NAME
getmode, setmode
— modify mode bits
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include
<unistd.h>
mode_t
getmode(const
void *set, mode_t
mode);
void *
setmode(const
char *mode_str);
DESCRIPTION
The
getmode()
function returns a copy of the file permission bits
mode as altered by the values pointed to by
set. While only the mode bits are altered, other parts
of the file mode may be examined.
The
setmode()
function takes an absolute (octal) or symbolic value, as described in
chmod(1), as
an argument and returns a pointer to mode values to be supplied to
getmode(). Because some of the symbolic values are
relative to the file creation mask, setmode() may
call umask(2). If this occurs, the file creation mask will be restored
before setmode() returns. If the calling program
changes the value of its file creation mask after calling
setmode(), setmode() must be
called again if getmode() is to modify future file
modes correctly.
If the mode passed to
setmode()
is invalid or if memory cannot be allocated for the return value,
setmode() returns NULL.
The value returned from
setmode()
is obtained from
malloc()
and should be returned to the system with
free()
when the program is done with it, generally after a call to
getmode().
ERRORS
The setmode() function may fail and set
errno for any of the errors specified for the library routine
malloc(3).
SEE ALSO
HISTORY
The getmode() and
setmode() functions first appeared in
4.4BSD.