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).

CONFORMING TO¶

4.3BSD.

SEE ALSO¶

shells(5)

COLOPHON¶

This page is part of release 4.15 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/.