标签：one tom red sock 文件 turn 14. soc 退出
www.zhaoch.top > 操作系统 > linux
虽然目前分布式架构和keepalived等工具的存在，对于某些特殊的程序，仍然需要不停服更新二进制文件。 这里参考nginx的实现介绍下如何实现这个功能的
参考
ngx_exec_new_binary
编辑app_new.cpp 与 app_old.cpp两个文件，app_old.cpp内容如下
#include <stdlib.h> #include <iostream> #include <fcntl.h> #include <errno.h> #include <unistd.h> #include <signal.h> #include <sys/types.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netinet/in.h> using namespace std; extern char **environ; // difference form old and new in binary file const char *TITLE = "APP-OLD "; bool g_update = false; bool g_stop = false; void signal_handler(int sig) { cout << "signal_handler" << sig << endl; if (sig == SIGUSR2) { g_update = true; } g_stop = true; } void update_binary(char* argv[], int fd) { if (fork() != 0) { return; } char *fdstr = new char[100]; snprintf(fdstr, 100, "FD=%d", fd); int n; for (n = 0; environ[n]; n++); // copy environ char **env = new char*[n + 1]; for (int i = 0; i < n - 1; i++) { env[i] = environ[i]; } // app fd into environ env[n - 1] = fdstr; env[n] = NULL; // importent exec app_new execvpe("./app_new", argv, env); } int main(int argc, char* argv[]) { int fd = -1; g_stop = false; g_update = false; cout << TITLE << getpid() << endl; char *oldfd = getenv("FD"); if (oldfd) { fd = atoi(oldfd); } else { struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(9999); addr.sin_addr.s_addr = inet_addr("127.0.0.1"); fd = socket(AF_INET, SOCK_STREAM|SOCK_NONBLOCK, 0); if (fd < 0) { return 1; } if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0 || listen(fd, 4096) < 0) { close(fd); return 1; } if (signal(SIGUSR2, signal_handler) == SIG_ERR || signal(SIGTERM, signal_handler) == SIG_ERR || signal(SIGINT, signal_handler) == SIG_ERR) { close(fd); return 1; } } while (!g_stop) { cout << TITLE << getpid() << " fd=" << fd << endl; sleep(1); } if (g_update) { update_binary(argv, fd); } // semulate waiting for the all connection diedown for (int i = 0; i < 10; i++) { cout << TITLE << getpid() << " fd=" << fd << endl; sleep(1); } cout << TITLE << "end" << endl; return 0; } app_new.cpp仅仅TITLE取名不同，用于区分新旧二进制文件
diff app_old.cpp app_new.cpp < const char *TITLE = "APP-OLD "; --- > const char *TITLE = "APP-NEW "; 编译两个文件用于对比测试
g++ app_old.cpp -o app_old g++ app_new.cpp -o app_new 执行结果
./app_old APP-OLD 8521 APP-OLD 8521 fd=3 APP-OLD 8521 fd=3 APP-OLD 8521 fd=3 signal_handler12 <- 执行命令 kill -USR2 8521 APP-OLD 8521 fd=3 <- 新旧并行 APP-NEW 8524 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD 8521 fd=3 APP-NEW 8524 fd=3 APP-OLD end <- 旧进程退出，只剩新进程 APP-NEW 8524 fd=3 APP-NEW 8524 fd=3 APP-NEW 8524 fd=3 APP-NEW 8524 fd=3 APP-NEW 8524 fd=3 APP-NEW 8524 fd=3
标签：one tom red sock 文件 turn 14. soc 退出
原文地址：https://www.cnblogs.com/GhostZCH/p/9637106.html
