fgetgrent(3)

1fgetgrent(3)               Library Functions Manual               fgetgrent(3)
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NAME

6       fgetgrent - get group file entry
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <stdio.h>
13       #include <sys/types.h>
14       #include <grp.h>
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16       struct group *fgetgrent(FILE *stream);
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18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20       fgetgrent():
21           Since glibc 2.19:
22               _DEFAULT_SOURCE
23           glibc 2.19 and earlier:
24               _SVID_SOURCE
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DESCRIPTION

27       The  fgetgrent()  function  returns a pointer to a structure containing
28       the group information from the file referred to by stream.   The  first
29       time  it  is  called it returns the first entry; thereafter, it returns
30       successive entries.  The file referred to by stream must have the  same
31       format as /etc/group (see group(5)).
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33       The group structure is defined in <grp.h> as follows:
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35           struct group {
36               char   *gr_name;        /* group name */
37               char   *gr_passwd;      /* group password */
38               gid_t   gr_gid;         /* group ID */
39               char  **gr_mem;         /* NULL-terminated array of pointers
40                                          to names of group members */
41           };
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RETURN VALUE

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

49       ENOMEM Insufficient memory to allocate group structure.
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ATTRIBUTES

52       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
53       tributes(7).
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55       ┌───────────────────────────┬───────────────┬──────────────────────────┐
56       │Interface                  │ Attribute     │ Value                    │
57       ├───────────────────────────┼───────────────┼──────────────────────────┤
58       │fgetgrent()                │ Thread safety │ MT-Unsafe race:fgetgrent │
59       └───────────────────────────┴───────────────┴──────────────────────────┘
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STANDARDS

62       None.
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HISTORY

65       SVr4.
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