getusershell - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03
NAMEgetusershell, setusershell, endusershell − get permitted user shells
LIBRARYStandard 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)
DESCRIPTIONThe 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 VALUEThe getusershell() function returns NULL on end-of-file.
FILES/etc/shells
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue getusershell(), setusershell(), endusershell() Thread safetyMT-Unsafe
STANDARDS4.3BSD.
SEE ALSOshells(5) 0
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