man/, share/mk/: Move man*/ to man/

[thirdparty/man-pages.git] / man3 / getusershell.3

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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 19:17:53 1993 by Rik Faith (faith@cs.unc.edu)
-.TH getusershell 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-getusershell, setusershell, endusershell \- get permitted user shells
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.B char *getusershell(void);
-.B void setusershell(void);
-.B void endusershell(void);
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getusershell (),
-.BR setusershell (),
-.BR endusershell ():
-.nf
-    Since glibc 2.21:
-.\"             commit 266865c0e7b79d4196e2cc393693463f03c90bd8
-        _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)
-.fi
-.SH DESCRIPTION
-The
-.BR getusershell ()
-function returns the next line from the file
-.IR /etc/shells ,
-opening the file if necessary.
-The line should contain
-the pathname of a valid user shell.
-If
-.I /etc/shells
-does not exist or
-is unreadable,
-.BR getusershell ()
-behaves as if
-.I /bin/sh
-and
-.I /bin/csh
-were listed in the file.
-.P
-The
-.BR setusershell ()
-function rewinds
-.IR /etc/shells .
-.P
-The
-.BR endusershell ()
-function closes
-.IR /etc/shells .
-.SH RETURN VALUE
-The
-.BR getusershell ()
-function returns NULL on end-of-file.
-.SH FILES
-.I /etc/shells
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.na
-.nh
-.BR getusershell (),
-.BR setusershell (),
-.BR endusershell ()
-T}     Thread safety   MT-Unsafe
-.TE
-.SH STANDARDS
-None.
-.SH HISTORY
-4.3BSD.
-.SH SEE ALSO
-.BR shells (5)