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forktest.c
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forktest.c
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// Test that fork fails gracefully.
// Tiny executable so that the limit can be filling the proc table.
#include "types.h"
#include "stat.h"
#include "user.h"
#define N 1000
void printf(int fd, const char *s, ...) {
write(fd, s, strlen(s));
}
void forktest(void) {
int n, pid;
printf(1, "fork test\n");
for (n = 0; n < N; n++) {
pid = fork();
if (pid < 0) {
break;
}
if (pid == 0) {
exit();
}
}
if (n == N) {
printf(1, "fork claimed to work N times!\n", N);
exit();
}
for (; n > 0; n--) {
if (wait() < 0) {
printf(1, "wait stopped early\n");
exit();
}
}
if (wait() != -1) {
printf(1, "wait got too many\n");
exit();
}
printf(1, "fork test OK\n");
}
int main(void) {
forktest();
exit();
}