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>Process Environment [POSIX Section 4]</TITLE
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NAME="POSIX-PROCESS-ENVIRONMENT">Process Environment [POSIX Section 4]</H1
><DIV
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><H2
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><A
NAME="AEN13011">Functions Implemented</H2
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>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
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NAME="AEN13014">Functions Omitted</H2
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>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
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><A
NAME="AEN13017">Notes</H2
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><LI
><P
>The fields of the <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>utsname</I
></SPAN
>
structure are initialized as follows:
<TABLE
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><TD
><PRE
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> 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.
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