2.9BSD/usr/man/man3/getgrent.3

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.TH GETGRENT 3
.SH NAME
getgrent, getgrgid, getgrnam, setgrent, endgrent \- get group file entry
.SH SYNOPSIS
.B #include <grp.h>
.PP
.B struct group *getgrent();
.PP
.B struct group *getgrgid(gid) int gid;
.PP
.B struct group *getgrnam(name) char *name;
.PP
.B int setgrent();
.PP
.B int endgrent();
.SH DESCRIPTION
.I Getgrent,
.I getgrgid
and
.I getgrnam
each return pointers
to an object
with the following structure
containing the broken-out
fields of a line in the group file.
.RS
.PP
.nf
struct	group { /* see getgrent(3) */
	char	*gr_name;
	char	*gr_passwd;
	int	gr_gid;
	char	**gr_mem;
};
.fi
.RE
.PP
The members of this structure are:
.TP
gr\_name
The name of the group.
.br
.ns
.TP
gr\_passwd
The encrypted password of the group.
.br
.ns
.TP
gr\_gid
The numerical group-ID.
.br
.ns
.TP
gr\_mem
Null-terminated vector
of pointers to the individual
member names.
.PP
.I Getgrent
reads the next
line (opening the file if necessary);
.I setgrent
rewinds the file;
.I endgrent
closes it.
.PP
.I Getgrgid
and
.I getgrnam
search from the beginning until a matching
.I gid
or
.I name
is found
(or until EOF is encountered).
.SH FILES
/etc/group
.SH "SEE ALSO"
getlogin(3), getpwent(3), group(5)
.SH DIAGNOSTICS
A null pointer
(0) is returned on EOF or error.
.SH BUGS
All information
is contained in a static area
so it must be copied if it is
to be saved.