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+'\" 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 .