在父进程中生成两个子进程，read，write，读写10个随机数

#include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> int main() { pid_t child1, child2, pr; child1 = fork(); if (child1 == -1) { printf("Fork1 error\n"); } else if (child1 == 0)/*子进程1*/ { if (execl("./read", "read" ,NULL) < 0) { printf("Execl error\n"); } } else/*父进程*/ { child2 = fork(); if (child2 == -1) { printf("Fork2 error\n"); } else if (child2 == 0)/*子进程2*/ { if (execl("./write", "write" ,NULL) < 0) { printf("Execl error\n"); } } else { do { /*调用wait，父进程阻塞*/ pr = waitpid(-1, NULL,0); if (pr == 0) { printf("The child1 process has not exited\n"); sleep(1); } if (pc == 0) { printf("The child2 process has not exited\n"); sleep(1); } } while (pr == 0); if (pr == child1) { printf("All child processes have exited\n"); } else { printf("Some error occured.\n"); } } } }