linux c fork waitpid
wait vs. waitpid. 之前解了一個bug，很要命的bug，東看西看了老半天也沒有端倪，先放一個sample，大家可以參考一下： switch (fork()) case -1: break; case 0: execl("/util/AAA", "/util/AAA", "-s", "OOXX", NULL); exit(1); default: wait(&status); if(WIFEXITED(, #include<unistd.h>. #include<sys/types.h>. #include<sys/wait.h>. int main(). /* 如果是子进程*//* 在这里等待*/ /* 如果是父进程*/. pc=fork();. if(pc==0) ..... 第一次fork后，p3224（父进程）的变量为i=0，fpid=3225（fork函数在父进程中返向子进程id），代码内容为：. ``` C++. for (int i=0;i<2;i+, Here's a demo of the easiest way to produce the output in the order you asked for. It uses 3 loops: one to create the child processes, one to wait for them and collect their exit statuses, and one to print the exit statuses. #include <stdio.h> , pid_t child_pid, wpid; int status = 0; //Father code (before child processes start) for (int id=0; id<n; id++) if ((child_pid = fork()) == 0) //child code exit(0); } } while ((wpid = wait(&status)) > 0); // this way, the father waits for all , Using: waitpid(pids[i], 0, 0);. you specify an exact order in which the parent will reap its children: it will be the same order as they were created. As a result, if one of the children blocks or delays for any reason, and some other child which was cre, It looks to me as though the basic problem is that you have one wait() call rather than a loop that waits until there are no more children. You also only wait if the last fork() is successful rather than if at least one fork() is successful. You should o, Here's a simple, readable solution: pid_t parent = getpid(); pid_t pid = fork(); if (pid == -1) // error, failed to fork() } else if (pid > 0) int status; waitpid(pid, &status, 0); } else // we are the child execve(...); _exit(EXIT_FAILURE), 1.pid_t fork(); (1)当一个进程调用了fork 以后,系统会创建一个子进程.这个子进程和父进程不同的地方只有他的进程ID 和父进程ID,其他的都是一样.就象符进 ...,原來，在linux裡面有提供wait()和waitpid()這兩個system call來解決這類的問題。 parent process可以先暫停，等到child process確定成功完成了，再繼續。 pid_t wait (int *status); wait() functino會先暫停目前所在的process，並且等待他所擁有的任何一個child process離開。該child process離開時的回傳值(不論是exit所傳的或是return ... , Linux允許用戶創建用戶進程的子進程，在C語言中通過pid_t fork(void);函數實現。fork函數的基本功能是生成一個子進程，並複製當前進程的數據段和堆棧段， ... Linux系統中init進程負責領養所有孤兒進程，也就是說，孤兒進程的父進程會被設爲init進程。init進程作爲系統守護進程(daemon process)，會不斷調用wait ...
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 linux c fork waitpid 相關參考資料
wait vs. waitpid | 菜鳥的三年成長史 - wirelessr - GitBook
wait vs. waitpid. 之前解了一個bug，很要命的bug，東看西看了老半天也沒有端倪，先放一個sample，大家可以參考一下： switch (fork()) case -1: break; case 0: execl("/util/AAA", "/util/AAA", "-s", "OOXX", NU... https://wirelessr.gitbooks.io linux的fork(),waitpid()及wait()的用法 - B0lv42
#include<unistd.h>. #include<sys/types.h>. #include<sys/wait.h>. int main(). /* 如果是子进程*//* 在这里等待*/ /* 如果是父进程*/. pc=fork();. if(pc==0) ..... 第一次fork后，p3224（父进程）的变量为i=0，fpid=3225（fork... https://b0lv42.github.io c - Linux fork() and wait() - Stack Overflow
Here's a demo of the easiest way to produce the output in the order you asked for. It uses 3 loops: one to create the child processes, one to wait for them and collect their exit statuses, and on... https://stackoverflow.com c - Make parent wait for all child processes - Stack Overflow
pid_t child_pid, wpid; int status = 0; //Father code (before child processes start) for (int id=0; id<n; id++) if ((child_pid = fork()) == 0) //child code exit(0); } } while ((wpid = wait(&s... https://stackoverflow.com linux - fork and waitpid in C - Stack Overflow
Using: waitpid(pids[i], 0, 0);. you specify an exact order in which the parent will reap its children: it will be the same order as they were created. As a result, if one of the children blocks or de... https://stackoverflow.com c - fork() and wait() with two child processes - Stack Overflow
It looks to me as though the basic problem is that you have one wait() call rather than a loop that waits until there are no more children. You also only wait if the last fork() is successful rather ... https://stackoverflow.com c - how to correctly use fork, exec, wait - Stack Overflow
Here's a simple, readable solution: pid_t parent = getpid(); pid_t pid = fork(); if (pid == -1) // error, failed to fork() } else if (pid > 0) int status; waitpid(pid, &status, 0); } els... https://stackoverflow.com linux c学习笔记----进程创建(fork,wait,waitpid) - 知知为知知- ITeye博客
1.pid_t fork(); (1)当一个进程调用了fork 以后,系统会创建一个子进程.这个子进程和父进程不同的地方只有他的进程ID 和父进程ID,其他的都是一样.就象符进 ... http://lobert.iteye.com Linux - wait(), waitpid() - 阿忠雜記 - yam 蕃薯藤
原來，在linux裡面有提供wait()和waitpid()這兩個system call來解決這類的問題。 parent process可以先暫停，等到child process確定成功完成了，再繼續。 pid_t wait (int *status); wait() functino會先暫停目前所在的process，並且等待他所擁有的任何一個child process離開。該child proc... https://albert43.tian.yam.com Linux C語言編程學習筆記(1)進程控制入門- BYVoid
Linux允許用戶創建用戶進程的子進程，在C語言中通過pid_t fork(void);函數實現。fork函數的基本功能是生成一個子進程，並複製當前進程的數據段和堆棧段， ... Linux系統中init進程負責領養所有孤兒進程，也就是說，孤兒進程的父進程會被設爲init進程。init進程作爲系統守護進程(daemon process)，會不斷調用wait ... https://www.byvoid.com |