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Manual Reference Pages  - GETGRENT (3)

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getgrent, setgrent, endgrent - get group file entry

CONTENTS

Synopsis
Description
Errors
Files

#include <sys/types.h> 

#include <grp.h> 



struct group *getgrent(void); 



void setgrent(void); 



void endgrent(void); 

The getgrent() function returns a pointer to a structure containing the group information from /etc/group. The first time it is called it returns the first entry; thereafter, it returns successive entries.

The setgrent() function rewinds the file pointer to the beginning of the /etc/group file.

The endgrent() function closes the /etc/group file.

The group structure is defined in <grp.h> as follows:

struct group {
        char    *gr_name;        /* group name */
        char    *gr_passwd;      /* group password */
        gid_t   gr_gid;          /* group id */
        char    **gr_mem;        /* group members */
};

The getgrent() function returns the group information structure, or NULL if there are no more entries or an error occurs.

Upon error, errno may be set. If you want to check its value, set it to zero before the call.

EINTR	A signal was caught.
EIO	I/O error.
EMFILE	The calling process already has too many open files.
ENFILE	Too many open files in the system.
ENOMEM	Insufficient memory to allocate group information structure.

/etc/group
	group database file

SVID 3, BSD 4.3, POSIX 1003.1-2003.

fgetgrent(3), getgrent_r(3), getgrgid(3), getgrnam(3),

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