URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [posix-process-environment.html] - Rev 174
Compare with Previous | Blame | View Log
<!-- Copyright (C) 2003 Red Hat, Inc. -->
<!-- This material may be distributed only subject to the terms -->
<!-- and conditions set forth in the Open Publication License, v1.0 -->
<!-- or later (the latest version is presently available at -->
<!-- http://www.opencontent.org/openpub/). -->
<!-- Distribution of the work or derivative of the work in any -->
<!-- standard (paper) book form is prohibited unless prior -->
<!-- permission is obtained from the copyright holder. -->
<HTML
><HEAD
><TITLE
>Process Environment [POSIX Section 4]</TITLE
><meta name="MSSmartTagsPreventParsing" content="TRUE">
<META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="eCos Reference Manual"
HREF="ecos-ref.html"><LINK
REL="UP"
TITLE="POSIX Standard Support"
HREF="posix-standard-support.html"><LINK
REL="PREVIOUS"
TITLE="POSIX Standard Support"
HREF="posix-standard-support.html"><LINK
REL="NEXT"
TITLE="Files and Directories [POSIX Section 5]"
HREF="posix-files-and-directories.html"></HEAD
><BODY
CLASS="SECT1"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>eCos Reference Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="posix-standard-support.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 31. POSIX Standard Support</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="posix-files-and-directories.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="POSIX-PROCESS-ENVIRONMENT">Process Environment [POSIX Section 4]</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13011">Functions Implemented</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>int uname( struct utsname *name );
time_t time( time_t *tloc );
char *getenv( const char *name );
int isatty( int fd );
long sysconf( int name );</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13014">Functions Omitted</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>pid_t getpid( void );
pid_t getppid( void );
uid_t getuid( void );
uid_t geteuid( void );
gid_t getgid( void );
gid_t getegid( void );
int setuid( uid_t uid );
int setgid( gid_t gid );
int getgroups( int gidsetsize, gid_t grouplist[] );
char *getlogin( void );
int getlogin_r( char *name, size_t namesize );
pid_t getpgrp( void );
pid_t setsid( void );
int setpgid( pid_t pid, pid_t pgid );
char *ctermid( char *s);
char *ttyname( int fd ); // TBA
int ttyname_r( int fd, char *name, size_t namesize); // TBA
clock_t times( struct tms *buffer ); // TBA</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13017">Notes</H2
><P
></P
><UL
><LI
><P
>The fields of the <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>utsname</I
></SPAN
>
structure are initialized as follows:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
> sysname “eCos”
nodename “” (gethostname() is currently not available)
release Major version number of the kernel
version Minor version number of the kernel
machine “” (Requires some config tool changes)
</PRE
></TD
></TR
></TABLE
>
</P
><P
> The sizes of these strings are defined by
CYG_POSIX_UTSNAME_LENGTH and
CYG_POSIX_UTSNAME_NODENAME_LENGTH. The
latter defaults to the value of the former, but may also
be set independently to accommodate a longer node name.
</P
></LI
><LI
><P
> The <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>time()</I
></SPAN
> function is currently
implemented in the C library.
</P
></LI
><LI
><P
>A set of environment strings may be defined at configuration
time with the CYGDAT_LIBC_DEFAULT_ENVIRONMENT
option. The application may also define an environment by direct
assignment to the <SPAN
CLASS="strong"
><B
CLASS="EMPHASIS"
>environ</B
></SPAN
>
variable.
</P
></LI
><LI
><P
> At present <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>isatty()</I
></SPAN
> assumes that
any character device is a tty and that all other devices are not
ttys. Since the only kind of device that eCos currently supports
is serial character devices, this is an adequate
distinction.
</P
></LI
><LI
><P
> All system variables supported by sysconf will yield a
value. However, those that are irrelevant to eCos will
either return the default minimum defined in
<TT
CLASS="FILENAME"
><limits.h></TT
>,
or zero.
</P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="posix-standard-support.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ecos-ref.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="posix-files-and-directories.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>POSIX Standard Support</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="posix-standard-support.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Files and Directories [POSIX Section 5]</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>