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| -rw-r--r-- | askfirst.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/askfirst.c b/askfirst.c new file mode 100644 index 0000000..2f948f8 --- /dev/null +++ b/askfirst.c @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org> + * Copyright (C) 2013 John Crispin <blogic@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <sys/types.h> +#include <sys/stat.h> + +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> + +static int redirect_output(const char *dev) +{ + pid_t p = setsid(); + int fd; + + chdir("/dev"); + fd = open(dev, O_RDWR); + chdir("/"); + + if (fd < 0) + return -1; + + close(STDIN_FILENO); + close(STDOUT_FILENO); + close(STDERR_FILENO); + + dup2(fd, STDIN_FILENO); + dup2(fd, STDOUT_FILENO); + dup2(fd, STDERR_FILENO); + tcsetpgrp(fd, p); + close(fd); + + return 0; +} + +int main(int argc, char **argv) +{ + if (redirect_output(argv[1])) + fprintf(stderr, "%s: Failed to open %s\n", argv[0], argv[1]); + + printf("Please press Enter to activate this console.\n"); + while (getchar() != 0xA) + ; + execvp(argv[2], &argv[2]); + printf("%s: Failed to execute %s\n", argv[0], argv[2]); + + return -1; +} |