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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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FGETGRENT(3) Linux Programmer's Manual FGETGRENT(3)
fgetgrent - get group file entry
#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
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 */
};
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.
ENOMEM Insufficient memory to allocate group structure.
For an explanation of the terms used in this section, see
attributes(7).
┌────────────┬───────────────┬──────────────────────────┐
│Interface │ Attribute │ Value │
├────────────┼───────────────┼──────────────────────────┤
│fgetgrent() │ Thread safety │ MT-Unsafe race:fgetgrent │
└────────────┴───────────────┴──────────────────────────┘
SVr4.
endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3),
getgrnam(3), putgrent(3), setgrent(3), group(5)
This page is part of release 4.15 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 FGETGRENT(3)
Pages that refer to this page: getgrent(3), getgrent_r(3), getgrnam(3), putgrent(3)
Copyright and license for this manual page
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