write() writes up to count bytes from the buffer pointed buf to the file referred to by the file descriptor fd. 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. example The following example illustrates the use of waitpid to wait for a process to end: #include #include #include #include #include #include int main(void) { int i, status; pid_t childID, endID; time_t when; if ((childID = fork()) == -1) { /* Start a child process.

1.2절. On error, -1 is returned. By default, waitpid() waits only for terminated children, but this behavior is modifiable via the options argument, as described below.

By default, waitpid() waits only for terminated children, but this behavior is modifiable via the options argument, as described below. write(2) - Linux man page Name write - write to a file descriptor Synopsis #include ssize_t write(int fd, const void *buf, size_t count); Description. man waitpid (2): Данные системные вызовы используются для ожидания изменения состояния процесса-потомка вызвавшего процесса и получения информации о потомке, чьё состояние изменилось. 설명. The value of pid can be: < -1 . waitpid 함수는 인수로 주어진 pid 번호의 자식프로세스가 종료되거나, 시그널 함수를 호출하는 신호가 전달될때까지 waitpid 호출한 영역에서 일시 중지 된다. The value of pid can be: < -1 waitpid() システムコールは、 pid 引き数で指定した子プロセスの状態変化が起こるまで、 呼び出し元のプロセスの実行を一時停止する。 デフォルトでは、 waitpid () は子プロセスの終了だけを待つが、この動作は options 引き数により変更可能である。 waitpid(-1, &status, 0); The waitpid() system call suspends execution of the calling process until a child specified by pid argument has changed state. The waitpid() system call suspends execution of the calling thread until a child specified by pid argument has changed state. waitpid(): on success, returns the process ID of the child whose state has changed; if WNOHANG was specified and one or more child(ren) specified by pid exist, but have not yet changed state, then 0 is returned. As a result, if one of the children blocks or delays for any reason, and some other child which was created later has already finished (and called exit() ), the latter will remain in a zombie state, until the parent reaps the former child first.

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