setusershell(3) -- Linux man page
NAME
getusershell, setusershell, endusershell - get legal user shells
SYNOPSIS
#include <unistd.h>
char *getusershell(void);
void setusershell(void);
void endusershell(void);
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
BSD 4.3
SEE ALSO
shells(5)
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