fgetgrent(3) - Linux manual page (original) (raw)

fgetgrent(3) Library Functions Manual fgetgrent(3)

NAME top

   fgetgrent - get group file entry

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#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 top

   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)](../man5/group.5.html)).

   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 top

   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](../man3/errno.3.html)_ is set to indicate the error.

ERRORS top

   **ENOMEM** Insufficient memory to allocate _group_ structure.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌─────────────────────┬───────────────┬──────────────────────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├─────────────────────┼───────────────┼──────────────────────────┤
   │ **fgetgrent**()         │ Thread safety │ MT-Unsafe race:fgetgrent │
   └─────────────────────┴───────────────┴──────────────────────────┘

STANDARDS top

   None.

HISTORY top

   SVr4.

SEE ALSO top

   [endgrent(3)](../man3/endgrent.3.html), [fgetgrent_r(3)](../man3/fgetgrent%5Fr.3.html), [fopen(3)](../man3/fopen.3.html), [getgrent(3)](../man3/getgrent.3.html), [getgrgid(3)](../man3/getgrgid.3.html),
   [getgrnam(3)](../man3/getgrnam.3.html), [putgrent(3)](../man3/putgrent.3.html), [setgrent(3)](../man3/setgrent.3.html), [group(5)](../man5/group.5.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 fgetgrent(3)

Pages that refer to this page:getgrent(3), getgrent_r(3), getgrnam(3), putgrent(3)