grp.h - Man Page

group structure


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.


#include <grp.h>


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




Future Directions


See Also


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

Referenced By

endgrent(3p), getgrgid(3p), getgrnam(3p).

2017 IEEE/The Open Group POSIX Programmer's Manual