/* * IPC benchmark, * read and reply using pipes. * * Process forks and exchanges messages * over a pipe in a request-response fashion. */ main(argc, argv) char *argv[]; { char buf[512]; int fd[2], fd2[2], msgsize; register int i, iter; if (argc < 3) { printf("usage: %s iterations message-size\n", argv[0]); exit(1); } argc--, argv++; iter = atoi(*argv); argc--, argv++; msgsize = atoi(*argv); if (msgsize > sizeof (buf) || msgsize <= 0) { printf("%s: Bad message size.\n", *argv); exit(2); } if (pipe(fd) < 0) { perror("pipe"); exit(3); } if (pipe(fd2) < 0) { perror("pipe"); exit(3); } if (fork() == 0) for (i = 0; i < iter; i++) { read(fd[0], buf, msgsize); write(fd2[1], buf, msgsize); } else for (i = 0; i < iter; i++) { write(fd[1], buf, msgsize); read(fd2[0], buf, msgsize); } }