125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 1988, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "namespace.h"
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/filio.h>
|
|
#include <fcntl.h>
|
|
#include <dirent.h>
|
|
#include <stdlib.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <paths.h>
|
|
#include <errno.h>
|
|
#include "reentrant.h"
|
|
#include "un-namespace.h"
|
|
|
|
#include "libc_private.h"
|
|
|
|
static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN];
|
|
|
|
static once_t ttyname_init_once = ONCE_INITIALIZER;
|
|
static thread_key_t ttyname_key;
|
|
static int ttyname_keycreated = 0;
|
|
|
|
int
|
|
ttyname_r(int fd, char *buf, size_t len)
|
|
{
|
|
struct stat sb;
|
|
struct fiodgname_arg fgn;
|
|
size_t used;
|
|
|
|
*buf = '\0';
|
|
|
|
/* Must be a terminal. */
|
|
if (!isatty(fd))
|
|
return (ENOTTY);
|
|
/* Must be a character device. */
|
|
if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
|
|
return (ENOTTY);
|
|
/* Must have enough room */
|
|
if (len <= sizeof(_PATH_DEV))
|
|
return (ERANGE);
|
|
|
|
strcpy(buf, _PATH_DEV);
|
|
used = strlen(buf);
|
|
fgn.len = len - used;
|
|
fgn.buf = buf + used;
|
|
if (!_ioctl(fd, FIODGNAME, &fgn))
|
|
return (0);
|
|
used = strlen(buf);
|
|
devname_r(sb.st_rdev, S_IFCHR, buf + used, len - used);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
ttyname_keycreate(void)
|
|
{
|
|
ttyname_keycreated = (thr_keycreate(&ttyname_key, free) == 0);
|
|
}
|
|
|
|
char *
|
|
ttyname(int fd)
|
|
{
|
|
char *buf;
|
|
|
|
if (thr_main() != 0)
|
|
buf = ttyname_buf;
|
|
else {
|
|
if (thr_once(&ttyname_init_once, ttyname_keycreate) != 0 ||
|
|
!ttyname_keycreated)
|
|
return (NULL);
|
|
if ((buf = thr_getspecific(ttyname_key)) == NULL) {
|
|
if ((buf = malloc(sizeof ttyname_buf)) == NULL)
|
|
return (NULL);
|
|
if (thr_setspecific(ttyname_key, buf) != 0) {
|
|
free(buf);
|
|
return (NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ttyname_r(fd, buf, sizeof ttyname_buf) != 0)
|
|
return (NULL);
|
|
return (buf);
|
|
}
|