getusershell(3)            Library Functions Manual            getusershell(3)

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 (),         | Thread safety | MT-Unsafe |
       |endusershell ()                           |               |           |
       +------------------------------------------+---------------+-----------+
STANDARDS
       None.

HISTORY
       4.3BSD.

SEE ALSO
       shells(5)

Linux man-pages 6.7               2023-10-31                   getusershell(3)