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Annotation of coherent/b/kernel/tools/setfpe.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * setfpe - turn 80x87 support on/off
                      3:  *
                      4:  * All this program really does is tell the kernel to set or
                      5:  * clear bit 2 of cr0.
                      6:  *
                      7:  * Usage:  setfpe {off|on}
                      8:  *
                      9:  * When "off", floating poing instructions will cause trap #7 (DNA),
                     10:  * with signal 8 (SIGFPE).
                     11:  */
                     12: #include <stdio.h>
                     13: #include <sys/param.h>
                     14: 
                     15: char * cmd;
                     16: 
                     17: main(argc, argv)
                     18: int argc;
                     19: char ** argv;
                     20: {
                     21:        int a2, res;
                     22: 
                     23:        cmd = argv[0];
                     24:        if (argc != 2)
                     25:                usage();
                     26:        if (strcmp(argv[1], "on") == 0)
                     27:                a2 = 1;
                     28:        else if (strcmp(argv[1], "off") == 0)
                     29:                a2 = 0;
                     30:        else
                     31:                usage();
                     32:        res = cohcall(COH_SETFPE, a2);
                     33:        if (res == -1)
                     34:                perror("setfpe");
                     35: }
                     36: 
                     37: usage()
                     38: {
                     39:        fprintf(stderr, "Usage: %s {off|on}\n", cmd);
                     40:        exit(1);
                     41: }

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