fgetgrent(3)

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);
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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 error.
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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 at‐
50       tributes(7).
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52       ┌───────────────────────────┬───────────────┬──────────────────────────┐
53       │Interface                  │ Attribute     │ Value                    │
54       ├───────────────────────────┼───────────────┼──────────────────────────┤
55       │fgetgrent()                │ Thread safety │ MT-Unsafe race:fgetgrent │
56       └───────────────────────────┴───────────────┴──────────────────────────┘
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CONFORMING TO

59       SVr4.
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COLOPHON

66       This  page  is  part of release 5.13 of the Linux man-pages project.  A
67       description of the project, information about reporting bugs,  and  the
68       latest     version     of     this    page,    can    be    found    at
69       https://www.kernel.org/doc/man-pages/.
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73GNU                               2021-03-22                      FGETGRENT(3)