user/forktest.c - xv6-riscv Source

1// Test that fork fails gracefully.2// Tiny executable so that the limit can be filling the proc table.34#include "kernel/types.h"5#include "kernel/stat.h"6#include "user/user.h"78#define N  1000910void11print(const char *s)12{13  write(1, s, strlen(s));14}1516void17forktest(void)18{19  int n, pid;2021  print("fork test\n");2223  for(n=0; n<N; n++){24    pid = fork();25    if(pid < 0)26      break;27    if(pid == 0)28      exit(0);29  }3031  if(n == N){32    print("fork claimed to work N times!\n");33    exit(1);34  }3536  for(; n > 0; n--){37    if(wait(0) < 0){38      print("wait stopped early\n");39      exit(1);40    }41  }4243  if(wait(0) != -1){44    print("wait got too many\n");45    exit(1);46  }4748  print("fork test OK\n");49}5051int52main(void)53{54  forktest();55  exit(0);56}57