grp.h(0P)		   POSIX Programmer's Manual		     grp.h(0P)

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.

NAME
       grp.h — group structure

SYNOPSIS
       #include <grp.h>

DESCRIPTION
       The <grp.h> header shall declare the group structure, which shall
       include the following members:


	   char	  *gr_name The name of the group.
	   gid_t   gr_gid  Numerical group ID.
	   char	 **gr_mem  Pointer to a null-terminated array of character
			   pointers to member names.

       The <grp.h> header shall define the gid_t and size_t types as described
       in <sys/types.h>.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.


	   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);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <sys_types.h>

       The System Interfaces volume of POSIX.1‐2017, endgrent(), getgrgid(),
       getgrnam()

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 .

       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 .

IEEE/The Open Group		     2017			     grp.h(0P)