man:getusershell
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).
+--------------------------------+---------------+-----------+ |Interface | Attribute | Value | +--------------------------------+---------------+-----------+ |getusershell(), setusershell(), | Thread safety | MT-Unsafe | |endusershell() | | | +--------------------------------+---------------+-----------+
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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