Fgetgrent (3) Linux Manual Page

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 cause.

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.

Colophon

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fgetgrent (3) Linux Manual Page