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<!-- 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 >
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