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man:setusershell

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():
         Since glibc 2.21:
             _DEFAULT_SOURCE
         In glibc 2.19 and 2.20:
             _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
         Up to and including glibc 2.19:
             _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 NULL on end-of-file.

FILES

     /etc/shells

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     allbox; lbw31 lb lb  l  l  l.   Interface Attribute Value  T{  getuser-
     shell(), setusershell(),
     endusershell() T}   Thread safety  MT-Unsafe

CONFORMING TO

     4.3BSD.

SEE ALSO

     shells(5)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.

GNU 2016-03-15 GETUSERSHELL(3)

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