fork | 易学教程

error C3861: '_tcsdup': identifier not found

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问题 This is my first time and I'd like to make a parallel process using the windows CreateProcess function. Based on the example at MSDN I created a LPTSTR "(non-const) TCHAR string" command line argument like this LPTSTR szCmdline[] = _tcsdup(TEXT("\C:\\MyProgram_linux_1.1\\MyProgram.exe") ); The LPTSTR and other char and string types are discussed here The command line argument is passed to CreateProcess like this if (!CreateProcess(NULL, szCmdline, /*...*/) ) cout << "ERROR: cannot start

child and parent process id

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问题 Just got confused with parent pid value in child process block. My program is given below: int main(int argc, char *argv[]) { pid_t pid; pid=fork(); if(pid==-1){ perror("fork failure"); exit(EXIT_FAILURE); } else if(pid==0){ printf("pid in child=%d and parent=%d\n",getpid(),getppid()); } else{ printf("pid in parent=%d and childid=%d\n",getpid(),pid); } exit(EXIT_SUCCESS); } Output: pid in parent=2642 and childid=2643 pid in child=2643 and parent=1 In "Advanced Unix programming" it says that

fork() - multiple processes and system calls

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问题 I am writing a mapreduce program that uses multiple I/O pipes (one pipe per process) to get some final results. I am having a problem with creating the processes. Specifically, I am getting the following error: wait error: Interrupted system call This is my code that spawns processes: while (values[inc]!=NULL) //provided array of text lines { if ((pid = fork()) == -1) { perror("fork error"); exit(EXIT_FAILURE); } else if (pid == 0) { /* start of child process */ printf("Child process...\n");

SIGCHLD not caught in epoll_wait?

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问题 I wanted to understand the behavior of signals on fork. I wrote a small program to catch SIGCHLD with epoll_wait but when I do a "kill -9" on the forked child, I am not getting any signal and the child is in defunct state (I have a handler that does a wait()). Here is the code. //.... sigemptyset(&mask); sigaddset(&mask, SIGCHLD); pthread_sigmask(SIG_BLOCK, &mask, NULL); signal_fd = signalfd(-1, &mask, 0); memset(&tev, 0, sizeof(tev)); tev.events = EPOLLIN | EPOLLONESHOT; tev.data.fd = signal

writing linux shell

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问题 I am trying to learn Unix C and doing some exercises for practice. I am currently working on writing my own shell that works similar to the linux bash shell. The code I have below provides for a fairly basic shell. It now provides I/O redirection. I am trying to add support for piping. Initially, I just want to add support for a single pipe. I have tried to go through some tutorials online but can't quite figure out where to start. Currently, the shell below can handle commands commands such

Why is output of parent process blocked by child process?

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问题 In my code below, I forked my process into a parent and child process. In the child process, I sent the c string argv[1] to the parent process to be printed. Then I made the child process sleep for 4 seconds before printing "This is the child process. Closing\n". In the parent process, I want the string from the child process to be printed to stdout as soon as I receive it from the child process. The problem arises here. Instead of immediately printing argv[1] in the parent process before the

springboot 热加载

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1、CTRL + SHIFT + A --> 查找make project automatically --> 选中 2、CTRL + SHIFT + A --> 查找Registry --> 找到并勾选compiler.automake.allow.when.app.running 3 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> 4 <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <fork>true</fork> </configuration> </plugin> </plugins> </build> 5、Chrome禁用缓存 F12（或Ctrl+Shift+J或Ctrl+Shift+I）--> NetWork --> Disable Cache(while DevTools is open) 来源： CSDN

Windows createprocess linux fork

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1 来源： https://www.cnblogs.com/yuanjiangw/p/12015019.html

Why does FT_Read() fail in the child process but work in the parent process?

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问题 I have the following program, which uses the ftd2xx library to write a byte to an USB device and then reads the reply. #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <stdarg.h> #include "../ftd2xx.h" void fatal (const char *format,...) { va_list argp; fprintf(stderr, "FATAL: "); va_start(argp, format); vfprintf(stderr, format, argp); va_end(argp); fprintf(stderr, "\n"); exit(3); } int main(int argc, char* argv[]) { int pid = fork(); if (pid > 0) { //replace with: if (pid

shared memory after exec()

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问题 How can I share memory between the parent and the child if the child has run exec() to load another program? Is it possible using mmap ? By now parent and child share memory properly using mmap, but not after exec is done 回答1: You can use shm_open to open a "named" shared memory block which is identified by a file on the filesystem. Example: In the parent: int memFd = shm_open("example_memory", O_CREAT | O_RDWR, S_IRWXU); if (memFd == -1) { perror("Can't open file"); return 1; } int res =