endusershell man page on BSDi

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GETUSERSHELL(3)		    BSD Programmer's Manual	       GETUSERSHELL(3)

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 a pointer to a legal user shell as
     defined by the system manager in the file /etc/shells. If /etc/shells is
     unreadable or does not exist, getusershell() behaves as if /bin/sh and
     /bin/csh were listed in the file.

     The getusershell() function reads the next line (opening the file if nec-
     essary); setusershell() rewinds the file; endusershell() closes it.

FILES
     /etc/shells

DIAGNOSTICS
     The routine getusershell() returns a null pointer (0) on EOF.

SEE ALSO
     shells(5)

HISTORY
     The getusershell() function appeared in 4.3BSD.

BUGS
     The getusershell() function leaves its result in an internal static ob-
     ject and returns a pointer to that object. Subsequent calls to
     getusershell() will modify the same object.

     The getusershell() function may not be safely called concurrently from
     multiple threads, e.g., the interfaces described by pthreads(3).

4.3 Berkeley Distribution	 June 4, 1993				     1
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