fchown(2POSIX)

NAME | SYNOPSIS | API RESTRICTIONS | FEATURES | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO | STANDARDS

NAME

chown, fchown- change owner and group of a file

SYNOPSIS

#include <unistd.h>

int chown(const char * path, uid_t owner, gid_t group);
int fchown(int fd, uid_t owner, gid_t group);

API RESTRICTIONS

The function or functions documented here may not be used safely in all application contexts with all APIs provided in the ChorusOS 5.0 product.

See API(5FEA) for details.

FEATURES

MSDOSFS, NFS_CLIENT, UFS

DESCRIPTION

The owner ID and group ID of the file named by path or referenced by fd are changed as specified by the arguments owner and group . The owner of a file may change the group to a group of which he or she is a member, but the change owner capability is restricted to the super-user.

The chown() function clears the set-user-id and set-group-id bits on the file to prevent accidental or mischievous creation of set-user-id and set-group-id programs.

fchown() is particularly useful when used in conjunction with the file locking primitives. See flock(2POSIX) .

RETURN VALUES

Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned, and errno is set to indicate the error.

ERRORS

The chown() function will fail and the file will be unchanged if any of the following are true:

[EACCES]

Search permission is denied for a component of the path prefix.

[EFAULT]

Path points outside the process's allocated address space.

[EIO]

An I/O error occurred while reading from or writing to the file system.

[ELOOP]

Too many symbolic links were encountered when translating the pathname.

[ENAMETOOLONG]

A component of a pathname exceeded 255 characters, or an entire pathname exceeded 1023 characters.

[ENOENT]

The file named does not exist.

[ENOTDIR]

A component of the path prefix is not a directory.

[EPERM]

The effective user ID is not the super-user.

[EROFS]

The file named resides on a read-only file system.

fchown() will fail if:

[EBADF]

fd does not refer to a valid descriptor.

[EINVAL]

fd refers to a socket, not a file.

[EPERM]

The effective user ID is not the super-user.

[EROFS]

The named file resides on a read-only file system.

[EIO]

An I/O error occurred while reading from or writing to the file system.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving
MT-Level	Async-Signal-Safe

SEE ALSO

chmod(2POSIX) , flock(2POSIX)

STANDARDS

The chown function conforms to IEEE Std 1003.1-1988 POSIX . .

ChorusOS 5.0  Last Revised December 2001

NAME | SYNOPSIS | API RESTRICTIONS | FEATURES | DESCRIPTION | RETURN VALUES | ERRORS | ATTRIBUTES | SEE ALSO | STANDARDS