GETUSERSHELL(3) Linux Programmer s Manual GETUSERSHELL(3)

NAME getusershell, setusershell, endusershell - get permitted user shells

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(): _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 a NULL pointer on end-of-file.

FILES /etc/shells

CONFORMING TO 4.3BSD.

SEE ALSO shells(5)

COLOPHON This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

GNU 2007-07-26 GETUSERSHELL(3)