fgetgrent

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 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 │
       └─────────────────────────────┴───────────────┴──────────────────────────┘

CONFORMING TO
       SVr4.

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

COLOPHON
       This page is part of release 5.13 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                                2021-03-22                       FGETGRENT(3)