GETGRENT(3)                         Linux Programmer's Manual                         GETGRENT(3)



NAME
       getgrent, setgrent, endgrent - get group file entry

SYNOPSIS
       #include <sys/types.h>
       #include <grp.h>

       struct group *getgrent(void);

       void setgrent(void);

       void endgrent(void);

DESCRIPTION
       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 */
              };

RETURN VALUE
       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.

ERRORS
       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.

FILES
       /etc/group
               group database file

CONFORMING TO
       SVID 3, BSD 4.3, POSIX 1003.1-2003.

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



                                            1993-04-04                                GETGRENT(3)