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endnetgrent (3)
  • endnetgrent (3) ( FreeBSD man: Библиотечные вызовы )
  • >> endnetgrent (3) ( Linux man: Библиотечные вызовы )
  •  

    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 getnetgrent() 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 getnetgrent_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 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    FILES
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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