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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():
_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
Multithreading (see pthreads(7))
The getusershell(), setusershell() and endusershell() functions are not thread-safe.
CONFORMING TO
4.3BSD.
SEE ALSO
shells(5)
COLOPHON
This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/.
GNU 2013-06-21 GETUSERSHELL(3)
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