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getusershell(3) Library Functions Manual getusershell(3)
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 at-
tributes(7).
+------------------------------------------+---------------+-----------+
|Interface | Attribute | Value |
+------------------------------------------+---------------+-----------+
|getusershell(), setusershell(), | Thread safety | MT-Unsafe |
|endusershell() | | |
+------------------------------------------+---------------+-----------+
STANDARDS
None.
HISTORY
4.3BSD.
SEE ALSO
shells(5)
Linux man-pages 6.04 2023-03-30 getusershell(3)
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