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| -rw-r--r-- | getty.c | 100 |
1 files changed, 100 insertions, 0 deletions
@@ -0,0 +1,100 @@ +/* + * UNG's Not GNU + * + * Copyright (c) 2020 Jakob Kaivo <jkk@ung.org> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#define _POSIX_C_SOURCE 200809L +#include <fcntl.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#ifndef DEFAULT_GETTY_COMMAND +#define DEFAULT_GETTY_COMMAND "/sys/bin/login" +#endif + +#ifndef DEFAULT_GETTY_DEVICE +#define DEFAULT_GETTY_DEVICE "/dev/console" +#endif + +#ifndef DEFAULT_GETTY_TYPE +#define DEFAULT_GETTY_TYPE "ecma-48" +#endif + +int main(int argc, char *argv[]) +{ + + char *command = DEFAULT_GETTY_COMMAND; + char *device = DEFAULT_GETTY_DEVICE; + char *type = DEFAULT_GETTY_TYPE; + + int c; + while ((c = getopt(argc, argv, "e:d:T:")) != -1) { + switch (c) { + case 'e': + command = optarg; + break; + + case 'd': + device = optarg; + break; + + case 'T': + type = optarg; + break; + + default: + return 1; + } + } + + if (argc > optind) { + fprintf(stderr, "getty: unexepcted operands\n"); + return 1; + } + + int fd = open(device, O_RDWR, 0600); + if (fd == -1) { + fprintf(stderr, "getty: %s: %s\n", device, strerror(errno)); + return 1; + } + + if (!isatty(fd)) { + fprintf(stderr, "getty: %s: %s\n", device, strerror(errno)); + return 1; + } + + close(STDIN_FILENO); + close(STDOUT_FILENO); + close(STDERR_FILENO); + dup2(fd, STDIN_FILENO); + dup2(fd, STDOUT_FILENO); + dup2(fd, STDERR_FILENO); + close(fd); + + setenv("TERM", type, 1); + /* TODO: wordexp() + execv() */ + execl("/bin/sh", "/bin/sh", "-c", command, (char*)NULL); + return 1; +} |