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GETGRENT   (3) manpage
GETGRENT
3
1993-04-04
Linux Programmer's Manual
  • 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
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