Topic       : TOS - The Operating System
Author      : 
Version     : tos.hyp (December 19, 2008)
Subject     : Programmieren/Atari
Nodes       : 3010
Index Size  : 93790
HCP-Version : 5
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : Title
@help       : 
@options    : +g -i -s +x +zz -t4
@width      : 70
View Ref-File5.21.23  Process Descriptor (PD) resp. BASEPAGE                    TOS

typedef struct pd
{
   VOID     *p_lowtpa;      /* Start address of the TPA            */
   VOID     *p_hitpa;       /* First byte after the end of the TPA */
   VOID     *p_tbase;       /* Start address of the program code   */
   int32_t   p_tlen;        /* Length of the program code          */
   VOID     *p_dbase;       /* Start address of the DATA segment   */
   int32_t   p_dlen;        /* Length of the DATA section          */
   VOID     *p_bbase;       /* Start address of the BSS segment    */
   int32_t   p_blen;        /* Length of the BSS section           */
   DTA      *p_dta;         /* Pointer to the default DTA          */
                            /* Warning: Points first to the        */
                            /* command line !                      */
   struct pd *p_parent;     /* Pointer to the basepage of the      */
                            /* calling processes                   */
   int32_t   p_resrvd0;     /* Reserved                            */
   int8_t   *p_env;         /* Address of the environment string   */
   int8_t    p_resrvd1[80]; /* Reserved                            */
   int8_t    p_cmdlin[128]; /* Command line                        */
} PD; /* also: BASEPAGE */

Note about the command line: The number of characters is inserted in 
the first line. The maximum length of the command line does not amount 
to 127, but only to 124 characters! (This does not apply in MagiC as 
of Version 3 - see ARGV procedure).

See also: GEMDOS   OSHEADER   Pexec   Program launch and TPA