errno | 易学教程

python: can't open file in macbook terminal - [Errno 2]!

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问题 In my macbook air terminal I wrote python eggshell.py but I got this error python: can't open file 'eggshell.py': [Errno 2] No such file or directory s-user:/ user$ After I got that error I tried a number of things, like specifying exactly were eggshell.py is: python Users/myuser/Eggshell/eggshell.py Doing that just gave me a different Errno 2 error: OSError: [Errno 2] No such file or directory: 'modules/commands/macOS' If you have anything that can help me figure this out, I'd be incredibly

python: can't open file in macbook terminal - [Errno 2]!

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UNIX C send() errno 14

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问题 I have this code: void caller() { char buffer[20][20]; int sd; ... send(sd, buffer[7], 5, 0); } Now I have this code: void funct(int sd, char **buffer) { send(sd, buffer[7], 5, 0); } void caller() { char buffer[20][20]; int sd; ... funct(sd, buffer); } To simplify suppose that instead of ... I have an initialization of socket UDP and connection with the server to use send instead of sendto. I don't understand why the second code generates on send an error and errno is set with value 14, but

strtoll not setting errno to ERANGE upon overflow

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来源： https://stackoverflow.com/questions/63537391/strtoll-not-setting-errno-to-erange-upon-overflow

strtoll not setting errno to ERANGE upon overflow

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来源： https://stackoverflow.com/questions/63537391/strtoll-not-setting-errno-to-erange-upon-overflow

Errno 13 Permission Denied on mac

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问题 I am simply testing how to call external .py files from one .py file. I have 2 .py files, both in the same directory. Here is the code for the main one (runext.py suppose to call ext.py): import subprocess subprocess.call("/Users/training/PycharmProjects/MarcouFirstProject/ext.py") ext.py is just print("hey this actually worked") However, every time I run runext.py, I get this error message: Traceback (most recent call last): File "/Users/training/PycharmProjects/MarcouFirstProject/runext.py"

Python ConnectionRefusedError: [Errno 61] Connection refused

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问题 Ive seen similar questions but they I couldn't fix this error. Me and my friend are making a chat program but we keep getting the error ConnectionRefusedError: [Errno 61] Connection refused We are on different networks by the way. Here is my code for the server import socket def socket_create(): try: global host global port global s host = '' port = 9999 s = socket.socket() except socket.error as msg: print("Socket creation error" + str(msg)) #Wait for client, Connect socket and port def

为什么要同步

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8.1、为什么要同步线程之间是合作关系。既然是合作，那就要由某种约定的规则，否则合作就会出现问题。例子1 ：有两个线程同时运行，第一个线程在执行了一些操作后想检查当前的错误状态errno，但在其做检查之前，线程2却修改了errno。这样，当第一个线程再次获得控制权后，检查结果将是线程2改写过的errno，而这是不正确的。线程1 线程2 。。。。。。。。。读errno变量。。。。。。。。写errno变量从读操作返回。。。。检查errno值。。。。一个进程的两个线程因为操作不同步而造成线程1运行错误。之所以出现上述问题，是基于两个原因： l errno是线程之间共享的全局变量 l 线程之间的相对执行顺序是不确定的因此，要解决上述问题有两个办法，即分别消除上述两个原因。消除第1个原因的办法就是限制全局变量，给每个线程一个私有的errno变量。事实上，如果可以将所有的资源都私有化，让线程之间不共享，那么这种问题就不复存在。但问题是，如果所有资源都不共享，那么还有必要发明线程吗？甚至也没有必要发明进程了。因为这样就违背了进程和线程设计的初衷：共享资源、提高资源利用率。因此，这种解决办法是不切实际的。那剩下的办法就是消除第2个原因，即让线程之间的相对执行顺序在需要的时候可以确定。例子2 ：有两个线程A和B，分别执行指令x=1和x=2，即线程A：x=1；

linux网络编程常见socket错误分析

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3 月，跳不动了？>>> 常见socket错误码 EINTR: 阻塞的操作被取消阻塞的调用打断。如设置了发送接收超时，就会遇到这种错误。只能针对阻塞模式的socket。读，写阻塞的socket时，-1返回，错误号为INTR。另外，如果出现EINTR即errno为4，错误描述Interrupted system call，操作也应该继续。如果recv的返回值为0，那表明连接已经断开，接收操作也应该结束。 ETIMEOUT： 1、操作超时。一般设置了发送接收超时，遇到网络繁忙的情况，就会遇到这种错误。 2、服务器做了读数据做了超时限制，读时发生了超时。 3、错误被描述为“connect time out”，即“连接超时”，这种情况一般发生在服务器主机崩溃。此时客户 TCP 将在一定时间内（依具体实现）持续重发数据分节，试图从服务 TCP 获得一个 ACK 分节。当最终放弃尝试后（此时服务器未重新启动），内核将会向客户进程返回 ETIMEDOUT 错误。如果某个中间路由器判定该服务器主机已经不可达，则一般会响应“destination unreachable”－“目的地不可达”的ICMP消息，相应的客户进程返回的错误是 EHOSTUNREACH 或ENETUNREACH。当服务器重新启动后，由于 TCP 状态丢失，之前所有的连接信息也不存在了，此时对于客户端发来请求将回应 RST

socket example

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for code copy in the future simple server and client may be useful for copy in the future server: [cpp] view plain copy #include <errno.h> #include "sys/types.h" #include "sys/socket.h" #include "sys/stat.h" #include "unistd.h" #include <netinet/in.h> //#include <arpa/inet.h> #include <fcntl.h> #define SERVER_PORT (56738) #define SERVER_IP "127.0.0.1" #define LOG printf static void handle_crashing_process_new( int fd) { int n; unsigned int tid; int length = getpid(); int retry = 30; printf( "handle_crashing_process_new in\n" ); while ((n = read(fd, &tid, sizeof (unsigned))) != sizeof (unsigned