man3/getusershell.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  23 .\" References consulted:
  24 .\"     Linux libc source code
  25 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  26 .\"     386BSD man pages
  27 .\" Modified Sat Jul 24 19:17:53 1993 by Rik Faith (faith@cs.unc.edu)
  28 .TH GETUSERSHELL 3  1993-07-04 "BSD" "Linux Programmer's Manual"
  29 .SH NAME
  30 getusershell, setusershell, endusershell \- get legal user shells
  31 .SH SYNOPSIS
  32 .nf
  33 .B #include <unistd.h>
  34 .sp
  35 .B char *getusershell(void);
  36 .sp
  37 .B void setusershell(void);
  38 .sp
  39 .B void endusershell(void);
  40 .fi
  41 .SH DESCRIPTION
  42 The \fBgetusershell()\fP function returns the next line from the file
  43 \fI/etc/shells\fP, opening the file if necessary.  The line should contain
  44 the pathname of a valid user shell.  If \fI/etc/shells\fP does not exist or
  45 is unreadable, \fBgetusershell()\fP behaves as if  \fI/bin/sh\fP and
  46 \fI/bin/csh\fP were listed in the file.
  47 .PP
  48 The \fBsetusershell()\fP function rewinds \fI/etc/shells\fP.
  49 .PP
  50 The \fBendusershell()\fP function closes \fI/etc/shells\fP.
  51 .SH "RETURN VALUE"
  52 The \fBgetusershell()\fP function returns a NULL pointer on end-of-file.
  53 .SH FILES
  54 .nf
  55 /etc/shells
  56 .fi
  57 .SH "CONFORMING TO"
  58 4.3BSD
  59 .SH "SEE ALSO"
  60 .BR shells (5)