fork

pcntl_fork() returning, Fatal error: Call to undefined function pcntl_fork()

由 谁都会走 提交于 2019-12-08 15:46:26
问题 I'm trying to fork a command line run XAMPP php process using pcntl_fork(). When I run the command below: $pid = pcntl_fork(); if($pid == -1){ file_put_contents('testlog.log',"\r\nFork Test",FILE_APPEND); return 1; //error } else if($pid){ return 0; //success } else{ file_put_contents($log, 'Running...', FILE_APPEND); } I get: Fatal error: Call to undefined function pcntl_fork() Can anyone suggest how to fix this? 回答1: It is not possible to use the function 'pcntl_fork' when PHP is used as

阿里云服务器安装mongodb

由 放肆的年华 提交于 2019-12-08 14:25:31
1.下载mongodb curl -O https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.2.9.tgz 2.解压 tar zxvf mongodb-linux-x86_64-3.2.9.tgz 3.创建数据文件夹和日志文件等 mkdir -p /usr/local/mongodb/data touch /usr/local/mongodb/mongod.log touch /usr/local/mongodb/mongodb.conf 4.启动 　进入mongo的bin目录下执行 （1）参数启动 ./mongod --dbpath=/usr/local/mongodb/data --logpath=/usr/local/mongodb/mongod.log --logappend --port=27017 --fork 　(2) 配置文件启动 ./mongod --config /usr/local/mongodb/mongodb.conf 配置文件如下 dbpath=/usr/local/mongodb/data logpath=/usr/local/mongodb/mongod.log logappend = true port = 27017 fork = true # 是否后台运行 auth = true #

fork() returns 0, but the child process getpid()!=0. Why?

由 吃可爱长大的小学妹 提交于 2019-12-08 14:20:37
问题 This is the C code to test fork() system call: #include<stdio.h> #include<stdlib.h> #include<sys/types.h> #include<unistd.h> #include<wait.h> int main(int argc, char *argv[]) { printf("I am: %d\n", (int)getpid()); pid_t pid = fork(); printf("fork returned: %d\n", (int)pid); if (pid < 0) { perror("fork failed"); } if (pid==0) { printf("I am the child with pid %d\n", (int)getpid()); sleep(5); printf("Child exiting...\n"); exit(0); } printf("I am the parent with pid %d, waiting for the child\n",

Using fork() with VS 2013 and Cygwin

由 北城以北 提交于 2019-12-08 13:15:18
问题 I am trying to write a C program that will use fork() and wait() in Visual Studio 2013. I have downloaded and installed Cygwin, but I am unable to configure Visual Studio to use the appropriate header files. I'm fairly new to the IDE and I was wondering if this community could help me figure out where I am making a mistake. When starting a new project, this is what I do: Create new Visual C++ Win32 Console Application Add new main.c source file to the project Right-click project properties

fork() and parent/child process ids

由 ∥☆過路亽．° 提交于 2019-12-08 12:30:55
问题 I am a bit confused about why the child process in the following two programs is showing different parents ids. First program: int main ( void ) { int pid, fpid, ppid; fpid = fork (); pid = getpid(); ppid = getppid(); printf ("fpid is %d\n", fpid); sleep(5); if (fpid > 0){ printf ("\nThis is Parent. My pid %d. My parent's pid %d\n",pid,ppid); } else if (fpid ==0){ sleep(1); printf ("\nThis is Child. My pid %d. My parent's pid %d\n",pid,ppid); } else printf ("fork failed\n"); return (0); }

C: dup2() before execv

由 若如初见. 提交于 2019-12-08 11:53:57
问题 For a homework assignment I have to write a basic shell including redirection. The program uses readline to prompt for input, parses the input string, and breaks it down into the executable name, the arguments, and the input/output file(s), if applicable. After parsing the string, it forks and the child execv()'s to the executable that was passed in. I'm using dup2() to change the file descriptors after the fork and before the execv, but am having a problem once the program has execv'd to the

In what manner, fork() system call making child process?

由 青春壹個敷衍的年華 提交于 2019-12-08 10:15:30
问题 Here is my code for fork() system call, #include<stdio.h> #include<stdlib.h> #include<sys/types.h> #include<sys/stat.h> #include<unistd.h> #include<errno.h> int main(int argc, char *argv[]) { pid_t pid; pid=fork(); printf("1st Fork\n"); printf("Process ID : %d, Parent Process ID : %d\n",getpid(),getppid()); pid=fork(); printf("2nd Fork\n"); printf("Process ID : %d, Parent Process ID : %d\n",getpid(),getppid()); pid=fork(); printf("3rd Fork\n"); printf("Process ID : %d, Parent Process ID : %d

How to wait for the children processes to send signals?

由 痴心易碎 提交于 2019-12-08 08:59:24
问题 #include <stdlib.h> #include <stdio.h> #include <signal.h> #include <sys/types.h> void handler(int signumber) { return; } int main() { int i, pid; int children_count = 5; int arr_childprocesses[5]; int parent_pid = getpid(); for(i=0;i<children_count;i++) { pid = fork(); if(pid == -1) { perror("Err"); exit(EXIT_FAILURE); } if(pid == 0) break; arr_childprocesses[i] = pid; } if (pid == 0) // children { kill(parent_pid,SIGUSR1); printf("Child(%d) sig sent. Waiting 5s...\n",getpid()); sleep(5);

How do I change the remote source of my github repo?

由 吃可爱长大的小学妹 提交于 2019-12-08 08:37:21
问题 I forked a repo and set everything up on my local machine. However, when I do 'git remote -v' it shows the original repo as my fetch and push source. I want it to by from my forked repo. How do I change it over to that without starting all over? And then, how do I add an upstream to the original repo? 回答1: From the git remote man page: git remote set-url origin https://github.com/user/forkname git remote add upstream https://github.com/maintainer/reponame See also the examples of GitHub:

Handling SIGCHLD will return EOF to the father, why?

由 岁酱吖の 提交于 2019-12-08 08:08:21
问题 I have a small shell that creates children (with fork()) and make them execute some commands with execvp. It support also the & option so the father can run other commands in the meanwhile. When a child die i want to write that on the console and also the child pid, so i defined a sighandler for SIGCHLD: void backdeadchild(int sig) { int pid, exitstat; pid = wait(&exitstat); printf("Child with pid: %d died", pid); } The problem is that after the handler prints the message also the father
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