setusershell(3)

NAME#

getusershell, setusershell, endusershell - get permitted user shells

LIBRARY#

Standard C library (libc, -lc)

SYNOPSIS#

#include <unistd.h>

char *getusershell(void);\n
\nvoid setusershell(void);\n
\nvoid endusershell(void);

getusershell(), setusershell(), endusershell():

\n
    Since glibc 2.21:
\n
        _DEFAULT_SOURCE
\n
    In glibc 2.19 and 2.20:
\n
        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
\n
    Up to and including glibc 2.19:
\n
        _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).

STANDARDS#

None.

HISTORY#

4.3BSD.

SEE ALSO#

shells(5)