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annotate uprogs/forktest.c @ 0:c450faca55f4

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author Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
date Sun, 22 Oct 2017 18:25:39 +0900
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Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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1 // Test that fork fails gracefully.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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2 // Tiny executable so that the limit can be filling the proc table.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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3
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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4 #include "types.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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5 #include "stat.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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6 #include "user.h"
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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7
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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8 #define N 1000
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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9
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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10 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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11 printf(int fd, char *s, ...)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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12 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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13 write(fd, s, strlen(s));
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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14 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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15
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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16 void
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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17 forktest(void)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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18 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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19 int n, pid;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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20
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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21 printf(1, "fork test\n");
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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22
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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23 for(n=0; n<N; n++){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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24 pid = fork();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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25 if(pid < 0)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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26 break;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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27 if(pid == 0)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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28 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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29 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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30
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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31 if(n == N){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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32 printf(1, "fork claimed to work N times!\n", N);
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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33 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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34 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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35
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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36 for(; n > 0; n--){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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37 if(wait() < 0){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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38 printf(1, "wait stopped early\n");
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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39 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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40 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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41 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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42
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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43 if(wait() != -1){
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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44 printf(1, "wait got too many\n");
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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45 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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46 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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47
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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48 printf(1, "fork test OK\n");
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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49 }
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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50
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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51 int
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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52 main(void)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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53 {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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54 forktest();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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55 exit();
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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56 }