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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():

    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

CONFORMING TO

4.3BSD.

SEE ALSO

shells(5)

COLOPHON

This page is part of release 5.03 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/.
2016-03-15 GNU