1FGETGRENT(3)               Linux Programmer's Manual              FGETGRENT(3)
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NAME

6       fgetgrent - get group file entry
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SYNOPSIS

9       #include <stdio.h>
10       #include <sys/types.h>
11       #include <grp.h>
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13       struct group *fgetgrent(FILE *stream);
14
15   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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17       fgetgrent():
18           Since glibc 2.19:
19               _DEFAULT_SOURCE
20           Glibc 2.19 and earlier:
21               _SVID_SOURCE
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DESCRIPTION

24       The  fgetgrent()  function  returns a pointer to a structure containing
25       the group information from the file referred to by stream.   The  first
26       time  it  is  called it returns the first entry; thereafter, it returns
27       successive entries.  The file referred to by stream must have the  same
28       format as /etc/group (see group(5)).
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30       The group structure is defined in <grp.h> as follows:
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32           struct group {
33               char   *gr_name;        /* group name */
34               char   *gr_passwd;      /* group password */
35               gid_t   gr_gid;         /* group ID */
36               char  **gr_mem;         /* NULL-terminated array of pointers
37                                          to names of group members */
38           };
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RETURN VALUE

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

46       ENOMEM Insufficient memory to allocate group structure.
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ATTRIBUTES

49       For   an   explanation   of   the  terms  used  in  this  section,  see
50       attributes(7).
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52       ┌────────────┬───────────────┬──────────────────────────┐
53       │Interface   │ Attribute     │ Value                    │
54       ├────────────┼───────────────┼──────────────────────────┤
55       │fgetgrent() │ Thread safety │ MT-Unsafe race:fgetgrent │
56       └────────────┴───────────────┴──────────────────────────┘

CONFORMING TO

58       SVr4.
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SEE ALSO

61       endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3), getgr‐
62       nam(3), putgrent(3), setgrent(3), group(5)
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COLOPHON

65       This  page  is  part of release 5.02 of the Linux man-pages project.  A
66       description of the project, information about reporting bugs,  and  the
67       latest     version     of     this    page,    can    be    found    at
68       https://www.kernel.org/doc/man-pages/.
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72GNU                               2017-09-15                      FGETGRENT(3)
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