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466
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1 <refentry id="os9">
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2 <refnamediv>
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468
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3 <refname>_os9</refname>
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4 <refpurpose>system call interface from C programs</refpurpose>
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466
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5 </refnamediv>
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6
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7 <refsynopsisdiv>
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8 <funcsynopsis>
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468
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9 <funcsynopsisinfo>
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10 #include <os9.h>
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11 </funcsynopsisinfo>
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466
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12 <funcprototype>
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468
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13 <funcdef><function>_os9</function></funcdef>
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572
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14 <paramdef>char <parameter>code</parameter></paramdef>
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15 <paramdef>struct registers *<parameter>reg</parameter></paramdef>
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466
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16 </funcprototype>
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17 </funcsynopsis>
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18
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19 </refsynopsisdiv>
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20
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21 <refsect1><title>Description</title>
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22 <para>
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23 Placeholder
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24 </para>
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25 </refsect1>
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534
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26
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27 <refsect1><title>Diagnostics</title>
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28 <para>
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29 -1 is returned is the OS-9 call failed. 0 is returned on success.
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30 </para>
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31 </refsect1>
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32
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33 <refsect1><title>Program Example</title>
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34 <programlisting>
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35 #include <os9.h>
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36 #include <modes.h>
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37
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38 /* this program does an I$GETSTT call to get file size */
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39 main(argc,argv)
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40 int argc;
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41 char **argv;
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42 {
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43 struct registers reg;
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44 int path;
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45
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46 /* tell linker we need longs */
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47 pflinit();
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48
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49 /* low level open(file name is first command line param */
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50 path=open(*++argv,S_IREAD);
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51
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52 /* set up regs for call to OS-9 */
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53 reg.rg_a=path;
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54 reg.rg_b=SS_SIZE;
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55
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56 if(_os9(I_GETSTT,&reg) == 0)
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57 printf("filesize = %lx\n", /* success */
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58 (long) (reg.rg_x << 16)+reg.rg_u);
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59 else printf("OS9 error #%d\n",reg.rg_b & 0xff); /*failed*/
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60
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61 dumpregs(&reg); /* take a look at the registers */
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62 }
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63
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64 dumpregs(r)
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65 register struct registers *r;
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66 {
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67 printf("cc=%02x\n",r->rg_cc & 0xff);
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68 printf(" a=%02x\n",r->rg_a & 0xff);
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69 printf(" b=%02x\n",r->rg_b & 0xff);
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70 printf("dp=%02x\n",r->rg_dp & 0xff);
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71 printf(" x=%02x\n",r->rg_x);
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72 printf(" y=%02x\n",r->rg_u);
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73 printf(" u=%02x\n",r->rg_y);
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74 }
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75 </programlisting>
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76 </refsect1>
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466
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77 </refentry>
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