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)

Information

Source
Linux kernel
OS/version
GNU
Source updated
March 15, 2016
Page created
February 9, 2018
Page generated
December 2, 2018