NAME

       getusershell, setusershell, endusershell - get permitted user shells

LIBRARY

       Standard C library (libc, -lc)

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).

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

STANDARDS

       None.

HISTORY

       4.3BSD.

SEE ALSO

       shells(5)