endusershell3
Get permitted user shells
Part of getusershell(3).
Usage
#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)
Library
Standard C library (libc, -lc)
Overview
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 |
Releases
19 releases since Debian 1.1 (Buzz); the text changed 13 times.