usr/share/man/cat3/getgrnam.0

GETGRENT(3)                 BSD Programmer's Manual                GETGRENT(3)

N\bNA\bAM\bME\bE
     g\bge\bet\btg\bgr\bre\ben\bnt\bt, g\bge\bet\btg\bgr\brn\bna\bam\bm, g\bge\bet\btg\bgr\brg\bgi\bid\bd, s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt, s\bse\bet\btg\bgr\bre\ben\bnt\bt, e\ben\bnd\bdg\bgr\bre\ben\bnt\bt - group
     database operations

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     #\b#i\bin\bnc\bcl\blu\bud\bde\be <\b<g\bgr\brp\bp.\b.h\bh>\b>

     _\bs_\bt_\br_\bu_\bc_\bt _\bg_\br_\bo_\bu_\bp _\b*
     g\bge\bet\btg\bgr\bre\ben\bnt\bt(_\bv_\bo_\bi_\bd);

     _\bs_\bt_\br_\bu_\bc_\bt _\bg_\br_\bo_\bu_\bp _\b*
     g\bge\bet\btg\bgr\brn\bna\bam\bm(_\bc_\bo_\bn_\bs_\bt _\bc_\bh_\ba_\br _\b*_\bn_\ba_\bm_\be);

     _\bs_\bt_\br_\bu_\bc_\bt _\bg_\br_\bo_\bu_\bp _\b*
     g\bge\bet\btg\bgr\brg\bgi\bid\bd(_\bg_\bi_\bd_\b__\bt _\bg_\bi_\bd);

     _\bs_\bt_\br_\bu_\bc_\bt _\bg_\br_\bo_\bu_\bp _\b*
     s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt(_\bi_\bn_\bt _\bs_\bt_\ba_\by_\bo_\bp_\be_\bn);

     _\bi_\bn_\bt
     s\bse\bet\btg\bgr\bre\ben\bnt\bt(_\bv_\bo_\bi_\bd);

     _\bv_\bo_\bi_\bd
     e\ben\bnd\bdg\bgr\bre\ben\bnt\bt(_\bv_\bo_\bi_\bd);

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     These functions operate on the group database file _\b/_\be_\bt_\bc_\b/_\bg_\br_\bo_\bu_\bp which is
     described in group(5).  Each line of the database is defined by the
     structure _\bg_\br_\bo_\bu_\bp found in the include file <_\bg_\br_\bp_\b._\bh>:

           struct group {
                   char    *gr_name;       /* group name */
                   char    *gr_passwd;     /* group password */
                   gid_t   gr_gid;         /* group id */
                   char    **gr_mem;       /* group members */
           };

     The functions g\bge\bet\btg\bgr\brn\bna\bam\bm() and g\bge\bet\btg\bgr\brg\bgi\bid\bd() search the group database for the
     given group name pointed to by _\bn_\ba_\bm_\be or the group id pointed to by _\bg_\bi_\bd,
     respectively, returning the first one encountered.  Identical group names
     or group gids may result in undefined behavior.

     The g\bge\bet\btg\bgr\bre\ben\bnt\bt() function sequentially reads the group database and is in-
     tended for programs that wish to step through the complete list of
     groups.

     All three routines will open the group file for reading, if necesssary.

     The s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt() function opens the file, or rewinds it if it is already
     open.  If _\bs_\bt_\ba_\by_\bo_\bp_\be_\bn is non-zero, file descriptors are left open, signifi-
     cantly speeding functions subsequent calls.  This functionality is unnec-
     essary for g\bge\bet\btg\bgr\bre\ben\bnt\bt() as it doesn't close its file descriptors by de-
     fault.  It should also be noted that it is dangerous for long-running
     programs to use this functionality as the group file may be updated.

     The s\bse\bet\btg\bgr\bre\ben\bnt\bt() function is identical to s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt() with an argument of
     zero.

     The e\ben\bnd\bdg\bgr\bre\ben\bnt\bt() function closes any open files.

R\bRE\bET\bTU\bUR\bRN\bN V\bVA\bAL\bLU\bUE\bES\bS
     The functions g\bge\bet\btg\bgr\bre\ben\bnt\bt(), g\bge\bet\btg\bgr\brn\bna\bam\bm(), and g\bge\bet\btg\bgr\brg\bgi\bid\bd(), return a pointer to
     the group entry if successful; if end-of-file is reached or an error oc-
     curs a null pointer is returned.  The functions s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt() and
     s\bse\bet\btg\bgr\bre\ben\bnt\bt() return the value 1 if successful, otherwise the value 0 is re-
     turned.  The functions e\ben\bnd\bdg\bgr\bre\ben\bnt\bt() and s\bse\bet\btg\bgr\brf\bfi\bil\ble\be() have no return value.

F\bFI\bIL\bLE\bES\bS
     /etc/group  group database file

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
     g\bge\bet\btp\bpw\bwe\ben\bnt\bt(_\b3), g\bgr\bro\bou\bup\bp(_\b5)

H\bHI\bIS\bST\bTO\bOR\bRY\bY
     The functions e\ben\bnd\bdg\bgr\bre\ben\bnt\bt(), g\bge\bet\btg\bgr\bre\ben\bnt\bt(), g\bge\bet\btg\bgr\brn\bna\bam\bm(), g\bge\bet\btg\bgr\brg\bgi\bid\bd(), and
     s\bse\bet\btg\bgr\bre\ben\bnt\bt() appeared in Version 7 AT&T UNIX.  The functions s\bse\bet\btg\bgr\brf\bfi\bil\ble\be()
     and s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt() appeared in 4.3BSD-Reno.

C\bCO\bOM\bMP\bPA\bAT\bTI\bIB\bBI\bIL\bLI\bIT\bTY\bY
     The historic function s\bse\bet\btg\bgr\brf\bfi\bil\ble\be(), which allowed the specification of al-
     ternate password databases, has been deprecated and is no longer avail-
     able.

B\bBU\bUG\bGS\bS
     The functions g\bge\bet\btg\bgr\bre\ben\bnt\bt(), g\bge\bet\btg\bgr\brn\bna\bam\bm(), g\bge\bet\btg\bgr\brg\bgi\bid\bd(), s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt() and
     s\bse\bet\btg\bgr\bre\ben\bnt\bt() leave their results in an internal static object and return a
     pointer to that object. Subsequent calls to the same function will modify
     the same object.

     The functions g\bge\bet\btg\bgr\bre\ben\bnt\bt(), e\ben\bnd\bdg\bgr\bre\ben\bnt\bt(), s\bse\bet\btg\bgr\bro\bou\bup\bpe\ben\bnt\bt(), and s\bse\bet\btg\bgr\bre\ben\bnt\bt() are
     fairly useless in a networked environment and should be avoided, if pos-
     sible.

4.4BSD                           June 4, 1993                                2