ubase/libutil/tty.c

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