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SETNETGRENT(3)             Linux Programmer's Manual            SETNETGRENT(3)



NAME
       setnetgrent, endnetgrent, getnetgrent, getnetgrent_r, innetgr - handle network group entries

SYNOPSIS
       #include <netdb.h>

       int setnetgrent(const char *netgroup);

       void endnetgrent(void);

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

       int getnetgrent_r(char **host, char **user,
                         char **domain, char *buf, int buflen);

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       setnetgrent(), endnetgrent(), getnetgrent(), getnetgrent_r(), innetgr(): _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       The  netgroup  is  a  SunOS  invention.   A  netgroup database is a list of string triples (hostname, username,
       domainname) or other netgroup names.  Any of the elements in a triple can be empty, which means  that  anything
       matches.   The  functions  described  here allow access to the netgroup databases.  The file /etc/nsswitch.conf
       defines what database is searched.

       The setnetgrent() call defines the netgroup that will be searched by subsequent getnetgrent() calls.  The  get-
       netgrent()  function  retrieves  the  next  netgroup entry, and returns pointers in host, user, domain.  A NULL
       pointer means that the corresponding entry matches any string.  The pointers are valid only as long as there is
       no  call  to  other  netgroup-related  functions.   To  avoid this problem you can use the GNU function getnet-
       grent_r() that stores the strings in the supplied buffer.  To free all allocated buffers use endnetgrent().

       In most cases you only want to check if the triplet (hostname, username, domainname) is a member of a netgroup.
       The  function  innetgr() can be used for this without calling the above three functions.  Again, a NULL pointer
       is a wildcard and matches any string.  The function is thread-safe.

RETURN VALUE
       These functions return 1 on success and 0 for failure.

FILES
       /etc/netgroup
       /etc/nsswitch.conf

CONFORMING TO
       These functions are not in POSIX.1-2001, but setnetgrent(), endnetgrent(),  getnetgrent(),  and  innetgr()  are
       available on most Unix systems.  getnetgrent_r() is not widely available on other systems.

NOTES
       In the BSD implementation, setnetgrent() returns void.

SEE ALSO
       sethostent(3), setprotoent(3), setservent(3)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2007-07-26                    SETNETGRENT(3)