linux 最大打开文件数配置值 有没有限制

#include<sys/resource.h>
#include<stdio.h>
#include<unistd.h>
 
int main(void)
{
    printf("%d\n",sysconf(_SC_OPEN_MAX));
    struct rlimit limit;
    if ( getrlimit(RLIMIT_NOFILE,&limit) <0)
    {
        fprintf(stderr,"getrlimit error");
        exit(1);
    }
    printf("soft NOFILE:%d\t,hard NOFILE:%d\n",limit.rlim_cur,limit.rlim_max);
 
    return 0;
}

[pyplus@pyplus Documents]$ ./a.out
1024
soft NOFILE:1024 ,hard NOFILE:4096