GETGRENT(3C-SVR3)   RISC/os Reference Manual    GETGRENT(3C-SVR3)



NAME
     getgrent, getgrgid, getgrnam, setgrent, endgrent, fgetgrent
          - get group file entry

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

     struct group *getgrent ( )

     struct group *getgrgid (gid)
     int gid;

     struct group *getgrnam (name)
     char *name;

     void setgrent ( )

     void endgrent ( )

     struct group *fgetgrent (f)
     FILE *f;

DESCRIPTION
     getgrent, getgrgid and getgrnam each return pointers to an
     object with the following structure containing the broken-
     out fields of a line in the /etc/group file.  Each line con-
     tains a ``group'' structure, defined in the <grp.h> header
     file.

          struct  group {         char         *gr_name;/* the
          name of the group */         char         *gr_passwd;/*
          the encrypted group password */
                  int          gr_gid;/* the numerical group ID
          */         char         **gr_mem;/* vector of pointers
          to member names */ };

     getgrent when first called returns a pointer to the first
     group structure in the file; thereafter, it returns a
     pointer to the next group structure in the file; so, succes-
     sive calls may be used to search the entire file.  getgrgid
     searches from the beginning of the file until a numerical
     group id matching gid is found and returns a pointer to the
     particular structure in which it was found.  getgrnam
     searches from the beginning of the file until a group name
     matching name is found and returns a pointer to the particu-
     lar structure in which it was found.  If an end-of-file or
     an error is encountered on reading, these functions return a
     NULL pointer.

     A call to setgrent has the effect of rewinding the group
     file to allow repeated searches.  endgrent may be called to



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GETGRENT(3C-SVR3)   RISC/os Reference Manual    GETGRENT(3C-SVR3)



     close the group file when processing is complete.

     fgetgrent returns a pointer to the next group structure in
     the stream f, which matches the format of /etc/group.

FILES
     /etc/group

SEE ALSO
     getlogin(3C), getpwent(3C), group(4).

DIAGNOSTICS
     A NULL pointer is returned on EOF or error.

WARNING
     The above routines use <stdio.h>, which causes them to
     increase the size of programs, not otherwise using standard
     I/O, more than might be expected.

CAVEAT
     All information is contained in a static area, so it must be
     copied if it is to be saved.

































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