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

NAME
       getusershell, setusershell, endusershell - get permitted user shells

SYNOPSIS
       #include 

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

   Feature Test Macro Requirements for glibc (see featuretestmacros(7)):

       getusershell(), setusershell(), endusershell():
           BSDSOURCE || (XOPENSOURCE && XOPENSOURCE < 500)

DESCRIPTION
       The  getusershell()  function  returns  the  next  line  from  the file
       /etc/shells, opening the file if necessary.  The  line  should  contain
       the  pathname  of a valid user shell.  If /etc/shells does not exist or
       is unreadable, getusershell() behaves as if /bin/sh and  /bin/csh  were
       listed in the file.

       The setusershell() function rewinds /etc/shells.

       The endusershell() function closes /etc/shells.

RETURN VALUE
       The getusershell() function returns a NULL pointer on end-of-file.

FILES
       /etc/shells

ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).

       ┌────────────────────────────────┬───────────────┬───────────┐
       │Interface                       │ Attribute     │ Value     │
       ├────────────────────────────────┼───────────────┼───────────┤
       │getusershell(), setusershell(), │ Thread safety │ MT-Unsafe │
       │endusershell()                  │               │           │
       └────────────────────────────────┴───────────────┴───────────┘
CONFORMING TO
       4.3BSD.

SEE ALSO
       shells(5)

COLOPHON
       This page is part of release 3.53 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



GNU                               2013-06-21                   GETUSERSHELL(3)