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/* * shell-on -- 指定したttyでシェルを起動する * * 0.0: May 5, 2014 by Dai ISHIJIMA * * usage: * shell-on tty [command [args]...] * * see also: * /usr/src/usr.sbin/sysinstall/system.c */ #include #include #include #include #include #include /* login_tty(3), -lutil */ #include #include int main(int argc, char *argv[]) { int pid; char *tty; int fd; int i; char *prog; char *shell; char **args; prog = argv[0]; if (argc <= 1) { fprintf(stderr, "Usage: %s tty [command [arg]...]\n", prog); exit(1); } tty = argv[1]; if ((fd = open(tty, O_RDWR)) < 0) { fprintf(stderr, "%s: can't open %s\n", prog, tty); exit(1); } close(fd); args = (char **)calloc(argc, sizeof(char *)); if (argc <= 2) { /* オプションなし→シェル */ shell = "sh"; args[0] = "-sh"; args[1] = NULL; } else { shell = argv[2]; for (i = 0; i < argc - 2; i++) { args[i] = argv[2 + i]; } args[i] = NULL; } #ifdef EBUG fprintf(stderr, "%s: tty = %s, shell = %s\n", prog, tty, shell); i = 0; while (args[i] != NULL) { fprintf(stderr, "%s\n", args[i]); ++i; } #endif if ((pid = fork()) == 0) { /* 子供 */ int cfd; int fd; struct termios t; ioctl(0, TIOCNOTTY, NULL); for (cfd = 0; cfd < getdtablesize(); cfd++) { close(cfd); } if ((fd = open(tty, O_RDWR)) < 0) { exit(1); } ioctl(0, TIOCSCTTY, &fd); dup2(0, 1); dup2(0, 2); if (login_tty(fd) < 0) { exit(1); } signal(SIGTTOU, SIG_IGN); if (tcgetattr(fd, &t) < 0) { fprintf(stderr, "unable to get terminal attributes\n"); } else { t.c_cc[VERASE] = '\010'; if (tcsetattr(fd, TCSANOW, &t) < 0) { fprintf(stderr, "unable to set terminal attributes\n"); } } execvp(shell, args); fprintf(stderr, "unable to execute sh\n"); exit(1); } exit(0); } /* Local Variables: */ /* compile-command:"cc -Wall -o shell-on shell-on.c -lutil" */ /* End: */