CHFLAGS(2) BSD Programmer's Manual CHFLAGS(2)NAME
chflags, fchflags - set file flags
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
int
chflags(const char *path, unsigned long flags);
int
fchflags(int fd, unsigned long flags);
DESCRIPTION
The file whose name is given by path or referenced by the descriptor fd
has its flags changed to flags.
The flags specified are formed by or'ing the following values
UF_NODUMP Do not dump the file.
UF_IMMUTABLE The file may not be changed.
UF_APPEND The file may only be appended to.
UF_OPAQUE The directory is opaque when viewed through a union
stack.
SF_IMMUTABLE The file may not be changed.
SF_APPEND The file may only be appended to.
The ``UF_IMMUTABLE'' and ``UF_APPEND'' flags may be set or unset by ei-
ther the owner of a file or the super-user.
The ``SF_IMMUTABLE'' and ``SF_APPEND'' flags may only be set or unset by
the super-user. Attempts by the non-super-user to set the super-user on-
ly flags are silently ignored. These flags may be set at any time, but
normally may only be unset when the system is in single-user mode. (See
init(8) for details.)
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, -1 is
returned and the global variable errno is set to indicate the error.
ERRORSChflags() will fail it:
[ENOTDIR] A component of the path prefix is not a directory.
[EINVAL] The pathname contains a character with the high-order bit
set.
[ENAMETOOLONG]
A component of a pathname exceeded 255 characters, or an
entire path name exceeded 1023 characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the path
prefix.
[ELOOP] Too many symbolic links were encountered in translating the
pathname.
[EPERM] The effective user ID does not match the owner of the file
and the effective user ID is not the super-user.
[EROFS] The named file resides on a read-only file system.
[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.
Fchflags() will fail if:
[EBADF] The descriptor is not valid.
[EINVAL] Fd refers to a socket, not to a file.
[EPERM] The effective user ID does not match the owner of the file
and the effective user ID is not the super-user.
[EROFS] The file resides on a read-only file system.
[EIO] An I/O error occurred while reading from or writing to the
file system.
SEE ALSOchflags(1), init(8), mount_union(8)HISTORY
The chflags and fchflags functions first appeared in 4.4BSD.
BSDI BSD/OS May 2, 1995 2
