endusershell(3) Linux Man Page

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). allbox; lbx lb lb T{ getusershell()setusershell()endusershell()

Interface	Attribute	Value
T}	Thread safety	MT-Unsafe

Standards

None.

History

4.3BSD.

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