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.\" Copyright (c) 2016 Mariusz Zaborski <oshogbo@FreeBSD.org>
.\" All rights reserved.
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.Dd October 21, 2016
.Dt CAPSICUM_HELPERS 3
.Os
.Sh NAME
.Nm caph_limit_stream ,
.Nm caph_limit_stdin ,
.Nm caph_limit_stderr ,
.Nm caph_limit_stdout ,
.Nm caph_limit_stdio ,
.Nm caph_cache_tzdata ,
.Nm caph_cache_catpages
.Nd "set of the functions , part of the libcapsicum"
.Sh LIBRARY
.Lb libcapsicum
.Sh SYNOPSIS
.In capsicum_helpers.h
.Ft int
.Fn caph_limit_stream "int fd, int flags"
.Ft int
.Fn caph_limit_stdin "void"
.Ft int
.Fn caph_limit_stderr "void"
.Ft int
.Fn caph_limit_stdout "void"
.Ft int
.Fn caph_limit_stdio "void"
.Ft void
.Fn caph_cache_tzdata "void"
.Ft void
.Fn caph_cache_catpages "void"
.Sh DESCRIPTION
The
.Nm capsicum helpers
are a set of a inline functions which simplify modifying programs to use
Capsicum.
The goal is to reduce duplicated code patterns.
The
.Nm capsicum helpers
are part of
.Nm libcapsicum
but there is no need to link to the library.
.Pp
.Fn caph_limit_stream
restricts capabilities on
.Fa fd
to only those needed by POSIX stream objects (that is, FILEs).
.Pp
These flags can be provided:
.Pp
.Bl -tag -width "CAPH_IGNORE_EBADF" -compact -offset indent
.It Dv CAPH_IGNORE_EBADF
Do not return an error if file descriptor is invalid.
.It Dv CAPH_READ
Set CAP_READ on limited descriptor.
.It Dv CAPH_WRITE
Set CAP_WRITE on limited descriptor.
.El
.Pp
.Fn caph_limit_stdin ,
.Fn caph_limit_stderr
and
.Fn caph_limit_stdout
limit standard descriptors using the
.Nm caph_limit_stream
function.
.Pp
.Fn caph_limit_stdio
limits stdin, stderr and stdout.
.Pp
.Fn caph_cache_tzdata
precaches all timezone data needed to use
.Li libc
local time functions.
.Pp
.Fn caph_cache_catpages
caches Native Language Support (NLS) data.
NLS data is used for localized error printing by
.Xr strerror 3
and
.Xr err 3 ,
among others.
.Ed
.Sh SEE ALSO
.Xr cap_enter 2 ,
.Xr rights 4