The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group
A newer edition of this document exists here

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.

[XSI][Option Start]
void           endgrent(void);
struct group  *getgrent(void);
[Option End]
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 **);
[XSI][Option Start]
void           setgrent(void);
[Option End]


The following sections are informative.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<sys/types.h>

XSH endgrent, getgrgid, getgrnam

CHANGE HISTORY

First released in Issue 1.

Issue 5

The DESCRIPTION is updated for alignment with the POSIX Threads Extension.

Issue 6

The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:

Issue 7

SD5-XBD-ERN-56 is applied, adding a reference to <sys/types.h> for the size_t type.

POSIX.1-2008, Technical Corrigendum 1, XBD/TC1-2008/0049 [24] is applied.

End of informative text.

 

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