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#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <dirent.h>
static char * __check_dir_for_tty_match(char * dirname, struct stat *st)
{
DIR *fp;
struct stat dst;
struct dirent *d;
static char name[NAME_MAX];
fp = opendir(dirname);
if (fp == 0)
return 0;
strcpy(name, dirname);
strcat(name, "/");
while ((d = readdir(fp)) != 0) {
strcpy(name + strlen(dirname) + 1, d->d_name);
if (stat(name, &dst) == 0
&& st->st_dev == dst.st_dev && st->st_ino == dst.st_ino) {
closedir(fp);
return name;
}
}
closedir(fp);
return NULL;
}
/* This is a failly slow approach. We do a linear search through
* some directories looking for a match. Yes this is lame. But
* it should work, should be small, and will return names that match
* what is on disk.
*
* Another approach we could use would be to use the info in /proc/self/fd */
char *ttyname(fd)
int fd;
{
char *the_name = NULL;
struct stat st;
int noerr = errno;
if (fstat(fd, &st) < 0)
return 0;
if (!isatty(fd)) {
noerr = ENOTTY;
goto cool_found_it;
}
/* Lets try /dev/vc first (be devfs compatible) */
if ( (the_name=__check_dir_for_tty_match("/dev/vc", &st)))
goto cool_found_it;
/* Lets try /dev/tts next (be devfs compatible) */
if ( (the_name=__check_dir_for_tty_match("/dev/tts", &st)))
goto cool_found_it;
/* Lets try /dev/pts next */
if ( (the_name=__check_dir_for_tty_match("/dev/pts", &st)))
goto cool_found_it;
/* Lets try walking through /dev last */
if ( (the_name=__check_dir_for_tty_match("/dev", &st)))
goto cool_found_it;
cool_found_it:
__set_errno(noerr);
return the_name;
}
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