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Annotation of os2sdk/demos/examples/infoseg/infoseg.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Example of DOSGETINFOSEG usage
                      3:  *
                      4:  * Gets the local and global data segments and displays some of their contents
                      5:  *
                      6:  * Copyright (C) Microsoft Corp. 1986
                      7:  */
                      8: 
                      9: #include "doscalls.h"
                     10: 
                     11: struct gdtinfoarea{
                     12:         unsigned long   time;
                     13:         unsigned long   milliseconds;
                     14:         unsigned char   hours;
                     15:         unsigned char   minutes;
                     16:         unsigned char   seconds;
                     17:         unsigned char   hundreths;
                     18:         unsigned        timezone;
                     19:         unsigned        timer_interval;
                     20:         unsigned char   day;
                     21:         unsigned char   month;
                     22:         unsigned        year;
                     23:         unsigned char   day_of_week;
                     24:         unsigned char   major_version;
                     25:         unsigned char   minor_version;
                     26:         unsigned char   revision_number;
                     27:         unsigned char   current_screen_group;
                     28:         unsigned char   max_num_of_screengrps;  
                     29:         unsigned char   huge_selector_shift_count;
                     30:         unsigned char   protect_mode_indicator;
                     31:        unsigned        foreground_process_id;
                     32:         unsigned char   dynamic_variation_flag;
                     33:         unsigned char   maxwait;
                     34:         unsigned        minimum_timeslice;
                     35:         unsigned        maximum_timeslice;
                     36:        unsigned        boot_drive;
                     37:        unsigned char   reserved[32];
                     38:  };
                     39: 
                     40: 
                     41:  struct ldtinfoarea{
                     42:         unsigned        current_process_pid;
                     43:         unsigned        parent_pid;
                     44:         unsigned        priority_of_current_thread;
                     45:         unsigned        thread_id_of_current_thread;
                     46:         unsigned        screen_group;
                     47:         unsigned        subscreen_group;
                     48:         unsigned        current_process_is_in_fg;
                     49:  };
                     50: 
                     51: main()
                     52: {
                     53:        struct gdtinfoarea *gdt;
                     54:        struct ldtinfoarea *ldt;
                     55:        unsigned gdt_handle, ldt_handle;
                     56:        
                     57:        /* get the infoseg handles */
                     58:        DOSGETINFOSEG(&gdt_handle, &ldt_handle);
                     59:        
                     60:        /* convert the handles into far pointers */
                     61:        gdt = (struct gdtinfoarea *)((long)gdt_handle << 16);
                     62:        ldt = (struct ldtinfoarea *)((long)ldt_handle << 16);
                     63:        
                     64:        /* display the contents of the segments */
                     65:        printf("This is thread %u of process %u\n",
                     66:                ldt->thread_id_of_current_thread,
                     67:                ldt->current_process_pid);
                     68:        printf("The current time is %u:%2u:%2u.%2u\n",
                     69:                gdt->hours, gdt->minutes, gdt->seconds, gdt->hundreths);
                     70: }

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