| SETMODE(3) | Library Functions Manual | SETMODE(3) |
getmode, setmode
— modify mode bits
Standard C Library (libc, -lc)
#include
<unistd.h>
mode_t
getmode(const
void *set, mode_t
mode);
void *
setmode(const
char *mode_str);
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().
The setmode() function may fail and set
errno for any of the errors specified for the library routine
malloc(3).
The getmode() and
setmode() functions first appeared in
4.4BSD.
| April 28, 1995 | macOS 15.2 |