'\" et
.TH grp.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\"
.SH PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
.\"
.SH NAME
grp.h
\(em group structure
.SH SYNOPSIS
.LP
.nf
#include <grp.h>
.fi
.SH DESCRIPTION
The
.IR <grp.h> 
header shall declare the
.BR group
structure, which shall include the following members:
.sp
.RS 4
.nf

char   *gr_name \fRThe name of the group.\fR
gid_t   gr_gid  \fRNumerical group ID.\fR
char  **gr_mem  \fRPointer to a null-terminated array of character\fR
                \fRpointers to member names.\fR
.fi
.P
.RE
.P
The
.IR <grp.h> 
header shall define the
.BR gid_t
and
.BR size_t
types as described in
.IR <sys/types.h> .
.P
The following shall be declared as functions and may also be defined as
macros. Function prototypes shall be provided.
.sp
.RS 4
.nf

void           endgrent(void);
struct group  *getgrent(void);
struct group  *getgrgid(gid_t);
int            getgrgid_r(gid_t, struct group *, char *,
                   size_t, struct group **);
struct group  *getgrnam(const char *);
int            getgrnam_r(const char *, struct group *, char *,
                   size_t , struct group **);
void           setgrent(void);
.fi
.P
.RE
.LP
.IR "The following sections are informative."
.SH "APPLICATION USAGE"
None.
.SH RATIONALE
None.
.SH "FUTURE DIRECTIONS"
None.
.SH "SEE ALSO"
.IR "\fB<sys_types.h>\fP"
.P
The System Interfaces volume of POSIX.1\(hy2017,
.IR "\fIendgrent\fR\^(\|)",
.IR "\fIgetgrgid\fR\^(\|)",
.IR "\fIgetgrnam\fR\^(\|)"
.\"
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
.PP
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .