relative to the fildes argument rather
than the current working directory. If the fildes argument has the spe‐
cial value AT_FDCWD, the path resolution reverts back to current work‐
ing directory relative. If the path argument is absolute, the fildes
argument is ignored. If the path argument is a null pointer, the func‐
tion behaves like fchown().
Values for flag are constructed by a bitwise-inclusive OR of flags from
the following list, defined in <fcntl.h>:
AT_SYMLINK_NOFOLLOW If path names a symbolic link, then ownership of
the symbolic link is changed, as in lchown().
If chown(), lchown(), fchown(), or fchownat() is invoked by a process
that does not have {PRIV_FILE_SETID} asserted in its effective set, the
set-user-ID and set-group-ID bits of the file mode, S_ISUID and S_ISGID
respectively, are cleared (see chmod(2)). Additional restrictions apply
when changing the ownership to uid 0.
The operating system defines several privileges to override restric‐
tions on the chown() family of functions. When the {PRIV_FILE_CHOWN}
privilege is asserted in the effective set of the current process,
there are no restrictions except in the special circumstances of chang‐
ing ownership to or from uid 0. When the {PRIV_FILE_CHOWN_SELF} privi‐
lege is asserted, ownership changes are restricted to the files of
which the ownership matches the effective user ID of the current
process. If neither privilege is asserted in the effective set of the
calling process, ownership changes are limited to changes of the group
of the file to the list of supplementary group IDs and the effective
group ID.
The file system provides mount options rstchown and norstchown to con‐
trol the default chown() behavior of the file system and NFS server. If
rstchown is not in effect, the privilege {PRIV_FILE_CHOWN_SELF} is
implicitly granted to the user when attempting to give away files,
except for files owned by uid 0. The _POSIX_CHOWN_RESTRICTED option
will be reported as true for paths on filesystems mounted with the
rstchown option, when checked with fpathconf(2) or getconf(1).
Upon successful completion, chown(), fchown(), fchownat(), and lchown()
mark for update the st_ctime field of the file.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, −1 is returned,
the owner and group of the named file remain unchanged, and errno is
set to indicate the error.
ERRORS
All of these functions will fail if:
EPERM The effective user ID does not match the owner of the file and
the {PRIV_FILE_CHOWN} privilege is not asserted in the effec‐
tive set of the calling process, or the {PRIV_FILE_CHOWN_SELF}
privilege is not asserted in the effective set of the calling
process.
The chown(), lchown(), and fchownat() functions will fail if:
EACCES Search permission is denied on a component of the path
prefix of path.
EFAULT The path argument points to an illegal address and for
fchownat(), the file descriptor has the value AT_FDCWD.
EINTR A signal was caught during the execution of the chown()
or lchown() function.
EINVAL The group or owner argument is out of range.
EIO An I/O error occurred while reading from or writing to
the file system.
ELOOP Too many symbolic links were encountered in translating
path.
ENAMETOOLONG The length of the path argument exceeds {PATH_MAX}, or
the length of a path component exceeds {NAME_MAX} while
{_POSIX_NO_TRUNC} is in effect.
ENOLINK The path argument points to a remote machine and the
link to that machine is no longer active.
ENOENT Either a component of the path prefix or the file
referred to by path does not exist or is a null path‐
name.
ENOTDIR A component of the path prefix of path is not a direc‐
tory, or the path supplied to fchownat() is relative
and the file descriptor provided does not refer to a
valid directory.
EROFS The named file resides on a read-only file system.
The fchown() and fchownat() functions will fail if:
EBADF For fchown() the fildes argument is not an open file
descriptor and.
For fchownat(), the path argument is not absolute and the
fildes argument is not AT_FDCWD or an open file descriptor.
EIO An I/O error occurred while reading from or writing to the
file system.
EINTR A signal was caught during execution of the function.
ENOLINK The fildes argument points to a remote machine and the link
to that machine is no longer active.
EINVAL The group or owner argument is out of range.
EROFS The named file referred to by fildes resides on a read-only
file system.
USAGE
The ability to specify a null path argument to the fchownat() function
is a Solaris extension not specified by the standards, and may not be
portable to other systems. Use the fchown() function for greater porta‐
bility when changing the ownership of an open file descriptor.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSee below. _
StandardSee below.
The chown() and fchownat() functions are Async-Signal-Safe.
See standards(7) for descriptions of the following standards:
tab() box; cw(2.2i) |cw(3.3i) lw(2.2i) |lw(3.3i) INTERFACESAPPLICABLE
STANDARDS _
chown()
T{
POSIX.1-1990 through 2008,
SUS through SUSv4,
XPG1 through XPG7
T} _ T{
fchown()
lchown()
T}T{
POSIX.1-2001 through 2008,
SUS through SUSv4,
XPG4v2 through XPG7
T} _
fchownat()
T{
POSIX.1-2008,
SUSv4,
XPG7
T}
SEE ALSO
chgrp(1), chown(1), getconf(1), chmod(2), fpathconf(2), system(5),
attributes(7), privileges(7), standards(7)
HISTORY
The chown(), fchown(), and lchown() functions have been included in all
Sun and Oracle releases of Solaris.
The fchownat() function was added to Solaris in the Solaris 9 release.
Oracle Solaris 11.4 3 Nov 2021 chown(2)