HP-UX Reference (11i v2 07/12) - 3 Library Functions N-Z (vol 7)

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userdb_read(3) userdb_read(3)
NAME
userdb_read(), userdb_write(), userdb_delete() - read, write or delete information in the user database,
/var/adm/userdb
SYNOPSIS
#include <prot.h>
int userdb_read(const char *name, const char * const attr[],
char * const value[]);
int userdb_write(const char *name, const char * const attr[],
const char * const value[]);
int userdb_delete(const char *name);
DESCRIPTION
These functions read, write, or delete information in the user database,
/var/adm/userdb
, which is
described in userdb(4).
For element i of the two arrays,
attr[i] is a pointer to the name of an attribute, and value[
i]isapointer
to its value represented as text. The arrays
attr and value are terminated by a null character.
userdb_read() reads the values of the attributes specified in the
attr array from the user database
into the corresponding
value array. If an attribute is not present, a null string is copied into the
value
array. Each element (except for the terminating null) of the value array is a pointer to a buffer. The size
of each buffer is assumed to be at least USERDB_MAX_ATTR_SIZE
bytes, which is defined in
<prot.h>.
userdb_write() writes the values of the attributes specified in the
attr array from the corresponding
value array into the database. For each null string in the value array, the corresponding attribute is
deleted; the system-wide default described in
/etc/default/security
will then apply; see secu-
rity(4). Attribute values are allowed to contain only printable ASCII characters (hex 20-7e).
The tab character (hex 09) may also be used for the following special cases for
value
:
\t+num
\t-num Add or subtract num to or from the current attribute value. Both num and the current
value are assumed to be a string of at most nine ASCII decimal digits. The current value
may also have an optional sign, and is assumed to have a value of 0 if the attribute is not
defined.
\t No operation (do not modify the attribute).
userdb_delete() deletes a user entry from the database. The user entry contains all of the
configurable and internal attributes for a user.
RETURN VALUE
0 success
1 invalid user
2 invalid argument
3 insufficient permission to access the user database
4 file system error
5 invalid attribute
6 invalid attribute value
7 block overflow
8 entry overflow
9 database lock failure
10 database is disabled; see userdb(4)
EXAMPLES
The following program segment writes values for two attributes into the user database for user joe, and
then deletes a third attribute. It then reads and prints two attributes plus the attribute which it removed.
Finally, it removes all of the attributes for user amy.
#include <prot.h>
char p1[USERDB_MAX_ATTR_SIZE];
char p2[USERDB_MAX_ATTR_SIZE];
char p3[USERDB_MAX_ATTR_SIZE];
578 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: December 2007 Update