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SETMODE(3) Library Functions Manual SETMODE(3)

getmode, setmode — modify mode bits

library “libc”

#include <unistd.h>

mode_t
getmode(const void *set, mode_t mode);

void *
setmode(const char *mode_str);

The () 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 () 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 () is invalid or if memory cannot be allocated for the return value, setmode() returns NULL.

The value returned from () is obtained from () and should be returned to the system with () 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).

chmod(1), stat(2), umask(2), malloc(3)

The getmode() and setmode() functions first appeared in 4.4BSD.

April 28, 1995 DragonFly-5.6.1