在类Unix操作系统里面,.dup2和dup都通过系统调用来产生一份file descriptor 的拷贝. dup对我来说还很简单 int dup(int filedes); dup2就有点犯迷糊了 int dup2(int filedes1,int filedes2); 其实这样declaration更好 int dup2(int oldfd,int newfd) 下面是apue给出的解释 With dup2, we specify the value of
windows下打开命令窗口,安装pm2:npm install pm2 -g pm2成功安装,在项目目录下用pm2启动服务:pm2 start index.js,结果启动失败,错误如下: .pm2\pm2.log last 15 lines:PM2 | 2018-11-13T12:57:17: PM2 log: App [index:0] exited with code [1] via signal [SIGINT]\index.js had too many unstable restar
poll同select,用于监控file descriptor事件,推荐用poll的升级版epool来实现功能,但在简单应用中使用poll更方便. #include <poll.h> int poll(struct pollfd *fds, nfds_t nfds, int timeout); struct pollfd { int fd; short events; short revents; }; fds是文件描述符集的数组,nfds指定数组元素个数. pollfd中fd是打开文件的文件
今天安装了uwsgi+supervisord+nginx,一直访问不了 直接启动uwsgi使用nginx访问,查看有大量报错:epoll_ctl(): Bad file descriptor [core/event.c line 521] 查看strace和lsof也没有头绪,仔细看报错有epoll_create(): Too many open files [core/event.c line 504] 可能是进程数太多了超过文件句柄数,把uwsgi进程数改小后就可以了,待会改一下文件句柄数也
movie.mpeg.001 movie.mpeg.002 movie.mpeg.003 ... movie.mpeg.099 $cat movie.mpeg.0*>movie.mpeg Examples: cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. Shell 输入/输出重定向 https://ip
System-wide File Descriptor Limit Get current value: sysctl fs.file-max modify max fd limit: sysctl -w fs.file-max=10000 User File Descriptor Limit Get current value: ulimit -n modify max fd limit: ulimit -n 10000 use ulimit -a to print all limits of