endusershell man page on Debian

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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 3.27 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)
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