82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
#include <stdint.h>
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#include "ece391support.h"
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#include "ece391syscall.h"
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#define BUFSIZE 1024
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static uint8_t charbuf;
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static volatile uint8_t* badbuf = 0;
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void segfault_sighandler (int signum);
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void alarm_sighandler (int signum);
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int main ()
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{
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int32_t cnt;
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uint8_t buf[BUFSIZE];
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if (0 != ece391_getargs (buf, BUFSIZE)) {
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ece391_fdputs (1, (uint8_t*)"could not read argument\n");
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return 3;
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}
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if (buf[0] == '1') {
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ece391_fdputs(1, (uint8_t*)"Installing signal handlers\n");
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ece391_set_handler(SEGFAULT, segfault_sighandler);
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ece391_set_handler(ALARM, alarm_sighandler);
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}
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ece391_fdputs (1, (uint8_t*)"Hi, what's your name? ");
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if (-1 == (cnt = ece391_read (0, buf, BUFSIZE-1))) {
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ece391_fdputs (1, (uint8_t*)"Can't read name from keyboard.\n");
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return 3;
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}
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(*badbuf) = 1;
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buf[cnt] = '\0';
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ece391_fdputs (1, (uint8_t*)"Hello, ");
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ece391_fdputs (1, buf);
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if (charbuf == 1) {
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ece391_fdputs(1, (uint8_t*)"success\n");
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} else {
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ece391_fdputs(1, (uint8_t*)"failure\n");
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}
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return 0;
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}
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void
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segfault_sighandler (int signum)
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{
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char buf;
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uint32_t* eax;
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ece391_fdputs(1, (uint8_t*)"Segfault signal handler called, signum: ");
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switch (signum) {
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case 0: ece391_fdputs(1, (uint8_t*)"0\n"); break;
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case 1: ece391_fdputs(1, (uint8_t*)"1\n"); break;
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case 2: ece391_fdputs(1, (uint8_t*)"2\n"); break;
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case 3: ece391_fdputs(1, (uint8_t*)"3\n"); break;
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default: ece391_fdputs(1, (uint8_t*)"invalid\n"); break;
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}
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ece391_fdputs(1, (uint8_t*)"Press enter to continue...\n");
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ece391_read(0, &buf, 1);
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badbuf = &charbuf;
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eax = (uint32_t*)(&signum + 7);
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*eax = (uint32_t)&charbuf;
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ece391_fdputs(1, (uint8_t*)"Signal handler returning\n");
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}
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void
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alarm_sighandler (int signum)
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{
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ece391_fdputs(1, (uint8_t*)"Alarm signal handler called, signum: ");
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switch (signum) {
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case 0: ece391_fdputs(1, (uint8_t*)"0\n"); break;
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case 1: ece391_fdputs(1, (uint8_t*)"1\n"); break;
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case 2: ece391_fdputs(1, (uint8_t*)"2\n"); break;
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case 3: ece391_fdputs(1, (uint8_t*)"3\n"); break;
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default: ece391_fdputs(1, (uint8_t*)"invalid\n"); break;
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}
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}
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