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GETNETGRENT(3) Library Functions Manual GETNETGRENT(3)

getnetgrent, innetgr, setnetgrent, endnetgrentnetgroup database operations

#include <netgroup.h>

getnetgrent(const char **host, const char **user, const char **domain);

innetgr(const char *netgroup, const char *host, const char *user, const char *domain);

setnetgrent(const char *netgroup);


These functions operate on the netgroup database file /etc/netgroup.db which is described in netgroup(5). If that file does not exist, and the system supports YP, then the netgroup YP databases are used instead. The database defines a set of netgroups, each made up of one or more triples:

(host, user, domain)

that defines a combination of host, user, and domain. Any of the three fields may be specified as “wildcards” that match any string.

The function () sets the three pointer arguments to the strings of the next member of the current netgroup. If any of the string pointers are NULL, those fields are considered wildcards.

The functions () and () set the current netgroup and terminate the current netgroup respectively. If setnetgrent() is called with a different netgroup than the previous call, an implicit endnetgrent() is implied. setnetgrent() also sets the offset to the first member of the netgroup.

The function () searches for a match of all fields within the specified group. If any of the host, user, or domain arguments are NULL, those fields will match any string value in the netgroup member.

The function getnetgrent() returns 0 for “no more netgroup members” or 1 otherwise. The function innetgr() returns 1 for a successful match or 0 otherwise. The functions setnetgrent() and endnetgrent() have no return value.

netgroup database file


The function getnetgrent() returns pointers to dynamically allocated data areas that are free(3)'d when the function endnetgrent() is called.

June 5, 2013 OpenBSD-6.4