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/*
* ttyname_r() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name
*
* $Id$
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <termios.h>
#include <unistd.h>
#include <paths.h>
#include <_syslist.h>
#include <errno.h>
#include "libio_.h"
int ttyname_r(
int fd,
char *name,
int namesize
)
{
struct stat sb;
struct termios tty;
struct dirent *dirp;
DIR *dp;
struct stat dsb;
char *rval;
/* Must be a terminal. */
if (tcgetattr (fd, &tty) < 0)
set_errno_and_return_minus_one(EBADF);
/* Must be a character device. */
if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode))
set_errno_and_return_minus_one(EBADF);
if ((dp = opendir (_PATH_DEV)) == NULL)
set_errno_and_return_minus_one(EBADF);
for (rval = NULL; (dirp = readdir (dp)) != NULL ;)
{
if (dirp->d_ino != sb.st_ino)
continue;
strcpy (name + sizeof (_PATH_DEV) - 1, dirp->d_name);
if (stat (name, &dsb) || sb.st_dev != dsb.st_dev ||
sb.st_ino != dsb.st_ino)
continue;
(void) closedir (dp);
rval = name;
break;
}
(void) closedir (dp);
return 0;
}
static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
/*
* ttyname() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name
*/
char *ttyname(
int fd
)
{
if ( !ttyname_r( fd, buf, sizeof(buf) ) )
return buf;
return NULL;
}
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