98 lines
1.7 KiB
C
98 lines
1.7 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <limits.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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#include "../util.h"
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void
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devtotty(int dev, int *tty_maj, int *tty_min)
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{
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*tty_maj = (dev >> 8) & 0xfff;
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*tty_min = (dev & 0xff) | ((dev >> 12) & 0xfff00);
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}
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int
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ttytostr(int tty_maj, int tty_min, char *str, size_t n)
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{
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struct stat sb;
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struct dirent *dp;
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DIR *dirp;
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char path[PATH_MAX];
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int fd;
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int r = 0;
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switch (tty_maj) {
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case 136:
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snprintf(str, n, "pts/%d", tty_min);
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return 0;
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case 4:
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snprintf(str, n, "tty%d", tty_min);
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return 0;
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default:
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str[0] = '?';
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str[1] = '\0';
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break;
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}
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dirp = opendir("/dev");
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if (!dirp) {
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weprintf("opendir /dev:");
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return -1;
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}
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while ((dp = readdir(dirp))) {
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if (!strcmp(dp->d_name, ".") ||
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!strcmp(dp->d_name, ".."))
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continue;
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if (strlcpy(path, "/dev/", sizeof(path)) >= sizeof(path)) {
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weprintf("path too long\n");
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r = -1;
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goto err0;
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}
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if (strlcat(path, dp->d_name, sizeof(path)) >= sizeof(path)) {
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weprintf("path too long\n");
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r = -1;
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goto err0;
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}
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if (stat(path, &sb) < 0) {
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weprintf("stat %s:", path);
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r = -1;
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goto err0;
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}
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if ((int)major(sb.st_rdev) == tty_maj &&
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(int)minor(sb.st_rdev) == tty_min) {
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fd = open(path, O_RDONLY | O_NONBLOCK);
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if (fd < 0)
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continue;
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if (isatty(fd)) {
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strlcpy(str, dp->d_name, n);
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close(fd);
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break;
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} else {
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close(fd);
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r = -1;
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goto err0;
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}
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}
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}
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err0:
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if (closedir(dirp) < 0) {
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weprintf("closedir /dev:");
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r = -1;
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}
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return r;
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}
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