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

NAME

     fgetgrent - get group file entry

SYNOPSIS

     #include <stdio.h>
     #include <sys/types.h>
     #include <grp.h>

     struct group *fgetgrent(FILE *stream);

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

     fgetgrent():
         Since glibc 2.19:
             _DEFAULT_SOURCE
         Glibc 2.19 and earlier:
             _SVID_SOURCE

DESCRIPTION

     The  fgetgrent()  function  returns a pointer to a structure containing
     the group information from the file referred to by stream.   The  first
     time  it  is  called it returns the first entry; thereafter, it returns
     successive entries.  The file referred to by stream must have the  same
     format as /etc/group (see group(5)).

     The group structure is defined in <grp.h> as follows:

         struct group {
             char   *gr_name;        /* group name */
             char   *gr_passwd;      /* group password */
             gid_t   gr_gid;         /* group ID */
             char  **gr_mem;         /* NULL-terminated array of pointers
                                        to names of group members */ };

RETURN VALUE

     The  fgetgrent()  function  returns  a pointer to a group structure, or
     NULL if there are no more entries or an error occurs.  In the event  of
     an error, errno is set to indicate the cause.

ERRORS

     ENOMEM Insufficient memory to allocate group structure.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).

     +------------+---------------+--------------------------+
     |Interface   | Attribute     | Value                    |
     +------------+---------------+--------------------------+
     |fgetgrent() | Thread safety | MT-Unsafe race:fgetgrent |
     +------------+---------------+--------------------------+

CONFORMING TO

     SVr4.