81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
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/* See LICENSE file for copyright and license details. */
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s [tty] [term]\n", argv0);
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}
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static char *tty = "/dev/tty1";
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static char *defaultterm = "TERM=linux";
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int
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main(int argc, char *argv[])
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{
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int fd;
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struct sigaction sa;
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char term[128];
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ARGBEGIN {
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default:
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usage();
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} ARGEND;
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if (argc > 2)
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usage();
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strlcpy(term, defaultterm, sizeof(term));
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if (argc > 0) {
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tty = argv[0];
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if (argc > 1) {
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strlcpy(term, "TERM=", sizeof(term));
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strlcat(term, argv[1], sizeof(term));
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}
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}
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGHUP, &sa, NULL);
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putenv(term);
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setsid();
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fd = open(tty, O_RDWR);
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if (fd < 0)
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eprintf("open %s:", tty);
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if (isatty(fd) == 0)
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eprintf("%s is not a tty\n", tty);
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if (ioctl(fd, TIOCSCTTY, (void *)1) == 0) {
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if (vhangup() < 0)
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eprintf("vhangup:");
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} else {
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fprintf(stderr, "could not set controlling tty\n");
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}
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close(fd);
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fd = open(tty, O_RDWR);
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if (fd < 0)
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eprintf("open %s:", tty);
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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sa.sa_handler = SIG_DFL;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGHUP, &sa, NULL);
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putchar('\n');
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return execvp("/bin/login", (char *[]){ "login", NULL });
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}
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