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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.
SEE ALSO
       endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3), getgr-
       nam(3), putgrent(3), setgrent(3), group(5)
COLOPHON
       This  page  is  part of release 4.15 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.
GNU                               2017-09-15                      FGETGRENT(3)