fgetgrent(3)               Library Functions Manual               fgetgrent(3)

NAME
       fgetgrent - get group file entry

LIBRARY
       Standard C library (libc, -lc)

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 error.

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 |
       +---------------------------+---------------+--------------------------+
STANDARDS
       None.

HISTORY
       SVr4.

SEE ALSO
       endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3),
       getgrnam(3), putgrent(3), setgrent(3), group(5)

Linux man-pages 6.7               2023-10-31                      fgetgrent(3)