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STAT_FLAGS(3) Library Functions Manual STAT_FLAGS(3)


string_to_flags, flags_to_stringStat flags parsing and printing functions


System Utilities Library (libutil, -lutil)


#include <util.h>

char *
flags_to_string(u_long flags, const char *def);

string_to_flags(char **stringp, u_long *setp, u_long *clrp);


The flags_to_string() and string_to_flags() functions are used by programs such as ls(1), mtree(8), makefs(8), etc., to parse and/or print the st_flags field in the stat(2) structure.

They recognize the following flags:

String Flag Description
arch SF_ARCHIVED file is archived
nodump UF_NODUMP do not dump file
opaque UF_OPAQUE directory is opaque in union filesystems
sappnd SF_APPEND writes to the file may only append
schg SF_IMMUTABLE file cannot be changed; it is immutable
snap SF_SNAPSHOT file is a snapshot inode
uappnd UF_APPEND writes to the file may only append
uchg UF_IMMUTABLE file cannot be changed; it is immutable

The SF_APPEND and SF_IMMUTABLE flags are for the superuser only, whereas UF_APPEND and UF_IMMUTABLE are for the user only.

The flags_to_string() function converts the bits set in the flags argument to a comma-separated string and returns it. If no flags are set, then the def string is returned. The returned string is allocated via malloc(3) and it is the responsibility of the caller to free(3) it.

The string_to_flags() function takes a stringp of space, comma, or tab separated flag names and places their bit value on the setp argument. If the flag name is prefixed by: “no”, then the bit value is placed on the clrp argument.


flags_to_string() returns the symbolic representation of flags, the default string, or NULL if allocation failed.

string_to_flags() returns 0 on success and 1 if it fails to parse the string, setting stringp to point to the first string that it failed to parse.


chflags(2), stat(2)
September 20, 2012 NetBSD 7.0