user/logstress.c - xv6-riscv Source

1#include "kernel/types.h"2#include "kernel/stat.h"3#include "kernel/fcntl.h"4#include "user/user.h"56// Stress xv6 logging system by having several processes writing7// concurrently to their own file (e.g., logstress f1 f2 f3 f4)89#define BUFSZ 5001011char buf[BUFSZ];1213int14main(int argc, char **argv)15{16  int fd, n;17  enum { N = 250, SZ=2000 };18  19  for (int i = 1; i < argc; i++){20    int pid1 = fork();21    if(pid1 < 0){22      printf("%s: fork failed\n", argv[0]);23      exit(1);24    }25    if(pid1 == 0) {26      fd = open(argv[i], O_CREATE | O_RDWR);27      if(fd < 0){28        printf("%s: create %s failed\n", argv[0], argv[i]);29        exit(1);30      }31      memset(buf, '0'+i, SZ);32      for(i = 0; i < N; i++){33        if((n = write(fd, buf, SZ)) != SZ){34          printf("write failed %d\n", n);35          exit(1);36        }37      }38      exit(0);39    }40  }41  int xstatus;42  for(int i = 1; i < argc; i++){43    wait(&xstatus);44    if(xstatus != 0)45      exit(xstatus);46  }47  return 0;48}49