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Annotation of os2sdk/demos/examples/dynlink/dynlib.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * dynlib.c
                      3:  *
                      4:  *   Created 17 August 1987 by Kevin Ruddell for Microsoft Corp
                      5:  *
                      6:  * Dynamic link library demo module with non-shared data.
                      7:  *
                      8:  */
                      9: 
                     10: /*
                     11:  * NB - The variable _acrtused must be declared in one of the modules of the
                     12:  *     dll.  The C compiler generates this symbol as an extern to ensure
                     13:  *     that the runtime library startup module crt0 will be pulled in by the
                     14:  *     linker.  Declaring _acrtused will keep this unwanted code out.
                     15:  *
                     16:  * NB - To be made part of the named data segment, variables at the external
                     17:  *     level must be declared static or they must be initialized or both.
                     18:  *
                     19:  */
                     20: 
                     21: /*
                     22:  * NB - This version must be compiled with the -Asnu compiler option.
                     23:  *     s => short code pointers
                     24:  *     n => near data pointers
                     25:  *     u => upon function entry, DS is saved, then made to point to the named
                     26:  *          data segment.  DS is restored on exit from the function.
                     27:  *
                     28:  */
                     29: 
                     30: #include <doscalls.h>
                     31: 
                     32: int _acrtused=0;
                     33: unsigned id=0;             /* process-unique identifier                     */
                     34: unsigned far * pcount=0;    /* pointer to the shared process count          */
                     35: 
                     36: void far pascal            /* This routine is called during per-process     */
                     37: init_id(pc)                /* initialization to pass the pointer to the     */
                     38: unsigned far * pc;         /* shared count and to set the non-shared id.    */
                     39: {
                     40:     pcount = pc;
                     41:     id = *pc;
                     42: }
                     43: 
                     44: void far pascal            /* This routine is called by the process to show */
                     45: printdata()                /* on the screen the current values of the       */
                     46:                            /* non-shared id and the shared count.           */
                     47: {
                     48:     static char beg[]="I am number ";
                     49:     static char mid[]=".  There are ";
                     50:     static char end[]=" processes attached.\r";
                     51:     char c;
                     52:     int Written;
                     53: 
                     54:     DOSWRITE(1, beg, sizeof(beg)-1, &Written);
                     55:     c = id + '0';
                     56:     DOSWRITE(1, &c, sizeof(char), &Written);
                     57:     DOSWRITE(1, mid, sizeof(mid)-1, &Written);
                     58:     c = *pcount + '0';
                     59:     DOSWRITE(1, &c, sizeof(char), &Written);
                     60:     DOSWRITE(1, end, sizeof(end)-1, &Written);
                     61: }

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