Add getty(8).
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1
utils/.gitignore
vendored
1
utils/.gitignore
vendored
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@ -21,6 +21,7 @@ expr
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false
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find
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getaddrinfo
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getty
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halt
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head
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help
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@ -93,6 +93,7 @@ uname.1 \
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SBINS=\
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chroot \
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getty \
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unmount \
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MANPAGES8=\
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114
utils/getty.c
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114
utils/getty.c
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@ -0,0 +1,114 @@
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/*
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* Copyright (c) 2023 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF7
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* getty.c
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* Initialize a terminal session.
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*/
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <brand.h>
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#include <err.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int main(int argc, char* argv[])
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{
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bool logo = true;
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struct winsize ws;
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ws.ws_row = 24;
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ws.ws_col = 80;
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int opt;
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while ( (opt = getopt(argc, argv, "h:lw:")) != -1 )
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{
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switch ( opt )
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{
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case 'l': logo = true; break;
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case 'h': ws.ws_row = atoi(optarg); break;
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case 'w': ws.ws_col = atoi(optarg); break;
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default: return 1;
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}
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}
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if ( argc - optind < 1 )
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errx(1, "Expected terminal path");
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if ( argc - optind < 2 )
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errx(1, "Expected program");
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const char* path = argv[optind + 0];
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int tty = open(path, O_RDWR);
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if ( tty < 0 )
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err(1, "%s", path);
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if ( !isatty(tty) )
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err(1, "%s", path);
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struct termios tio;
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if ( tcgetattr(tty, &tio) < 0 )
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err(1, "tcgetattr: %s", path);
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pid_t child_pid = fork();
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if ( child_pid < 0 )
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err(1, "fork");
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if ( child_pid )
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{
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int status;
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waitpid(child_pid, &status, 0);
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return WEXITSTATUS(status);
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}
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if ( setsid() < 0 )
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err(1, "setsid");
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if ( ioctl(tty, TIOCSCTTY) < 0 )
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err(1, "ioctl: TIOCSCTTY");
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if ( close(0) < 0 || close(1) < 0 || close(2) < 0 )
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err(1, "close");
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if ( dup2(tty, 0) != 0 ||
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dup2(tty, 1) != 1 ||
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dup2(tty, 2) != 2 )
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err(1, "dup");
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if ( closefrom(3) < 0 )
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err(1, "closefrom");
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tty = 0;
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if ( ioctl(tty, TIOCSWINSZ, &ws) < 0 )
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err(1, "TIOCSWINSZ");
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tio.c_cflag |= CREAD;
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if ( tcsetattr(tty, TCSANOW, &tio) < 0 )
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err(1, "tcsetattr: %s", path);
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if ( logo )
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{
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printf("\e[37;41m\e[J");
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const char* string = BRAND_LOGO;
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while ( *string )
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{
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size_t string_width = strcspn(string, "\n");
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size_t leading = string_width <= ws.ws_col ?
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(ws.ws_col - string_width) / 2 : 0;
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for ( size_t i = 0; i < leading; i++ )
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putchar(' ');
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fwrite(string, string_width, 1, stdout);
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string += string_width;
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if ( *string == '\n' )
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{
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string++;
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if ( !*string )
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printf("\e[m");
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putchar('\n');
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}
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}
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}
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execvp(argv[optind + 1], argv + optind + 1);
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err(1, "%s", argv[optind + 1]);
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}
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