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1 // Test that fork fails gracefully.
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2 // Tiny executable so that the limit can be filling the proc table.
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3
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4 #include "types.h"
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5 #include "stat.h"
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6 #include "user.h"
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7
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8 #define N 1000
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9
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10 void
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11 printf(int fd, char *s, ...)
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12 {
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13 write(fd, s, strlen(s));
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14 }
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15
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16 void
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17 forktest(void)
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18 {
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19 int n, pid;
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20
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21 printf(1, "fork test\n");
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22
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23 for(n=0; n<N; n++){
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24 pid = fork();
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25 if(pid < 0)
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26 {
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27 printf(1, "fork failed!\n");
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28 break;
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29 }
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30 if(pid == 0)
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31 exit();
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32 }
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33
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34 if(n == N){
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35 printf(1, "fork claimed to work N times!\n", N);
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36 exit();
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37 }
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38
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39 for(; n > 0; n--){
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40 if(wait() < 0){
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41 printf(1, "wait stopped early\n");
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42 exit();
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43 }
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44 }
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45
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46 if(wait() != -1){
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47 printf(1, "wait got too many\n");
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48 exit();
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49 }
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50
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51 printf(1, "fork test OK\n");
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52 }
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53
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54 int
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55 main(void)
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56 {
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57 forktest();
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58 exit();
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59 }
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