linux打开进程数测试

查看linux默认打开最大打开进程数

具体参考：https://www.jb51.net/article/143667.htm

#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#define MAXPROCESS 65535

#define SLEEPTIME 60

int main(int argc, char **argv) {

  pid_t pid;

  int count = 0;

  int maxprocess = MAXPROCESS;

  if (argc == 2) {

    maxprocess = atoi(argv[1]);

  }

  for (count = 0; count < maxprocess; count++) {

    pid = fork();

    if (pid < 0) {

      perror("fork error");

      exit(1);

    } else if (pid == 0) {

      printf("child %d start\n", count);

      sleep(SLEEPTIME);

      printf("child %d end\n", count);

      exit(0);

    }

    printf("parent:create %d child\n", count);

  }

  for (count = 0; count < MAXPROCESS; count++) {

    wait();

  }

  exit(0);

}