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



NAME
       getusershell, setusershell, endusershell - get permitted user shells

SYNOPSIS
       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

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

       getusershell(), setusershell(), endusershell(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 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

CONFORMING TO
       4.3BSD.

SEE ALSO
       shells(5)

COLOPHON
       This  page  is  part of release 3.25 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                                                        2007-07-26                                            GETUSERSHELL(3)