95 lines
1.5 KiB
C
95 lines
1.5 KiB
C
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// Test that fork fails gracefully.
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// Tiny executable so that the limit can be filling the proc table.
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#include "kernel/types.h"
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#include "kernel/stat.h"
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#include "user/user.h"
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// N should be set HIGHER than the limit!
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#define N 10000
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void
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print(const char *s)
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{
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write(1, s, strlen(s));
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}
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void printdec(unsigned int i) {
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if (i == 0) {
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print("0");
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return;
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}
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char foo[11];
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int idx = 10;
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while (i > 0) {
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idx--;
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foo[idx] = '0' + (i%10);
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i /= 10;
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}
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foo[10] = 0;
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print(foo+idx);
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}
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void
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forktest(void)
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{
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int n, pid;
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print("fork test\n");
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//print("testing printdec(12345)="); printdec(12345); print("\n");
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print("attempting to fork up to N="); printdec(N); print(" processes...\n");
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for(n=0; n<N; n++){
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pid = fork();
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if(pid < 0)
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break;
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if (pid == 0) {
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int i, j, ch, pr;
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pr = 7-(getpid() % 4);
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ch = '0'+pr;
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prio(getpid(), pr, 4);
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sleep(1);
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for (i = 0; i < 100; i++) {
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for (j = 0; j < 256; j++) {
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ch++;
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}
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char str[2];
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str[0] = (char)ch;
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str[1] = 0;
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print(str);
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}
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exit(0);
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}
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}
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print("forked "); printdec(n); print(" processes\n");
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if(n == N){
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print("fork claimed to work N times! forktest should be updated so N is greater than the kernel's NPROC!\n");
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exit(1);
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}
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for(; n > 0; n--){
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if(wait(0) < 0){
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print("wait stopped early\n");
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exit(1);
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}
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}
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if(wait(0) != -1){
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print("wait got too many\n");
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exit(1);
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}
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print("fork test OK\n");
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}
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int
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main(void)
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{
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forktest();
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exit(0);
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}
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